斜拉桥异形截面索塔锚固区足尺模型试验与应力分析  

Full-Scale Model Test and Stress Analysis of Anchorage Zone in Irregular Shape Section Pylon of Cable-Stayed Bridge

作　　者：李跃[1,2] 朱宏平[1,3] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]武汉市汉阳区建筑管理站,湖北武汉430050 [3]华中科技大学控制结构湖北省重点实验室,湖北武汉430074

出　　处：《桥梁建设》2011年第1期30-34,共5页Bridge Construction

基　　金：国家自然科学基金资助项目(50925828)

摘　　要：斜拉桥索塔锚固区是桥梁结构的关键受力部位,特别是对于异形截面形式的桥塔来说,单纯的力学分析很难反映结构的实际工作状态与应力分布状况。为此,针对马岭河特大桥非对称六边形索塔锚固区进行足尺节段模型试验,对试验过程中节段模型裂缝的产生、发展及应力等进行观测和分析,并对索塔锚固区节段进行空间有限元分析。结果表明,试验和理论分析结果符合程度较好,索塔锚固区连接部位外侧以及折线形长边内侧转角2个区域是开裂敏感区,其抗裂安全系数为1.3,破坏安全系数为1.6。The anchorage zone in pylon of a cable-stayed bridge is the critical load bearing part of the bridge,particularly for the pylon having irregular shape section,it will be even more difficult to represent the actual working conditions and stress distribution of the structure simply by means of the mechanical analysis.In this regard,the full-scale segment model test was made for the asymmetric hexagonal anchorage zone in the pylon of the cable-stayed bridge of Maling River Bridge.The occurrence and development of the cracking and stress in the segment model in the testing were observed and analyzed and the spatial finite element analysis was made as well for the segments of the anchorage zone in the pylon of the bridge.The results reveal that the test and theoretic analysis are well agreeable.The two areas of the outer side of the connection part of the anchorage zone and the turning angle at the inner side of the kinked long side are the cracking sensitive areas,the cracking safety coefficient for the areas is 1.3 and the failure safety coefficient is 1.6.

关 键 词：斜拉桥 桥塔 锚固段 模型试验 裂缝 应力分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]