库区复建公路桥梁多点激励地震反应分析OA

Taking the Mishi Reservoir Project in Liangshan Prefecture of Sichuan Province,Traffic Reconstruction Road Luobo Bridge,as the engineering background,a spatial truss model of a high pier and large-span continuous rigid frame bridge is established,and seismic design calculations are carried out according to the multi modal response spectrum and time history analysis methods.The time history analysis method focuses on considering both consistent and multi-point excitations,and provides a detailed analysis and comparison of various calculation methods to obtain the seismic responses of bridges.Calculations results show that the smaller the shear wave velocity,the greater the difference between the calculated internal forces and displacements of key sections in large-span continuous rigid frame bridges considering multi-point excitation and consistent excitation.The application of multi-point excitation in seismic design can provide a deeper and more realistic understanding of the stress state of bridges under multi-point seismic motion.