Collapse simulation of reinforced concrete including localized failure and large rotation using extended RBSM

Abstract

In this study, an extended Rigid-Body-Spring Model (RBSM) considering geometric nonlinearity including finite rotation is developed based on an equivalence between the RBSM and the reduced integration Timoshenko beam element in order to simulate not only damage localization behavior but also large displacement and large rotation collapse behavior of reinforced concrete structures. Firstly, an elastic buckling response of a column is simulated by using the proposed method. By comparing the simulation result and the exact solution, it is confirmed that the proposed model can reproduce the large displacement and large rotation behavior in the elastic range. In addition, several numerical simulations of failure behavior of concrete and reinforced concrete members are presented. It is also confirmed that the model can simulate localized damage, rebar buckling and large rotational collapse behavior.