Study on Destructive Experiment of Prestressed Concrete Continuous Box Girder Bridge

The Xinxingtang bridge on Huning expressway was taken as an example for introducing the method of destructive experiment of prestressed concrete continuous box girder bridge.The loading and measuring methods and phenomena and stopping conditions of the experiment were presented.The three dimension nonlinear finite element model of the bridge was established considering nonlinear behavior of material and prestressing effect.With this model,the test was simulated.Cracking regularity,mechanical characteristic,damage mechanism and bearing capacity of the bridge were studied through analyzing the results of the experiment and computation.The research shows that(1) the strength and stiffness of the bridge are enough;(2) the damage procedure conforms to the traditional knowledge;and(3) the bearing capacity is more than needed.This experiment provides an important reference for test,design and maintenance of the similar bridges.