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为了对大跨度拱形钢塔斜拉桥的力学行为特性进行分析和试验验证,以之江大桥为工程背景对此类结构进行了模型试验研究。首先介绍了试验模型的设计,并通过试验模型的有限元模拟,证明了试验模型能很好地反映实际结构的受力性能。最后对组装成桥的试验模型,进行了4个工况的加载试验,并以中跨跨中最大弯矩的工况为例对主塔应力和主梁变形的试验结果进行了分析,分析结果表明实测数据与实桥计算结果折算值较为接近,实际结构有较大的安全储备。
In order to analyze and test the mechanical behavior of long-span arch-steel cable-stayed bridge, the model test of this kind of structure is carried out with the project of the Zhijiang Bridge. First, the design of the test model is introduced. Through the finite element simulation of the test model, it is proved that the test model can well reflect the mechanical performance of the actual structure. Finally, the loading test of the assembled bridge was carried out in four working conditions. The test results of stress and deformation of the main girder were analyzed with the working condition of the maximum bending moment in the mid-span span as an example. The analysis results It shows that the measured data is close to the calculated result of real bridge, and the actual structure has a larger safety reserve.