Simplified Shear Design of Structural Concrete Members (2005) / Chapter Skim
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These values control the concrete and steel contributions to shear resistance. Although this method provided a unified treatment for the design of reinforced and prestressed concrete structures and offered some significant performance advantages, the procedure was unfamiliar to design engineers, more complicated than the shear design procedure in the AASHTO Standard Specifications, and often required an iterative solution.
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In addition, a survey was conducted of practitioners in 26 different state DOTs and federal lands bridge design agencies on the use of the LRFD Sectional Design Model and of the AASHTO standard shear design method. These assessments resulted in the following findings subsequently used for developing change proposals and simplified provisions: • The survey of the design practice showed that (1)
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3. The LRFD Sectional Design Model and the CSA Method produced very similar estimates of the shear capacity of the members in the experimental database of shear test results.
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Switching from the AASHTO Standard procedure to either of the proposed design methods will allow for the design of members for considerably higher levels of shear stress and thereby enable the same size section to be used to span longer distances or support heavier loads. It will also involve an increase in the minimum required amounts of shear reinforcement which will improve safety.
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