特大跨桥梁正交异性钢桥面板疲劳性能研究  

Study on the fatigue performance of orthotropic steel bridge decks in ultra-long span bridges

作　　者：龚清玉 解程 刘中祥 曲春绪 白涌滔 GONG Qingyu;XIE Cheng;LIU Zhongxiang;QU Chunxu;BAI Yongtao(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Research Center of Steel Structure Engineering,Chongqing University,Chongqing 400045,China;School of Transportation,Southwest University,Nanjing,Jiangsu 211189,China;School of Civil Engineering,Dalian University of Technology,Dalian,Liaoning 116023,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学钢结构工程研究中心,重庆400045 [3]东南大学交通学院,江苏南京211189 [4]大连理工大学土木工程学院,辽宁大连116023

出　　处：《河北工业大学学报》2025年第1期32-41,共10页Journal of Hebei University of Technology

基　　金：国家重点研发计划青年科学家项目(2022YFB2602700);国家自然科学基金资助项目(52222807,52478302);重庆市杰青项目(CSTB2024NSCQ-JQX0027)。

摘　　要：随着我国交通基础设施的快速发展,桥梁作为关键枢纽,其全寿命周期内的服役性能对经济社会高质量发展具有重大影响。对于特大跨桥梁而言,疲劳振动导致的局部损伤问题日益突出。本研究以润扬大桥为原型,围绕在役特大跨桥梁正交异性钢桥面板的疲劳破坏机理和性能演化过程,建立多尺度模型,并进行了原尺寸疲劳振动试验研究。结果揭示了不同轮载工况下正交异性钢桥面板疲劳破坏均发生于U肋外侧的焊脚部位。根据试验破坏模式和疲劳寿命曲线,最不利工况为U肋焊缝上方,该因素对疲劳寿命影响超过30%。本研究结果将对特大跨桥梁的正交异性钢桥面板疲劳设计和评估提供科学依据,支撑了数字孪生模型和疲劳数据库的建立。With the rapid development of transportation infrastructure in China,as key hubs,bridges have a significant impact on the high-quality development of the economy and society in terms of their service performance in lifecycle.For ultra-long span bridges,the problem of local damage caused by fatigue vibration is becoming increasingly prominent.This study takes the Runyang Bridge as a prototype and focuses on the fatigue failure mechanism and performance evolution process of orthotropic steel bridge decks in service large-span bridges.A multi-scale model is established and fullscale fatigue vibration tests are conducted.The results have revealed that fatigue failure tends to occur at weld seam near the outside U-rib in orthotropic bridge decks regardless of loading protocols.Based on the experimental failure mode and life curve,the most unfavorable case for loading position is applied on U-rib weld seam,which has an impact of over 30%on the fatigue life reduction.This study will support the fatigue design and evaluation for digital-twin modeling and database collecting of orthotropic steel bridge decks in ultra-long span bridges.

关 键 词：特大跨桥梁 正交异性钢桥面板 高周疲劳试验 最不利工况 服役寿命分析 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]