{"id":210769,"date":"2025-01-23T09:52:11","date_gmt":"2025-01-23T14:52:11","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=210769"},"modified":"2025-01-23T09:52:11","modified_gmt":"2025-01-23T14:52:11","slug":"efficient-shelf-angle-design-for-masonry-veneers","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/efficient-shelf-angle-design-for-masonry-veneers\/","title":{"rendered":"Reducing overdesign: The structural complexity of shelf angles"},"content":{"rendered":"<p><strong>By Mark D. Hagel, PhD, P.Eng.<\/strong><\/p>\n<figure id=\"attachment_210770\" aria-describedby=\"caption-attachment-210770\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210770 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt-500x334.jpg\" alt=\"A contemporary brick building featuring several storefronts and a greenery line along the sidewalk. Streetlights stand beside the entrance, and the setting sun casts a warm glow over the scene.\" width=\"500\" height=\"334\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt-500x334.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt-300x200.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt-768x513.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt.jpg 800w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210770\" class=\"wp-caption-text\"><em>Photo by Klassen Photography\/courtesy Jackson Masonry<\/em><\/figcaption><\/figure>\n<p>The invention of skeleton frame construction, which creates the building\u2019s primary load-bearing role using a concrete or steel frame \u201cskeleton,\u201d led to the removal of the load-bearing function of masonry in the late \u202819<sup>th<\/sup> century. The first building to use a steel-frame skeleton in North America was the Home Insurance Building in Chicago, completed in 1885. It is also considered the world\u2019s first skyscraper (Figure 1).<\/p>\n<figure id=\"attachment_210772\" aria-describedby=\"caption-attachment-210772\" style=\"width: 375px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210772 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-1-375x500.jpg\" alt=\"A historic black-and-white photograph showing a large multi-story building with ornate architectural details on its fa\u00e7ade. The building is located at a city intersection, surrounded by other tall structures, with early 20th-century automobiles parked along the street below. The image captures the bustling atmosphere of the urban environment during that era.\" width=\"375\" height=\"500\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-1-375x500.jpg 375w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-1-225x300.jpg 225w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-1.jpg 600w\" sizes=\"auto, (max-width: 375px) 100vw, 375px\" \/><\/a><figcaption id=\"caption-attachment-210772\" class=\"wp-caption-text\">Figure 1: Home Insurance Building in Chicago.1 See note 1.<\/figcaption><\/figure>\n<p>The removal of the load-bearing function of multiple wythes of masonry, as seen in Figure 2a, was accompanied by reducing the masonry to a single wythe of non-load-bearing veneer and a backup wall, as seen in Figure 2b, which required support of its weight using concrete brick ledges or steel shelf angles.<\/p>\n<figure id=\"attachment_210773\" aria-describedby=\"caption-attachment-210773\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-2a-and-2b.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210773 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-2a-and-2b-500x328.jpg\" alt=\"The image shows two wall types: on the left, a traditional brick wall with red bricks arranged in a staggered pattern. On the right, a layered wall system with an external brick facade, insulation, and metal framing that holds the layers together.\" width=\"500\" height=\"328\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-2a-and-2b-500x328.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-2a-and-2b-300x197.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-2a-and-2b.jpg 602w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210773\" class=\"wp-caption-text\">Figure 2a and 2b: 2a) Multi-wythe load-bearing brick wall (veneer and structure). 2b) Single-wythe brick veneer with steel stud load-bearing wall. <em>Illustrations and photos courtesy Alberta \u2028Masonry Council<\/em><\/figcaption><\/figure>\n<p>Shelf angle design represents the intersection of masonry design\u00a0and steel design, and depending on the building\u2019s primary structural system, concrete, steel, or wood design. Therefore, shelf angle design has often been regarded as a \u201csteel\u201d design or a \u201cconcrete\u201d design problem rather than a \u201cmasonry design\u201d problem. For this reason, very little literature has been published on shelf angle design.