Research on the seismic response control of long-span bridge is of great significance for bridge seismic safety.In this paper

Maochaojie Bridge with a main span of 368m is taken as an example.A 3-dimensional finite element model of the concrete-filled steel tubular（CFST） bridge is established based on ANSYS and the modal analysis is conducted by using the subspace iteration method. The seismic response and control of long-span CFST arch bridge are investigated.The parametric sensitivity study on seismic control devices including the elastic connection and the viscous dampers are emphasized.Moreover

the control effects of devices installed at different locations are compared with each other.Results show that the longitudinal mode shape makes the greatest contribution to the longitudinal relative displacement between girder and arch ribs;both the elastic connection devices and the dampers can effectively reduce the relative displacement between girder and arch bids;when all of the seismic responses of key sections are considered

using the elastic connection and the dampers together and installing the devices evenly can achieve the optimal control effect.The conclusions can provide references for the seismic design of long-span half-through CFST arch bridges.