抢险车对92m跨度复合材料桁架桥动态响应的影响  

Influence of emergency vehicle on dynamic response of 92 m span composite truss bridge

作　　者：孙泽阳[1] 刘阳[1] 杨俊锋 吴必涛[3] 赵启林[4] SUN Zeyang;LIU Yang;YANG Junfeng;WU Bitao;ZHAO Qilin(Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education,Southeast University,Nanjing,Jiangsu 211189,China;Guangzhou Metro Design and Research Institute Co.,Ltd.,Guangzhou,Guangdong 510010,China;State Key Laboratory of Rail Transit Infrastructure Performance Monitoring and Support,East China Jiaotong University,Nanchang,Jiangxi 330013,China;School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京211189 [2]广州地铁设计研究院股份有限公司,广东广州510010 [3]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013 [4]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《江苏大学学报（自然科学版）》2024年第3期346-353,共8页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52178120);中央高校基本科研业务费资助项目(2242022k30030)。

摘　　要：为研究大跨径桁架式纤维增强复合材料(FRP)应急抢修桥梁成桥后的动力性能,基于导梁推送施工92 m跨度的FRP桁架桥模型,编制FRP桁架桥的车桥耦合算法,研究抢险车辆的车速、质量及路面不平顺对FRP桁架桥的跨中竖向位移、竖向加速度和关键杆件轴向应力等指标的影响.结果表明:路面越不平顺,车辆对桥梁结构的冲击作用越大,且路面等级对竖向位移的影响大于对关键杆件轴向应力的影响;车速为20~50 km/h时,车速变化对冲击系数影响较小,但车速超过50 km/h时,车速的影响逐渐增大;车辆质量对桥梁各项指标动力响应的峰值曲线呈线性增大趋势.当车辆质量为2.80×10^(4)kg,车速30 km/h时,最大跨中竖向位移为167 mm,未超过抢修桥梁位移限值(L/120),表明该桥梁的设计可以满足抢险的通行要求.To investigate the dynamic performance of long-span truss fiber reinforced polymer(FRP)bridge after repairing completion,the 92-meter-span FRP truss bridge model was established based on guide girder pushing.The vehicle-bridge coupling algorithm of long-span composite truss bridge was compiled to analyze the effects of speed,vehicle weight and road surface roughness on the mid-span vertical displacement,vertical acceleration and key member stress of the FRP truss bridge.The results show that the more uneven the road surface is,the greater the impact of the vehicle on the bridge structure is.The vertical displacement is more affected by the road surface level than that by the member stress.In the speed range from 20 km/h to 50 km/h,the impact coefficient is less affected by the speed change.When the vehicle speed exceeds 50 km/h,the influence of speed change on the impact coefficient is gradually increased.The peak curve of vehicle mass to bridge dynamic response shows linear increasing trend.When the vehicle mass is 2.80×10^(4) kg with vehicle speed of 30 km/h,the maximum mid-span vertical displacement is 167 mm,which does not exceed the military emergency bridge displacement limit(L/120),indicating that the bridge design can meet the emergency traffic requirements.

关 键 词：纤维增强复合材料桁架桥 车桥耦合 位移接触法 动态响应 路面不平顺 

分 类 号：TU323.4[建筑科学—结构工程]