<\/p>\n<p>The design of steel shelf angles is not as simple and intuitive as it might first appear. Interactions between the tied masonry veneer and the steel angle and beam behavior from the brick veneer spanning between anchor bolts can be complex to capture with models simple enough for hand calculations. This often leads to oversizing shelf angles and the stand-offs for shelf angles when continuous insulation (c.i.) is used. Overdesign of these steel elements can lead to unnecessary increases in thermal bridging, carbon footprint, and cost of a masonry veneer. This article provides examples and discusses strategies for a more efficient design of steel shelf angles that support the weight of full-bed masonry veneers.<\/p>\n<h2><strong>Beam effect and restraining force <\/strong><strong>\u2028<\/strong><strong>of masonry ties<\/strong><\/h2>\n<p>The deep beam behavior (action) of the brick veneer spanning between anchor bolts is challenging to capture with simple models for hand calculations. As a result, the beam action of the brick veneer identified by McGinley<sup>2<\/sup> is often ignored when using a simplified hand calculation. The impacts of the masonry ties lead to a statically indeterminate problem and, as such, are frequently overlooked so the design can be reduced to a more easily solved statically determinate problem.<\/p>\n<p>Reviewing the definitions of statically determinate and statically indeterminate structures can help one better understand the problem\u2019s complexity. In 2D, there are three equations of equilibrium. Static equilibrium requires these equations to be\u00a0equal to zero; in other words, the external forces acting on the structure are resisted by equal and opposite reactions. If the equations were not equal to zero, the structure would move.<\/p>\n<p>A statically determinate structural condition occurs when three unknown reaction forces hold the structure in static equilibrium, and three equilibrium equations are used\u00a0to determine these forces. Simply put, three equations and three unknowns.<\/p>\n<p>In contrast, with a statically indeterminate structure, there are more reactions than equations of equilibrium. Since there are only three equilibrium equations in 2D, if there are four reactions on a structure, then there are four unknowns and only three equations, creating a statically indeterminate structure with one degree of static indeterminacy. If there were five reactions, the degree of static indeterminacy would be two and so on. Finding a solution for a statically indeterminate structure involves creating additional equations (or relationships) between the forces acting on the structure and the reactions. This is\u00a0often accomplished by examining the structural deflections\/displacements and internal forces within the structure.<\/p>\n<p>Now that the definitions have been reviewed, the brick veneer system, as illustrated in Figure 3, is typically reduced to a statically determinate structure, as seen in the free body diagram of the system in Figure 4. The simplification of the system by ignoring the restraining force of the ties results in only three unknowns, Tf, Vf, and Cf, which can be easily determined from the equations of equilibrium. However, this can lead to an overestimation of the forces acting on the anchor bolts and increased deflection of the shelf angle, resulting in an unnecessary increase in the size and cost of the shelf angle and an increase in the size and frequency of the anchor bolts. Technical aids that use the statically determinate method to design shelf angles already exist.<sup>3<\/sup> These technical aids conclude that to support the weight of 9 m (30 ft) of traditional 90 mm (3.5 in.) brick veneer, an L102 x 102 x 13 mm \u2028(L4 x 4 x 0.5 in.) steel shelf angle is required to meet the maximum deflection of 0.24 mm (0.009 in.) of the L\/480 recommended deflection limit. In addition to this, 16 mm (0.6 in.) diameter post-installed anchor bolts spaced at 305 mm (12 in.) on center horizontally would be required to meet the tension and shear forces on the anchor bolts resulting from the weight of the brick veneer.<\/p>\n<figure id=\"attachment_210774\" aria-describedby=\"caption-attachment-210774\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210774 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-3-500x271.jpg\" alt=\"A cross-section illustration of a wall assembly showing various construction materials. The left side features a 90 mm brick veneer with brick ties, a 25 mm airspace, exterior-grade OSB, and a 2x6 stud wall. It also includes a moisture barrier and gypsum board. The right side lists specifications, including a hot-dip galvanized shelf angle.