三汊矶湘江大桥整体模型试验  

Total Bridge Model Test of Sanchaji Xiangjiang Bridge

作　　者：宋旭明[1] 戴公连[1] 方淑君[1] 

机构地区：[1]中南大学桥梁工程系,湖南长沙410075

出　　处：《中国公路学报》2009年第1期53-59,共7页China Journal of Highway and Transport

基　　金：湖南省自然科学基金项目(03JJY3085)

摘　　要：为了获得自锚式悬索桥施工阶段结构体系转换过程中各构件的受力状况及成桥后结构的力学性能,利用优化方法计算了缆索系统的安装过程,并对三汊矶湘江大桥进行了缩尺比例为1∶28的整体模型试验。介绍了优化计算的原理以及模型设计、试验方案的细节,并对施工过程中顶升主梁进行吊索的无应力安装过程以及活载作用下结构力学性能的测试和计算作了详细说明。结果表明:模型试验的测试结果与计算值吻合良好,吊索的无应力安装能够满足施工阶段的受力要求并达到设计成桥线形;活载作用下结构挠度、应力与荷载呈线性关系,叠加原理能够适用。In order to obtain the mechanical status of the self-anchored suspension bridge in construction stage in the course of system transition and the mechanical performance under live load, optimal method was used to calculate the installing process of cable system and a total bridge model test of Sanchaji Xiangjiang Bridge was made with the scale 1 ： 28. The principle of optimal calculation, details of model design and test method were introduced. The test and calculation of the unstressed installing of hangers by jacking the girder and the mechanical performance of self-anchored suspension bridge under live load were presented. The result indicates that the calculated values agree well with the model test results. The construction method adopted fits the requirement of mechanics and the design shape of main cable can be achieved. The deflection and stress of the structure are linear with load under effect of live load. The superposition principle can be used.

关 键 词：桥梁工程 自锚式悬索桥 模型试验 无应力安装 力学性能 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]