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自锚式悬索桥静力特性模型试验研究

, PP. 108-114

Keywords: 桥梁工程,自锚式悬索桥,模型试验,静力特性,有限元仿真,相似理论

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Abstract:

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。

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