对任家坝大桥震后承载力的评估

Bridge bearing capacity appraisal to special loads

对既有旧桥的震后承载力进行了评估,指出评价桥梁震后其承载力能否达到要求,除了进行理论计算外,还应进行现场荷载试验,以检验结构是否具有足够的强度和刚度。同时,以江油"任家坝大桥承载力检测试验"为例,对检测方法和过程进行了分析。首先,用通用的结构分析软件MIDAS/Civil,对该桥承载力进行了复核;在此基础上,对任家坝大桥进行了现场检测,并做了静载试验。计算和试验结果均表明,虽然受到"5.12汶川大地震"的影响,但该桥使用状况尚好,目前的刚度和承载力尚能满足通行80t重车的要求,然而就耐久性要求而言,该桥身和桥墩柱所有的裂缝和缺陷,必须尽快予以修补、加固,才能确保它在剩余设计使用年限内的安全使用。

Study the appraise methods of the old bridge to special loads,pointed out that whether the bearing capacity of a bridge to special loads meet the requirement,in addition to theoretical calculations,load test should also be carried out to test whether the structure has sufficient strength and stiffness. At the same time,take Jiangyou＂Renjiaba bridge bearing capacity test＂as an example,analyze the detection methods and processes. First of all,with general structural analysis software MIDAS / Civil,the bearing capacity of the bridge has been reexamined,on this basis,field detection and dead load experiment have also been carried out. Calculated and experimental results show that,although the＂5.12 Wenchuan Earthquake＂,the bridge is in good condition and has sufficient strength and rigidity,meet the requirement of crossing 80 t truck.