3 - Failure criterion of concrete under multiaxial compression

Abstract

The properties of concrete under multiaxial compression is very complex, and it is important for the behavior analysis of composite column. This chapter analyzed the biaxial compressive strength and triaxial compressive strength of concrete. The analysis results show that the intermediate principal stress, hydrostatic stress, and principal shear stress are the main influence factors for the failure criterion of concrete under multiaxial stress. Based on the Twin Shear Strength Theory, three kinds of failure criterion models were developed with multiple parameters. The five-parameter model A is based on principal shear stress, the five-parameter model B is based on hydrostatic stress, and the six-parameter model considers both principal shear stress and hydrostatic stress. The parameters for these failure criterion models have clear physical significance and form the failure criterion in the theoretical analysis. These proposed models can be the foundation for nonlinear analyses of concrete under multiaxial compression.