Spatial dynamic property analysis of X-style arch bridge

The second Zhanhe bridge in the city of Pingdingshan is taken as the engineering background,its spatial finite element model is established by adopting the finite element program ANSYS,and its dynamic property analysis has been carried out.The obtained results indicate that the transverse stiffness of arch rib is weaker than the vertical and torsional stiffness of the bridge,the transverse vibration of arch rib appears first,and the local transverse vibration is prone to occurrence at the end of arch rib,so there is a dynamic weak point of the bridge;The results also show that the first several natural vibration periods are longer,the more modes of vibration should be taken into account mode-superposition method in the seismic design of the bridge,in order to decrease influence of the shortage of mass;each member of the bridge cooperates well,and the bridge has better grobal property.The conclusions can offer reference for the design of similar bridges.