Reliability Models for Shear in Reinforced Concrete Beams


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Title: Reliability Models for Shear in Reinforced Concrete Beams

Author(s): A.S. Nowak and P. Paczkowski

Publication: Special Publication

Volume: 265


Appears on pages(s): 627-646

Keywords: beam; calibration; reliability; shear capacity; shear reinforcement.

Date: 10/1/2009

Recent calibration of ACI 318-08 for concrete structures was focused on the flexural capacity. The objective of this paper is to develop the statistical parameters for shear capacity of reinforced concrete beams. The capacity of shear reinforcement is a function of steel cross section area, yield strength, and spacing of stirrups. In this paper, the capacity of concrete is considered using ACI formulas and other shear capacity models available in literature. The analysis is performed for various reinforcement ratios, longitudinal and transverse, including beams without web reinforcement. The statistical parameters of resistance are determined from the test results. The reliability analysis is performed, and it serves as a basis for the selection of resistance factors. The selection criterion is closeness to the target reliability index. Recommended values of resistance factors are provided for each of the considered shear capacity methods.