特大跨径悬索桥承载能力评定研究  

Evaluation of Load Bearing Capacity of Super-Long-Span Suspension Bridge

作　　者：虢曙安 刘国坤 徐朔 张航 GUO Shu-an;LIU Guo-kun;XU Shuo;ZHANG Hang(Hunan Communications Research Institute Co.,Ltd.,Changsha 410015,China)

机构地区：[1]湖南省交通科学研究院有限公司,湖南长沙410015

出　　处：《桥梁建设》2020年第6期73-78,共6页Bridge Construction

基　　金：湖南省交通运输厅科技进步与创新计划项目(201811)。

摘　　要：针对现行桥梁承载能力评定方法难以适用于特大跨径悬索桥的情况,以洞庭湖大桥荷载试验为基础,参考现行规范,对特大跨径悬索桥荷载试验测试项目、结构受力及校验系数的取值范围进行研究。建议在进行特大跨径桥梁承载能力试验研究时,除进行规范规定的测试项目外,增加结构温度测试、支座滑移、特殊结构受力及关键部位状态等项目。理论与实测结果表明:洞庭湖大桥受力合理;大桥主梁挠度、应变等测试项目的校验系数最小值均小于规范取值范围,因此,建议可适当下调相关项目取值范围;大桥支座滑移实测校验系数为0.65~0.97,可为特大跨径悬索桥荷载试验支座滑移校验系数评定提供参考。The existing load bearing capacity evaluation methods are not applicable for suspension bridges with very long spans.Based on the load tests of Dongting Lake Bridge,studies were carried out to determine the items of load tests,load bearing capacity range and calibration coefficient for suspension bridges with very long spans,taking into account the reference items in the existing codes.It is suggested that the testing items,such as temperature of the structure,slippage of bearings,load bearing behavior of special components and state of key locations,should be added,besides the prescribed items in the existing codes.The theoretical calculation and measured results reveal that the load bearing capacity of Dongting Lake Bridge is rational,with the minimum values of calibration coefficents of testing items,like main girder deflection and strain,which are all below the values given in codes.Hence,it is suggested that the values of related items should be lowered.The measured slippage calibration coefficient of the bearings of Dongting Lake Bridge is within the range of 0.65~0.97,which can be used as references to evaluate the slippage calibration coefficient of bearings of the suspension bridge of similar type.

关 键 词：悬索桥 特大跨径桥梁 承载能力评定 主梁挠度 应变 支座滑移 校验系数 荷载试验 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U446.3[交通运输工程—道路与铁道工程]