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Contribution of Stirrups to Shear Resistance
While the parallel chord truss model is a universally accepted model for evaluating the contributions of stirrups to the shear capacity of slender beams, codes-of-practice provide very different mean of evaluating the angle of diagonal compression of the struts in this truss model. This angle controls the contribution of shear reinforcement as the number of stirrups "n" to be counted as lifting the diagonal compressive force up a vertical tie in the truss is proportional to the cotangent of the angle of diagonal compression relative to the longitudinal axis of the beam. ACI318-08 assumes that this angle of diagonal compression is 45 degrees, while the AASHTO LRFD Bridge Design Specifications and EuroCode2 allow much flatter angles of diagonal compression to be used. The effect is that the contribution of in-place stirrups in a particular beam by one approach can be close to 3 times that calculated by another approach. The basis and appropriateness of different approaches are explored.
Contribution of Stirrups to Shear Resistance
While the parallel chord truss model is a universally accepted model for evaluating the contributions of stirrups to the shear capacity of slender beams, codes-of-practice provide very different mean of evaluating the angle of diagonal compression of the struts in this truss model. This angle controls the contribution of shear reinforcement as the number of stirrups "n" to be counted as lifting the diagonal compressive force up a vertical tie in the truss is proportional to the cotangent of the angle of diagonal compression relative to the longitudinal axis of the beam. ACI318-08 assumes that this angle of diagonal compression is 45 degrees, while the AASHTO LRFD Bridge Design Specifications and EuroCode2 allow much flatter angles of diagonal compression to be used. The effect is that the contribution of in-place stirrups in a particular beam by one approach can be close to 3 times that calculated by another approach. The basis and appropriateness of different approaches are explored.
Contribution of Stirrups to Shear Resistance
Kuchma, Daniel (author)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-8
2009-04-29
Conference paper
Electronic Resource
English
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