Seismic Response Analysis on Multiple Inputs of Piping Systems with Friction Characteristics and Experimental Verification

Abstract

This study is a basic research to propose a simple estimation method of the maximum response value using response reduction factor in seismic response analysis of multi-input piping system with friction characteristic. In the linear system, a method for estimating the maximum response of the multiple input system by adding the maximum response from each input has been proposed. In addition, in a condition of one input system having nonlinearity such as friction, it can not be applied to multi-input nonlinear system. Assuming actual piping, response analysis of multi-input nonlinear system is necessary for rationalization of seismic design. Therefore, in this study, we introduce a nonlinear strength as the frictional force and clarify by simulation what kind of influence it will have on the maximum response of piping system under various conditions. Furthermore, we compare the results obtained by simulation with those of experiments and examine whether the proposed estimation method can be actually used.