ABSTRACT
A detailed analytical modeling of P-M yield interaction is presented in Chapter 1, defining the limit boundaries with six subdomains based on Eurocode currently in prevalence. In this chapter, the developed P-M interaction domains are verified for plastic flow-rule in two main sections: (1) tension failure resulting in yielding of steel and (2) compression failure resulting in crushing of concrete. The conventional limit P-M domain is described according to Eurocode currently in prevalence as long as the plastic strain increment becomes nearly normal to the yield domain over the part of bending response, in the presence of axial force. The flow rule verifies for a close agreement in all subdomains of tension failure, while it does not qualify in a few of the subdomains of crushing failure. The mathematically developed P-M interaction model is thus capable of identifying the damage mechanism of different subdomains in RC sections, in a closer agreement for tension failure subdomains, in particular; damage identification is made on the basis of strain profile of concrete and reinforcing steel.