\" width=\"500\" height=\"271\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-3-500x271.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-3-300x163.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-3-768x417.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-3.jpg 800w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210774\" class=\"wp-caption-text\">Figure 3: \u2028Brick veneer with wood stud backup foundation detail, 2D and 3D.<\/figcaption><\/figure>\n<figure id=\"attachment_210775\" aria-describedby=\"caption-attachment-210775\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-4.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210775 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-4-500x405.jpg\" alt=\"This technical drawing illustrates a cross-section of a structural connection. On the left, it shows pressure forces (Ps and Pf) applied vertically, along with a layered structural element. The right side features additional dimensions (L1, L2, etc.) and vertical force (Vf) markers, indicating various component measurements.\" width=\"500\" height=\"405\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-4-500x405.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-4-300x243.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-4-768x622.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-4.jpg 797w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210775\" class=\"wp-caption-text\">Figure 4: \u2028Free body diagram of shelf angle at the foundation\u2014statically determinate.<\/figcaption><\/figure>\n<p>On the other hand, based on field experience of buildings with brick veneers, shelf angles that are half that thickness have been observed to support \u20289 m (30 ft) of brick veneer without the cracking of mortar joints that can be indicative of excessive movement in brick veneers.<\/p>\n<p>Figure 5a illustrates the impact of both the beam effect and the restraining force of the ties on a brick veneer in situ. In Figure 5a, the approximately 20-ft (6-m) span of shelf angle supporting the veneer has fallen to the ground due to anchor bolt withdrawal on the 30-year-old brick veneer. A horizontal crack developing into step cracking (Figure 5b) has formed due to the absence of support for the weight of the veneer. However, the veneer remains attached to the wall, and no brick units have fallen to the ground. The combined action of the brick veneer appears to create deep beam behavior between the two remaining supports. At the same time, the masonry ties continue to laterally anchor the veneer to the wall.<\/p>\n<figure id=\"attachment_210776\" aria-describedby=\"caption-attachment-210776\" style=\"width: 375px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5a.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210776 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5a-375x500.jpg\" alt=\"A person in a gray sweater is climbing a brick wall of a building, positioned on the left side of the image. The wall is made of reddish-brown bricks and is surrounded by a green lawn and trees. In the background, there is a clear blue sky.\" width=\"375\" height=\"500\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5a-375x500.jpg 375w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5a-225x300.jpg 225w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5a.jpg 600w\" sizes=\"auto, (max-width: 375px) 100vw, 375px\" \/><\/a><figcaption id=\"caption-attachment-210776\" class=\"wp-caption-text\">Figure 5a and 5b:\u2028Failed shelf angle anchor bolts\u2014illustration of beam action and masonry tie impacts on \u2028brick veneers.<\/figcaption><\/figure>\n<figure id=\"attachment_210777\" aria-describedby=\"caption-attachment-210777\" style=\"width: 375px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5b.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210777 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5b-375x500.jpg\" alt=\"A brick wall displays a significant diagonal crack running from the bottom left to the upper right. The bricks are various shades of red and brown, with some mortar visible between them. The crack disrupts the pattern of the bricks, creating an uneven appearance. Below the wall, a metal structure and dirt can be seen, indicating potential issues with the foundation.