Effect study of strut rail stiffness of long-span steel arch bridge on anti-seismic performance of the whole bridge

Taking long-span steel arch bridge Zhigu Bridge in Tianjin as the research,the change law of internal forces and displacements under Tianjin wave,the law of three-dimensional consistent stimulate and the traveling wave were analyzed.Meanwhile the effect of change of strut rail stiffness on seismic response of full-bridge was discussed.The results showed that vaults of long-span steel arch bridges had much less sensitive degree to the internal forces than arch foot's,while bridges with smaller strut rail stiffness had more internal forces,and strut rail showed significant influence on transverse moment.