忠县长江大桥索塔锚固区模型试验与裂纹预测  

Model Test and Crack Prediction for Stay Cable Anchor Zone in Pylon of Zhongxian Changjiang River Bridge

作　　者：姚建军[1] 刘孝辉[1] 李琦[1] 汪宏[1] 李军[1] 

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《桥梁建设》2009年第2期32-35,39,共5页Bridge Construction

摘　　要：忠县长江大桥主桥为(205+460+205)m的双塔双索面斜拉桥,主塔拉索锚固区设置R=1.85 m的小半径U形预应力束,锚固区域的结构构造和受力状态复杂。采用索塔节段足尺模型试验与空间有限元分析相结合的方法研究锚固结构的实际工作状态,对其承载能力进行评估,对锚固区的受力状态及裂纹发展规律进行研究,研究成果对该桥的建设有直接指导作用。The main bridge of Zhongxian Changjiang River Bridge is a double-pylon and double-cable-plane cable-stayed bridge with span arrangement （205＋ 460 ＋ 205） m and the structural formation and stressing conditions of the stay cable anchor zone in pylon of the Bridge are complicated owing to the utilization of sharp radius （R= 1.85 m） U-shaped prestressing tendons there. In this paper, the combined method of the full-scale sectional model test of the pylon and the spatial finite element analysis is used to investigate the actual working conditions of the anchor zone, assess the bearing capacity of the zone and eventually to study the stressing conditions and crack development laws of the zone. The results of the study have direct guidance to the construction of the Bridge.

关 键 词：斜拉桥 桥塔 锚固区 模型试验 有限元法 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] TU317.1[交通运输工程—道路与铁道工程]