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以平顶山市城东河路湛河桥主桥——斜靠式拱桥为工程实例,采用有限元程序Midas/Civil对该桥进行空间有限元离散,建立斜靠式拱桥空间有限元计算模型,采用一次落架法、用吊杆张力设计值作为吊杆张拉控制力的计算方法、影响矩阵法3种不同方法求解了吊杆初始张拉控制力,并建立相应的计算模型。从计算结果可以看出:采用影响矩阵法确定吊杆张力的方法得到的吊杆张力响应值与设计值吻合较好,保证了成桥时桥梁的内力和线形,是斜靠式拱桥确定吊杆张力的合适计算方法,对复杂空间异形梁拱组合桥的吊杆张力确定有较大的参考价值;其他两种方法计算结果偏差较大。
Taking the Zhanhe bridge-reclining arch bridge of Chengdonghe Road in Pingdingshan City as an example, the spatial finite element method is used to discretize the bridge using the finite element program Midas / Civil. The space finite element model of the reclining arch bridge is established. One-time fall method, using the boom tension design value as the calculation method of the boom tension control force, the matrix method affects the initial tension control of the boom by three different methods and establishes the corresponding calculation model. It can be seen from the calculation results that the tension response value of the boom obtained by the method of the influence matrix method is in good agreement with the designed value to ensure the internal force and linearity of the bridge when the bridge is completed. Appropriate calculation method of tension has great reference value to determine the boom tension of composite beam with special-shaped beam arch bridge. The other two methods have large deviation.