车道荷载作用下的矮塔斜拉桥的索梁活载比  

Under the Action of the Lane Load for Cable/Girder Ratio of the Extradosed Cable-stayed Bridges

作　　者：宋涛[1] 宋一凡[1] 贺拴海[1] 文锋[1,2] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,西安710064 [2]中交公路规划设计院,北京100010

出　　处：《武汉理工大学学报》2014年第12期95-99,共5页Journal of Wuhan University of Technology

基　　金：交通运输部西部交通建设科技项目(2011 812 318 970);中央高校基本科研业务专项资金项目(CHD 2012JC001)

摘　　要：针对矮塔斜拉桥的受力特点,现有的界定矮塔斜拉桥与斜拉桥索梁活载比简化公式存在缺陷。采用比拟梁法,推导出车道荷载作用下的索梁活载比计算公式。比较了该公式与已有简化公式和有限元计算结果,结果表明,该公式与有限元解更为逼近。研究表明,在计算矮塔斜拉桥的索梁活载比时要计入车道荷载中的集中荷载的影响,并提出权矩阵可界定矮塔斜拉桥、斜拉桥及连续体系梁桥。On the basis of the loading features of extradosed cable-stayed bridges, there are some defects existed in the simplified cable/girder live load ratio formulation between extradosed cable-stayed bridges and cable-stayed bridges. Using the analogy girder method, cable/girder live load ratio formulation under the action of lane load was deduced. Compared with the results of present simplified formulation and finite element method （FEM）, it shows that the above formulation is closer to the finite element method （FEM）. The experimental results shows that calculating of the cable/girder live-load ratio of the extradosed cable-stayed bridges should consider the influence of concentrated load of the lane load. The concept of the weight matrix was introduced to separate the extradosed cable-stayed bridges from the cable-stayed bridges and the continuous girder bridge.

关 键 词：矮塔斜拉桥 车道荷载 索梁活载比 权矩阵 简化公式 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]