Nonlinear static-dynamic coupling analysis based on maximum initial time-step method
YIN Xunqiang;LI Haoran;WANG Guixuan;Dalian University Civil Engineering Technology R&D Center;
Static-dynamic coupling analysis is one of the key technology issues for analysis of structure response in nonlinear condition. Combined with the implicit solving character of Newmark integral algorithm,a nonlinear staticdynamic coupling algorithm based on Maximum Initial Time-step Method is raised,by studying the inner relation between nonlinear finite element static and dynamic equilibrium equations for solving this issue. The algorithm could obtain rational nonlinear earthquake response of the structure under static and dynamic coupling excitation.The method is verified by seismic response numerical analysis of Koyna gravity dam. The result of analysis shows that the method is effective and rational. Meanwhile,the algorithm can be used in kinds of implicit solving general finite element program conveniently easily,and it's more powerful in operability and more convienient in engineering application.