Fatigue Performance Evaluation for Welded Details in Orthotropic Steel Deck Bridges Using Multi-Scale Finite Element Method

作     者：Rongfeng Chen Changqing Miao 

作者机构：Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of EducationSoutheast UniversityNanjing210000China School of Civil EngineeringSoutheast UniversityNanjing210000China 

出 版 物：《Structural Durability & Health Monitoring》 (结构耐久性与健康监测（英文）)

年 卷 期：2020年第14卷第3期

页      面：205-228页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：This research has been supported by the National Natural Science Foundation of China(Grant No.51778135) the National Key R&D Program Foundation of China(Grant No.2017YFC0806001) the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20160207) Aeronautical Science Foundation of China(Grant No.20130969010) the Fundamental Research Funds for the Central Universities and Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(Grant Nos.KYCX18_0113 and KYLX16_0253). 

主　　题：Orthotropic steel bridge decks welded details multi-scale finite element model load test 

摘      要：In order to study the fatigue properties of rib-to-deck welded connection and rib-to-rib welded connection in orthotropic steel bridge decks,a multi-scale finite element model was set up to analyze the stress distribution characteristics and the load test was conducted on the Taizhou Yangtze River Bridge.Comparing the vehicle test results with the muli-scale finite element model results to verify the accuracy of the finite element simulation for the stress response of two welded details.The results indicated that The stress at the rib-to-deck welded connection and the rib-to-rib welded connection are the bending stress and the membrane stress,respectively;the stress response of the two welded connection has strong local characteristics;the lateral stress influence line of the two welded connection is relatively short and the length of the lateral stress influence line is greatly affected by the longitudinal ribs;increasing the thickness of the roof and longitudinal ribs can reduce the stress response and improve the stress performance of the heavy lanes.For the two welded details,the fatigue damage increment of the ordinary lane is greater than the heavy lane.The thickened roof and longitudinal ribs at the position of the heavy lane still cannot balance the fatigue damage caused by the heavy truck.Therefore,it is necessary to strictly control the fatigue effect of overloaded vehicles on steel box girders.