Weighty Matters: An overview of in-situ load testing

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In-situ load testing is a powerful tool to assess the performance of structures with respect to their ability to carry code-prescribed loads. The practice dates back to the late 1800s and has been used to verify the load rating of structures, as well as the expected performance of structures in retrofit, repair, and strengthening applications.

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Specifying Broomed Exterior Concrete Surfaces

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As a safety requirement, all exterior concrete surfaces must have a slip-resistant surface. The most common method for this is specifying a ‘broom finish.’ But, is that all there is to it? Specifications must also satisfy owner requirements for appearance, flatness, texture, as well as drainage.

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Using UHPC to improve box-beam bridge performance

Pouring ultra-high-performance concrete (UHPC) for longitudinal joints—the material could offer new benefits in box-beam bridge design and construction. Images courtesy Ohio University’s Russ College of Engineering and Technology

Out of the many types of bridges used across the country, adjacent prestressed, concrete box-beams have become popular for short and medium spans. Since these bridges are cost-effective, fast to construct, and easy to design, they are preferred by many state and local agencies. Currently used in about two-thirds of the country, many of these bridges are now approaching the end of their life span. Ultra-high-performance concrete (UHPC) could offer game-changing advances for this type of structure.

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Specifying Structural Framing Systems

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Many factors come into play when designers specify structural framing. There are so many criteria, sometimes there is no absolute answer as to which framing system would perform best. At the same time, the interests of various parties must be served, meaning the final selection does not always rest with the structural engineer.

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