\" width=\"375\" height=\"500\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5b-375x500.jpg 375w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5b-225x300.jpg 225w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-5b.jpg 600w\" sizes=\"auto, (max-width: 375px) 100vw, 375px\" \/><\/a><figcaption id=\"caption-attachment-210777\" class=\"wp-caption-text\">Figure 5b.<\/figcaption><\/figure>\n<p>A new design approach is proposed, which more accurately accounts for the interaction between the tied masonry veneer and the shelf angle. The proposed design method more accurately reflects field observations of masonry veneer where an \u2028L102 x 102 x 6.4 mm (L4 x 4 x 0.25 in.) can support 7 to 9 m (24 to 30 ft) of 90 mm (3.5 in.) clay brick veneer without evidence of structural distress in brick veneers from excessive deflection that is typically identified by mortar joint cracking. The \u201cas-built\u201d performance of masonry veneers in Figure 6 shows that the deflections and load distribution on a shelf angle are less than what is typically produced with current simplified, statically determinate shelf angle design methods.<\/p>\n<figure id=\"attachment_210778\" aria-describedby=\"caption-attachment-210778\" style=\"width: 375px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-6.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210778 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-6-375x500.jpg\" alt=\"A corner view of a three-story apartment building featuring a brick exterior. The building has several balconies with black railings on the second and third floors. Below the balconies, there is a small area of grass and a support pole in the foreground.\" width=\"375\" height=\"500\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-6-375x500.jpg 375w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-6-225x300.jpg 225w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-6.jpg 600w\" sizes=\"auto, (max-width: 375px) 100vw, 375px\" \/><\/a><figcaption id=\"caption-attachment-210778\" class=\"wp-caption-text\">Figure 6<\/figcaption><\/figure>\n<p>The proposed design method employs the use \u2028of the force method in combination with virtual work to solve the one-degree statically indeterminate system that results from the introduction of \u2028tie restraining force, R<sub>TIE<\/sub>, at the first course of ties \u2028as depicted in the free body diagram of the system in Figure 7.<\/p>\n<figure id=\"attachment_210779\" aria-describedby=\"caption-attachment-210779\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-7.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210779 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-7-500x364.jpg\" alt=\"A technical diagram depicting a construction detail with labeled elements, including forces (P_s, P_f), dimensions (L1 to L8), and connections. The diagram shows a cross-section of a wall and interacting elements, indicating the relationships between different parts of the structure.\" width=\"500\" height=\"364\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-7-500x364.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-7-300x219.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-7-768x560.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-7.jpg 800w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210779\" class=\"wp-caption-text\">Figure 7<\/figcaption><\/figure>\n<p>From Figure 8, the following parameters are required to use the force method and virtual work:<\/p>\n<p>P = Unfactored (service load) of masonry veneer and shelf angle (N) per meter<\/p>\n<p>= (20.8 kN\/m<sup>3<\/sup>) (9.144 m) (0.0921 m) (1 m) + 0.098kN\/m = 17,614 N (3,960 lbf)<\/p>\n<p>Pf = Factored load of masonry veneer and shelf angle (N) per meter<\/p>\n<p>= 1.4 (17,614 N) = 24,659 N (5,544 lbf)<\/p>\n<p>R<sub>TIE<\/sub> = Reaction force in the brick ties at the first course of ties (kN) per meter<\/p>\n<p>V = Reaction force in the brick ties at the first course of ties (kN) per meter<\/p>\n<p>T = Reaction force in the brick ties at the first course of ties (kN) per meter<\/p>\n<p>C = Reaction force in the brick ties at the first course of ties (kN) per meter<\/p>\n<p>L1 = Vertical leg length (mm)<\/p>\n<p>L2 = Horizontal leg length (mm)<\/p>\n<p>L3 = Vertical distance to the center of the bolt hole \u2028= 38 mm (1.4 in.)<\/p>\n<p>L4 = Centroid of brick veneer (typically 45 mm \u2028[1.6 in.] for metric modular 90 mm [3.5 mm] brick)<\/p>\n<p>L5 = Eccentricity of veneer load = Air space + (veneer thickness \/ 2) = (25.4 + 46.1)<\/p>\n<p>= 71.5 mm (2.8 in.)