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为研究自锚式悬索桥在运营阶段的静载响应规律,以应变相等为原则,按静力相似理论对哈尔滨市三环西线跨松花江大桥主桥进行1∶50缩尺模型试验研究。以轴向刚度、弯曲刚度相似为主进行模型设计,重点关注桥梁的受力与变形性能。根据有限位移理论的仿真分析,结合相关规范的规定,制订桥梁静力试验工况及试验方法。基于最不利加载工况下的试验数据,对该桥的主缆、吊索、主梁的受力及变形特征进行分析。结果表明:双塔对称体系自锚式悬索桥的边主跨挠度分布情况与三跨连续梁类似,但由于竖向索力的弹性支撑作用,结构挠度减小,证明结构在静力作用下能承担的荷载更大;各关键构件荷载安全系数均在规范限值以内,大桥结构受力偏于安全;各测试工况试验值与理论计算值总体吻合较好,模型能较好反映实桥的受力特性,同时也印证了缩尺模型设计的合理性。
In order to study the static load response law of self-anchored suspension bridge during the operation phase, the 1:50 scale model test of the main bridge across the Songhua River Bridge in Harbin’s Third Ring Road is carried out based on the principle of static similarity based on the principle of equivalent strain. The model is designed with similar axial stiffness and bending stiffness, with emphasis on the stress and deformation performance of the bridge. According to the finite displacement theory of simulation analysis, combined with the relevant provisions of the norms to develop the bridge static test conditions and test methods. Based on the test data under the most unfavorable loading conditions, the force and deformation characteristics of the main cables, slings and girders of the bridge are analyzed. The results show that the deflection of side main span of self-anchored suspension bridge with twin tower symmetry system is similar to that of three-span continuous beam. However, due to the elastic supporting effect of vertical cable force, the deflection of structure decreases, which proves that the structure can bear under static force The loads of all the key components are within the limits of the code and the stress of the bridge structure is biased to safety. The test values of all the test conditions are in good agreement with the theoretical ones, and the model can better reflect the real bridge Force characteristics, but also confirmed the rationality of the scale model design.