A new simple method to on line survey and analyse the real time response of bridges

In this paper,a new simple method is put forward to on line survey and analyse the real time response of bridges loaded under random vehicles and people.Based on linear elastic hypothesis and finite element method,the dynamic whole displacement state and load of the bridge can be obtained through surveying partial displacements,so the problem that load is unknown and difficult to determine when calculating is solved in a sense.This method is adapted to girder bridge,arch bridge,cable stayed bridge and suspension bridge.Through the instrumentality of ways and means in this treatise,a real time system to survey and analyse a working bridge can be established.