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本文通过一座4×30m先简支后连续预应力混凝土箱梁桥的荷载试验,采用挠度测试数据进行有限元模型修正,总结出了模型修正计算中的关键技术,如目标函数的建立,优化方法等,提出模型优化计算中需要注意的关键问题,识别出装配式桥梁薄弱刚度的位置,并对识别的刚度进行了验证,总体上看,有限元模型修正的截面刚度是具有一定的可信度的,能够满足工程应用的要求。
In this paper, a 4 × 30m first simply supported continuous prestressed concrete box girder bridge load test, the use of deflection test data for finite element model correction, summed up the model correction calculation of key technologies, such as the establishment of the objective function, optimization methods Etc. The key problems that need attention in model optimization calculation are put forward. The position of the weak stiffness of the bridge is identified and the stiffness of the bridge is verified. Generally speaking, the stiffness of the section modified by the finite element model is a certain degree of reliability , To meet the requirements of engineering applications.