空腹式拱桥影响线实测方法研究

针对空腹式拱桥的结构特点,给出采用逐次加载的方式测试该类桥型影响线的方法、推导出影响线的计算公式,并通过与有限元法计算值及荷载试验所得值进行对比,在实桥上验证了该方法的可行性。实桥测试位移影响线与有限元计算影响线吻合较好,说明该方法适用于同类桥型的影响线测试;实测位移值与荷载试验位移值差别很小,说明该方法结果可靠、精度较高。

Study of Measuring Method of Influence Line of Open-Spandrel Arch Bridge

In light of the structural characteristic of the open-spandrel arch bridge,the method of testing the influence line of such type of bridge by way of successive loading is presented,the calculation formula of influence line are deduced,and the testing value is compared with the values calculated by the finite element method and got in the load test.The feasibility of the method was verified in a real bridge.The measured influence line of displacement matches well with the influence line calculated by the finite element method,which indicates that the method is applicable for the testing of the influence line of the same type of bridge.The difference between the measured displacement value and the displacement value in load test is little,showing the reliability and accuracy of the method is high.