超大跨自锚式悬索桥施工过程中力学性能的试验研究

发布时间：2018-05-02 16:59

本文选题：超大跨 + 自锚式悬索桥　；参考：《土木工程学报》2014年06期

【摘要】：为了研究超大跨自锚式悬索桥施工过程中的力学行为,以跨径160m+406m+160m的双塔双索面超大跨自锚式悬索桥——武西高速公路桃花峪黄河大桥为依托,按照1/30的几何缩尺比和1∶1的力学缩尺比进行试验模型设计及全桥模型试验研究。试验结果揭示出三跨自锚式悬索桥施工过程中"主缆平衡点偏移效应",且理论论证了"主缆平衡点偏移效应"的适用条件,分析出边、中跨主缆不同的非线性效应和变形规律及吊索索力随施工过程的变化规律,指出基于无应力状态控制法、确保吊索张拉安全的吊索二次张拉法和边、中跨主缆位移弱相干性不同的适用条件,得出交界墩及塔梁结合处支反力随施工过程的变化规律及加劲梁配重大小和时机的控制因素,对同类工程具有借鉴意义。
[Abstract]:In order to study the mechanical behavior of super-large span self-anchored suspension bridge during construction, based on the double-tower and double-cable plane super-large span self-anchored suspension bridge-Taohuayu Yellow River Bridge of Wuxi Expressway, the span of 160m 406m is used as the basis. According to the geometric scale ratio of 1 / 30 and the mechanical scale ratio of 1:1, the experimental model design and the full bridge model test are carried out. The test results reveal the "offset effect of the main cable equilibrium point" during the construction of the three-span self-anchored suspension bridge, and theoretically demonstrate the applicable conditions of the "main cable equilibrium point offset effect", and analyze the edges. Different nonlinear effect and deformation law of mid-span main cable and variation law of cable force with construction process are pointed out. Based on the non-stress state control method, the second tension method and edge of sling are pointed out to ensure the safety of sling tension. Under the conditions of different weak coherence of the displacement of the mid-span main cable, the variation law of the support reaction force at the junction pier and the connection of the tower and beam with the construction process and the control factors of the weight and timing of the stiffening beam are obtained, which is of reference significance for the similar projects.
【作者单位】：重庆交通大学土木建筑学院;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：交通运输部联合科技攻关项目(2010-353-341-230)
【分类号】：U448.25

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