<\/p>\n<p>L6 = L1 \u2013 L3 (mm)<\/p>\n<p>L7 = Max 300 mm (11.8 in.) from base support (typically 272 mm [10 in.] + thickness of the shelf angle to meet the joints of the brick coursing)<\/p>\n<p>L8 = Vertical distance between the ties and the center of the bolt hole<\/p>\n<p>L9 = Total length of horizontal leg = Air space + veneer thickness = 25.4 + 92.1<\/p>\n<p>= 117.5 mm (4.6 in.)<\/p>\n<p>In addition to these dimensions, the force method and virtual work require material parameters and assembly dimensions to establish relative stiffnesses. The other values that were required to complete the calculations were:<\/p>\n<p>t_angle = thickness of the horizontal leg of the angle<\/p>\n<p>b = 1,000 mm (1 m of wall design length)<\/p>\n<p>veneer_thick = thickness of the masonry veneer = 92.1 mm (3.6 in.)<\/p>\n<p>V-tie diameter = 2.4 mm (0.09 in.)<\/p>\n<p>f\u2019m = the compressive strength of the masonry veneer<\/p>\n<p>Em = Modulus of Elasticity of the masonry veneer = 850 f\u2019m<\/p>\n<p>Es = Modulus of Elasticity of structural steel = 200,000 MPa<\/p>\n<p>The proof of the following equations is beyond the scope of this paper but can be determined by applying the force method and virtual work to the free body diagram in Figure 8.<\/p>\n<figure id=\"attachment_210780\" aria-describedby=\"caption-attachment-210780\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-8.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210780 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-8-500x293.jpg\" alt=\"A diagram illustrating a structural engineering concept. It includes labeled points and arrows representing applied forces such as tension (T), compression (C), and a reaction force (R_TIE). Several formulas are presented to calculate reaction ties, vertical forces, and other parameters, utilizing variables like L (length), E (modulus), and angles for clarity.\" width=\"500\" height=\"293\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-8-500x293.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-8-300x176.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-8.jpg 623w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210780\" class=\"wp-caption-text\">Figure 8: Statically indeterminate free body diagram and solved reactions<\/figcaption><\/figure>\n<p>For illustration purposes, the proposed method was applied to the design of a shelf angle anchored to a concrete foundation with post-installed anchor bolts that support a 9-m (30-ft) clay brick veneer. The SAP 2000 structural design software created a 3D finite element model using frame and shell elements. The model was used to compare the accuracy of the 2D force method\/virtual work hand calculation to a 3D model that captures the interaction of the ties and the brick with the shelf angle. Figure 9 illustrates the 3D finite element model.<\/p>\n<figure id=\"attachment_210781\" aria-describedby=\"caption-attachment-210781\" style=\"width: 207px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-9.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210781 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-9-207x500.jpg\" alt=\"This image depicts a structural engineering design of a tall building. On the left, a narrow vertical structure is outlined in red with green elements representing support points. On the right, a similar structure shows detailed staircases and additional framework, demonstrating the building\u2019s vertical construction.\" width=\"207\" height=\"500\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-9-207x500.jpg 207w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-9-124x300.jpg 124w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-9.jpg 331w\" sizes=\"auto, (max-width: 207px) 100vw, 207px\" \/><\/a><figcaption id=\"caption-attachment-210781\" class=\"wp-caption-text\">Figure 9: \u2028SAP 2000 model using shells for angle\/veneer and frames for ties.<\/figcaption><\/figure>\n<p>Table 1 compares the tie reaction, anchor bolt and foundation loads using the statically determinate method, the proposed force method\/virtual work method and the\u00a0SAP 2000 3D model. The proposed force method\/virtual work method and SAP 2000 have excellent agreement in reaction forces and deflections, with a difference of approximately 3.6 percent and \u20289.4 percent, respectively. This demonstrates the force method\/virtual work method better represents interactions between the tie and shelf angles and brick and shelf angles captured with a 3D finite element model. Table 1 also illustrates the difference in the deflection and loads when using the statically determinate method versus the force method\/virtual work method. The difference is approximately \u2028157 percent greater Tf, acting on the anchor bolt, and 572 percent greater deflection in the shelf angle.