The response surface model and the detailed finite element model were established

they were used for updating the finite element model of Zhonghua bridge

and the results from the updating finite element model were verified by measured dynamic data of the bridge.And based on the updated finite element model

the influence of prestress on modal information（frequency and vibration mode）for prestressed reinforced concrete bridge and the element type on the bridge modal frequency were analyzed.The results show that the updated finite element model can accurately represent the dynamic characteristics of the bridge structure

the updating method based on response surface model and the genetic algorithm can be used efficiently in health monitoring and condition evaluation.Besides

prestress rarely affects the modal information of the prestressed reinforced concrete bridge

and solid element is a better choice for the bridge system composed of multiple prestressed concrete beams.