Shear behavior of prestressed concrete U-beams

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Title: Shear behavior of prestressed concrete U-beams
Author: Moore, Andrew Michael, 1984-
Abstract: An experimental study was conducted at the Ferguson Structural Engineering Laboratory in order to investigate the shear behavior of 54 -inch deep prestressed concrete U -beams . The primary goal of this research was to improve the design and detailing of the skewed end -blocks commonly used in these beams . As U -beams had been in service for several decades without incident , it was anticipated that there would be little need for change in the design , and the findings of the research would involve a slight tweaking to improve the overall performance . Unfortunately , during the first phase of shear testing (testing of the current design standard ) it was found that the U -beam was not reaching the code calculated shear capacity . During this phase of testing the premature failure mechanism was isolated as the breakdown of the web -to -flange interface in the end region of the girder . Therefore , the second phase of testing sought to prevent the breakdown of this boundary by three options : (1 ) increasing the web width while maintaining current levels of mild reinforcement , (2 ) increasing the web width while also increasing the amount of reinforcement crossing the web -to -flange boundary , or (3 ) by increasing the amount of reinforcement at the boundary while maintaining the current web width . Two acceptable solutions to the premature failure method were developed and tested during this phase both of which included an increase in the amount of mild reinforcement crossing the web -to -flange interface (with and without an increase in web width ) . The research into refining of these new details is ongoing as part of the Texas Department of Transportation’s Research Project number 0 -5831 .
URI: http : / /hdl .handle .net /2152 /ETD -UT -2010 -12 -2398
Date: 2011-02-14

Citation

Shear behavior of prestressed concrete U-beams. Master's thesis, University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /ETD -UT -2010 -12 -2398 .

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