<\/p>\n<figure id=\"attachment_210782\" aria-describedby=\"caption-attachment-210782\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-10.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210782 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-10-500x184.jpg\" alt=\"A table comparing different models with their respective tie reaction, anchor bolt loads (including vertical and tension), foundation load, and maximum deflection measurements. The models listed are &quot;Statically Determinate,&quot; &quot;Force Method\/ Virt. Work,&quot; and &quot;SAP 2000 - Shells,&quot; with corresponding values for each category.\" width=\"500\" height=\"184\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-10-500x184.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-10-300x111.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-10-768x283.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-10.jpg 800w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210782\" class=\"wp-caption-text\">Table 1: Comparison of model results for a shelf angle supporting 9 m (30 ft) of brick veneer.<\/figcaption><\/figure>\n<p>Table 2 demonstrates the design results of the shelf angle, anchor bolt size, and anchor bolt spacing when using the three different design approaches. In Table 2, the shelf angle thickness was reduced from 13 mm (0.5 in.) when using the traditional approach<sup>6<\/sup> to 6.35 mm (0.25 in.) when using the proposed force method and maintained an acceptable deflection less than L\/480. In addition, as estimated by the proposed force method, the reduction in forces acting on the anchor bolt translates to an increase in bolt spacing from 305 to 406 mm (12 to 16 in.), reducing the number of anchor bolts required. Depending on the wall length, the cost savings are approximately one percent.<\/p>\n<figure id=\"attachment_210784\" aria-describedby=\"caption-attachment-210784\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-11-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-210784 size-large\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-11-1-500x218.jpg\" alt=\"A table comparing specifications for three models: &quot;Statically Determinate,&quot; &quot;Force Method\/Virtual Work,&quot; and &quot;SAP 2000 - Shell elements.&quot; It includes columns for air space, distance to bolt hole, shelf angle size, anchor bolt diameter, and anchor bolt spacing, with measurements in inches and millimeters.\" width=\"500\" height=\"218\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-11-1-500x218.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-11-1-300x131.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-11-1-768x334.jpg 768w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Figure-11-1.jpg 800w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-210784\" class=\"wp-caption-text\">Table 2: Comparison of designed shelf angle size and anchor bolt spacing.<\/figcaption><\/figure>\n<p><em>Author\u2019s note: I would like to thank Jordan Kuntz and Lyndsey Jackson of Jackson Masonry Ltd. for their insights from their field experience with shelf angle installations and performance. Without these insights, the results of these findings would not have <\/em><em>\u2028<\/em><em>been possible.<\/em><\/p>\n<h2><strong>Notes<\/strong><\/h2>\n<p><sup>1<\/sup> Refer to en.wikipedia.org\/wiki\/Home_Insurance_Building<\/p>\n<p><sup>2<\/sup> See the article by McGinley, M., \u201cDesign of Shelf Angles for Masonry,\u201d <em>Structure Magazine<\/em>, structuremag.org\/article\/design-of-shelf-angles-for-masonry-veneers<\/p>\n<p><sup>3<\/sup> Review \u201cShelf-Angle and Brick Ledge Design for Brick Veneer On Mid-Rise Wood-Frame Buildings,\u201d Alberta Masonry Council, Canadian Wood Council, Masonryworx, by Hagel, M.D., Moses, D.., Jonkman, R. (2019). See albertamasonrycouncil.ca\/wp-content\/uploads\/2022\/09\/Tech-Aid-1-Shelf-Angle-and-Brick-Ledge-November-2019.pdf<\/p>\n<h2><strong>Author<\/strong><\/h2>\n<p><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Hagel_Headshot.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-210785 size-thumbnail\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/Hagel_Headshot-150x150.jpg\" alt=\"Mark D. Hagel smiling while wearing a dark suit with a patterned tie. The background is light, emphasizing his formal attire.