DYNAMIC RESPONSE ANALYSIS METHOD FOR NONLINEAR MULTIPLE DEGREE OF FREEDOM SYSTEM

摘要

Provided is a dynamic response analysis method for a nonlinear multiple degree of freedom system, said dynamic response analysis method providing relatively high analytical accuracy while incurring relatively low computational costs. In this method, a nonlinear multiple degree of freedom system is modally expanded on the basis of natural vibration modes in an elastic range, ignoring mode interactions in a ductile range and applying a hypothetical superposition principle to superposition of modes. The maximum distortion in each mode is found by using mode ductility rates obtained from a constant ductility response spectrum that is created by time history response analysis of a nonlinear single degree of freedom system.