Non-Linear Response Analysis of Plastic Hinged Frames Subjected to Earthquake Ground Motions

In this paper, the analytical method is presented to investigate the behaviors of nonlinear response of framed structures subjected to earthquae ground motions under the occurrence of plastic hinges in members of which framed stucture is formed. Relationship between bending moments and plastic rotation in plastic hinge mechanism is extended to the domain in bi-linear or trilinear type by using the idealized elasto-plastic type relationship proposed by Ray W. Clough. Based on the criteria of judgement on elastic and plastic conditions of members, nonlinear response analysis framed structure is accomplished successively and numerically through so-called incremental linear accerelation procedure. From the results of numerical analysis of 2 case of framed structural models, it is evident that energy absorption owing to hysteresis loop of plasic hinge mechanism have a great effect to decrease the amounts of dynamical response of framed strucure considerably