\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p>Mark D. Hagel, PhD, P.Eng., is the executive director of the Alberta Masonry Council. He holds a bachelor of science in actuarial science and applied mathematics, a bachelor of science in civil engineering, and a doctor of philosophy in civil engineering. Hagel\u2019s fields of expertise include thermal and hygrothermal modelling of building systems, corrosion modelling, Life-cycle Cost Analysis (LCCA), structural analysis and design, and the durability of building components. In 2018, he served on the National Research Council of Canada (NRC) working group that developed the Guideline on Design for Durability of the Building Envelope and in a working group on the CSA-S478-2019 Durability in Buildings. Hagel can be reached at markhagel@albertamasonrycouncil.ca.<\/p>\n<h2><strong>Key Takeaways<\/strong><\/h2>\n<p>With masonry reduced to a single, non-load-bearing veneer, steel shelf angles or brick ledges became necessary to support its weight. Shelf angle design combines masonry, steel, and the building\u2019s primary structural material (concrete, wood, or steel) and is often treated as a \u201csteel\u201d or \u201cconcrete\u201d design challenge rather than a masonry issue. Consequently, the literature on shelf angle design is limited. Designing steel shelf angles is complex due to interactions between the masonry veneer and structural elements, which are difficult to model by hand, often resulting in overdesign. This can increase thermal bridging, carbon footprint, and costs. This article presents examples and strategies for more efficient shelf angle design to support full-bed masonry veneers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Efficient steel shelf angle design: reduce costs, cut thermal bridging, and enhance masonry veneer performance.<\/p>\n","protected":false},"author":34186,"featured_media":210771,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[520,179,184],"tags":[1237,9692,113,9693,9694],"class_list":["post-210769","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-features","category-masterformat","category-04-00-00-masonry","tag-division-04","tag-mark-d-hagel","tag-masonry","tag-shelf-angle","tag-structural-support","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Reducing overdesign: The structural complexity of shelf angles - The Construction Specifier<\/title>\n<meta name=\"description\" content=\"Efficient steel shelf angle design: reduce costs, cut thermal bridging, and enhance masonry veneer performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.constructionspecifier.com\/efficient-shelf-angle-design-for-masonry-veneers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reducing overdesign: The structural complexity of shelf angles - The Construction Specifier\" \/>\n<meta property=\"og:description\" content=\"Efficient steel shelf angle design: reduce costs, cut thermal bridging, and enhance masonry veneer performance.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.constructionspecifier.com\/efficient-shelf-angle-design-for-masonry-veneers\/\" \/>\n<meta property=\"og:site_name\" content=\"The Construction Specifier\" \/>\n<meta property=\"article:published_time\" content=\"2025-01-23T14:52:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/01\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt-F.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"400\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"tanya_martins\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"tanya_martins\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.constructionspecifier.com\\\/efficient-shelf-angle-design-for-masonry-veneers\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.constructionspecifier.com\\\/efficient-shelf-angle-design-for-masonry-veneers\\\/\"},\"author\":{\"name\":\"tanya_martins\",\"@id\":\"https:\\\/\\\/www.constructionspecifier.com\\\/#\\\/schema\\\/person\\\/2fce6c78e0d75dca19e94a5df6b1ff6a\"},\"headline\":\"Reducing overdesign: The structural complexity of shelf angles\",\"datePublished\":\"2025-01-23T14:52:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.constructionspecifier.com\\\/efficient-shelf-angle-design-for-masonry-veneers\\\/\"},\"wordCount\":2376,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.constructionspecifier.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.constructionspecifier.com\\\/efficient-shelf-angle-design-for-masonry-veneers\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.constructionspecifier.com\\\/wp-content\\\/uploads\\\/2025\\\/01\\\/13_SpiderSiteCalgaryAlberta_20231028163852_vNKt-F.jpg\",\"keywords\":[\"Division 04\",\"Mark D. 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