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多跨斜拉-自锚式悬索组合体系桥全桥静力模型试验

Keywords: 桥梁工程,多跨斜拉-自锚式悬索组合体系桥,模型试验,相似准则

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Abstract:

为了验证多跨斜拉自锚式悬索协作体系桥梁结构的力学特性,以汉中西二环龙岗大桥为原型,依据静力相似理论,设计制作了1/20的全桥缩尺模型,重点研究了桥塔、主梁、拉索、吊杆的材料及截面设计原则,分析了它们在制造过程中的工艺难点及解决方法,制定了该类桥梁静力试验工况。结果表明对弯压性质的模型试验,应采用截面的抗弯刚度和抗压刚度相似作为设计原则,受缩尺效应的影响,在试验前应全面考虑各材料选取、传感器的尺寸及位置等;成果可供以后类似工程模型试验提供借鉴;试验实测值与实桥换算的理论值吻合较好,模型桥反映的实桥受力特性良好。

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