随机车流下波形腹板组合箱梁桥疲劳寿命评估  

Fatigue life assessment of waved web composite girder bridge under random traffic flow

作　　者：李喜梅[1,2] 杨海权 张冬兵 常博 母渤海 LI Ximei;YANG Haiquan;ZHANG Dongbing;CHANG Bo;MU Bohai(Western Civil Engineering Disaster Prevention and Mitigation Engineering Research Center of the Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China;Institute of Earthquake Prevention and Disaster Reduction,Lanzhou University of Technology,Lanzhou 730050,China;Jiangxi Long Bridge and Tunnel Research and Design Institute Co.,Ltd.,Nanchang 330200,China;China Municipal Engineering Northwest Design and Research Institute Co.,Ltd.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050 [2]兰州理工大学防震减灾研究所,兰州730050 [3]江西省长大桥隧研究设计院有限公司,南昌330200 [4]中国市政工程西北设计研究院有限公司,兰州730050

出　　处：《交通科技与经济》2024年第6期23-30,共8页Technology & Economy in Areas of Communications

基　　金：国家自然科学基金项目(52268028);江西省交通厅科技项目(2022H0021)。

摘　　要：为研究运营期内波形腹板组合梁桥的疲劳安全问题,基于WIM系统实测车辆荷载数据对桥梁疲劳寿命进行评估。利用某高速公路桥梁WIM系统实测车流数据建立随机车流模型,运用ANSYS有限元软件分析随机车流作用下波形腹板组合箱梁桥的疲劳应力,通过疲劳寿命评估方法评估波形腹板组合箱梁桥疲劳寿命,并探讨车流量变化对疲劳寿命的影响。研究结果表明:在随机车流作用下,波形腹板组合箱梁桥钢底板与波纹腹板焊缝相同折角处的应力值内侧比外侧大,导致内侧的疲劳损伤比外侧大,疲劳寿命较短;车流量变化对桥梁的疲劳损伤影响较大,随运营时间的增长,桥梁的疲劳寿命快速下降。因此,在运营期内需对桥梁运行车辆采取一定的限流限载措施。In order to study the fatigue safety of composite girder bridge with corrugated webs during the operation period,the fatigue life of the bridge was evaluated based on the measured vehicle load data of WIM(Weight in Motion)system.The random traffic flow model is established by using the measured traffic flow data of WIM system of a highway bridge.The fatigue stress of corrugated web composite box girder bridge under random traffic flow is analyzed by using ANSYS finite element software.The fatigue life of corrugated web composite box girder bridge is evaluated by fatigue life evaluation method,and the influence of traffic flow change on fatigue life is discussed.The results show that under the action of random traffic flow,the stress value at the same angle between the steel plate and the corrugated web weld of the corrugated web composite box girder bridge is larger on the inner side than on the outer side,resulting in larger fatigue damage on the inner side than on the outer side and shorter fatigue life.At the same time,the change of traffic flow has a great influence on the fatigue damage of the bridge.With the increase of operation time,the fatigue life of the bridge decreases rapidly.Therefore,it is necessary to take certain current and load limiting measures for bridge operation vehicles during the operation period.

关 键 词：桥梁工程 疲劳寿命评估 波形腹板组合箱梁桥 随机车流 车流量变化 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]