基于可靠度分析的箱梁桥抗倾覆监测与评估  

Monitoring and Evaluation of Overturning Resistance of Box Girder Bridges Based on Time-varying Reliability Analysis

作　　者：闫兴非 余学文 淡丹辉[2] 张凯龙 YAN Xingfei;YU Xuewen;DAN Danhui

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125 [2]同济大学土木工程学院桥梁工程系,上海200092

出　　处：《上海公路》2019年第3期22-27,M0002,M0003,共8页Shanghai Highways

基　　金：国家重点研发计划(2017YFF0205600);住房和城乡建设部研究开发项目(K92018111);上海市科委科研项目(17DZ1204303)

摘　　要：近年来,箱梁桥倾覆事故频发,引起研究者的广泛关注。研究从桥梁监测的角度出发,分析了基于抗倾覆稳定系数的交通荷载监测技术路线和基于支座转角控制的结构响应监测技术路线,并据此来判断识别桥梁倾覆风险的可能性。针对后者,给出了一种简单可行的结构支座位移监测方案,在此基础上,提出了一种由支座转角控制的桥梁抗倾覆可靠度评估方法,并进一步考虑了橡胶材料老化对支座转动性能的影响,建立了支座容许转角的时变效应数学模型,使其具备进行在线监测环境下的时变可靠度评估能力。最后,将上述方法应用于上海市同济路EN匝道桥进行抗倾覆分析,说明了该方法的可行性和有效性。In recent years, the overturning accidents of box girder bridges have occurred frequently, causing widespread concern of considerable researchers. From the perspective of bridge structure monitoring, this paper puts forward two technical routes for evaluating the risk of over-turning possibility of a bridge. One is called traffic loads monitoring based on the anti-overturning stability coefficient, and the other is called structural response monitoring based on the control of the bearing's rotational angle. Aiming at the later, a simple and feasible monitoring scheme is presented depending on the structural response-the displacement of the measured points on both sides of the bearings. And then, a method to assess the anti-overturning reliability of the bridge is proposed. The influence of the aging of the rubber material on the rotation performance of bearing is further considered and the mathematical model of the time-varying effect of the bearing's allowable rotational angle is established. Finally, the method above is applied to the anti-overturning analysis of the EN ramp bridge at Tongji Road in Shanghai, which demonstrates the feasibility and effectiveness of this method.

关 键 词：箱梁桥 抗倾覆 可靠度 支座脱空 桥梁监测 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]