鄂东长江公路大桥活载非线性效应与试验分析.pdf

学兔兔 鄂东长江公路大桥活载非线性效应与试验分析 李 鸥，彭旭民 31 文章编号：1003—4722(2011)05—0031—05 鄂东长江公路大桥活载非线性效应与试验分析 李 鸥 ，彭旭民 (1．中铁大桥局集团桥科院有限公司，湖北 武汉430034； 2．桥梁结构安全与健康湖北省重点实验室，湖北 武汉430034) 摘 要：为了分析几何非线性对大跨度斜拉桥的活载效应的影响程度，以鄂东长江公路大桥 (主跨926 m的双塔双索面混合梁斜拉桥)为背景，利用MIDAS Civil软件建立全桥有限元模型， 分别计算该桥在活载作用下考虑非线性效应与不考虑非线性效应的结构内力及位移，并与全桥荷 载试验实测结果做对比分析。结果表明：对于鄂东长江公路大桥这样超大跨度的斜拉桥，活栽的非 线性计算结果更加符合大跨度斜拉桥的实际响应，线性计算结果误差较大，且偏于不安全 。 关键词：斜拉桥；大跨度；活载；几何非线性；静载试验 中图分类号：U448．27 文献标志码：A Testing and Analysis of Live Load Nonlinear Effect of Edong Changj iang River Highway Bridge LIOu 一，PENG 一rain1，2 (1．Bridge Science Research Institute Ltd．，China Railway Major Bridge Engineering GrouP，Wuhan 430034． China；2．Key Laboratory of Bridge Structure Safety and Health of Hubei Province Wuhan 430034，China) ， Abstract：To analyze the degree of geometric nonlinearity influence on the live load effect of long span cable—stayed bridges，the Edong Changj iang River Highway Bridge(a hybrid girder ca— ble—stayed bridge with double pylons，double cable planes and with a main sPan 926 m)was cited as an example，the software MIDAS Civil was used to establish the finite element mode1 for the whole bridge and the structural internal forces and displacement of the bridge under the action of the live load that took and did not take account of nonlinear effect wete respective1y calculated and were analyzed and compared with t