曲线部分斜拉桥成桥阶段模型试验研究
Model test on curved extra-dosed bridge under live loading

为研究曲线部分斜拉桥结构受力特性，根据相似理论，对依托工程进行1/40的全桥缩尺模型试验。主要研究在等效车道荷载作用下模型桥主梁跨中弯矩、塔顶偏位、斜拉索索力及边支座支反力等工况下控制断面的最不利效应，并将试验实测值、模型计算值与按相似理论进行换算后的实桥计算值对比分析。研究结果表明：在各自对应的最不利荷载作用下，跨中截面仍有充足的压应力储备，拉索应力仍满足规范1.67的安全系数，支座亦不会出现脱空现象，表明该结构在设计荷载作用下安全性较高；在对称荷载作用下，2主塔偏位基本一致，表明该体系对称性较好；试验测试数据与理论计算值吻合较好，模型桥能较准确地反映实桥的受力特点，验证了结构计算理论。
In order to study the mechanical characteristics of the curved extra-dosed bridge, a model was made with the ratio of 1/40 to the in-situ bridge based on the similarity theory. In this paper, some key sections was tested under their most unfavorable conditions equivalent to lane loading in the model bridge such as the mid span , the top tower, the cable and side bearing support. Through comparing the experimental data, the model calculation data and real bridge model calculation data, it shows that, the mid-span girder has sufficient compressive stress, the cable meets the safety factor of 1.67, and the bearing separation will not occur in the respective corresponding most unfavorable load. And the deviation of the main tower is basically the same under symmetrical load, which shows that the system is symmetric. The test data are consistent with theoretical result, and the model can accurately reflect the characteristics of the real bridge, which verifies the structure calculation theory