重载与中强地震联合作用下的曲线独柱墩桥梁倾覆性分析  

Overturning behavior analysis of curved single column pier bridge under combinedaction of heavy load and moderate-strong earthquake

作　　者：殷新锋[1] 方亚茹 晏万里 黄胄 李茂侬 YIN Xinfeng;FANG Yaru;YAN Wanli;HUANG Zhou;LI Maonong(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;Guangxi New Development Transportation Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]长沙理工大学土木工程学院,长沙410114 [2]广西新发展交通集团有限公司,南宁530029

出　　处：《振动与冲击》2024年第11期31-40,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(52078057);湖南省自然科学基金资助项目(2023JJ30044);湖南省研究生科研创新项目(QL20220191);国家重点研发计划(2021YFB2600903)。

摘　　要：为探讨移动车辆和中强地震联合作用对曲线梁桥的抗倾覆影响,建立车-桥-地震分析模型,提出考虑地震作用的曲线梁桥车-桥耦合振动分析方法。以多跨曲线连续梁桥为研究对象,对比分析中强地震和重载车辆偏载组合作用下的支座反力和主梁倾覆时整体转角大小。研究地震动类型、峰值、车辆关键参数等因素对曲线梁桥倾覆稳定性的影响。结果表明:不同车辆和地震荷载组合会改变桥梁的受力情况,纵向间隔2 m的3辆100 t车辆以3 m/s速度行驶时,三跨曲线梁桥的倾覆最明显;综合考虑重载及地震联合作用,对抗倾覆性规范中的稳定系数计算公式进行了修正;分析了五跨曲线梁桥中墩支座偏心距对抗倾覆稳定系数的影响,计算结果表明中墩两相邻支座设置偏心时曲线桥最大抗倾覆系数为1.55。Here,to explore effects of combined action of mobile vehicles and moderate-strong earthquakes on anti-overturning of curved beam bridge,a vehicle-bridge-earthquake analysis model was established,and a vehicle-bridge coupled vibration analysis method considering seismic effects was proposed for curved beam bridge.Taking a multi-span curved continuous beam bridge as the study object,contrastive analysis was performed for support reaction and overall turning angle of main beam when it overturning under combined action of moderate-strong earthquake and overloaded vehicles in biased loading state.Effects of seismic motion types,peak values and key vehicle parameters on the overturning stability of curved beam bridge were studied.The results showed that different combinations of vehicle loads and seismic loads can change bridge stress situation,when three 100 t vehicles with a longitudinal spacing of 2 m are driving at a speed of 3 m/s,overturning of a 3-span curved beam bridge is most obvious;comprehensively considering combined action of heavy load and earthquake,the stability coefficient calculation formula in anti-overturning specification is revised;effects of eccentricity of middle pier support of a 5-span curved beam bridge on its anti-overturning stability coefficient are analyzed,the maximum anti-overturning stability coefficient of the bridge is 1.55 when 2 adjacent supports of its middle pier are set with eccentricity.

关 键 词：曲线梁桥 中强地震 移动荷载 有限元动力分析 抗倾覆稳定系数 

分 类 号：U211[交通运输工程—道路与铁道工程]