ERE铺装钢桥面板疲劳扩展与疲劳寿命研究  

Study on Fatigue Extension and Fatigue Life of ERE Pavement Steel Bridge Panel

作　　者：王奎 吴文明 卢超 何蕾 李英豪 WANG Kui;WU Wen-ming;LU Chao;HE Lei;LI Ying-hao(Hubei United Transportation Investment and Development Co.,Ltd.,Wuhan,Hubei,430048;Beijing Gongke Bridge Technology Co.,Ltd.,Beijing 100088,China;School of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]湖北联合交通投资开发有限公司,湖北武汉430048 [2]北京公科固桥技术有限公司,北京100088 [3]福州大学土木工程学院,福建福州350108

出　　处：《公路交通科技》2024年第6期130-137,共8页Journal of Highway and Transportation Research and Development

基　　金：湖北省交通运输厅科技项目(2022-11-2-4)。

摘　　要：为研究ERE铺装对正交异性钢桥面板U肋与顶板焊接处疲劳细节的影响,针对某悬索桥实际的正交异性钢桥面板构造细节,利用等效结构应力理论研究其疲劳性能,并利用线弹性断裂力学理论进一步分析其疲劳裂纹扩展行为。首先,采用Abaqus软件分别建立原铺装和ERE铺装的正交异性钢桥面板节段有限元模型,基于等效结构应力法分析其疲劳细节疲劳性能以及在不同荷载位置下的等效结构应力;随后在此基础上运用FRANC.3D与Abaqus软件建立具有相同等效结构应力幅的三维顶板-U肋构造细节等效模型,并植入裂纹,对其结构局部模型的裂纹扩展性能进行对比分析。结果表明:该桥某跨跨中截面开裂模式以C.3开裂模式为主导,通过等效结构应力计算得疲劳寿命最短为427.1万次;对于采用ERE铺装加固后C.1,C.2裂纹开裂模式,在相同的裂纹扩展深度上,其应力强度因子都有着不同程度的降低,其平均寿命增加幅度为138.22%;当裂纹深度大于2 mm时原铺装结构C.3开裂模式的裂纹应力强度因子迅速增加,而采用ERE铺装加固后其应力强度因子幅值均低于原铺装结构且数值较为稳定,其平均寿命增加幅度为99.26%;ERE铺装加固后裂纹扩展寿命提升在75.13%~163.51%,平均增加幅度为125.23%。通过疲劳裂纹扩展寿命对比,可以认为ERE铺装能有效降低裂纹处的等效应力强度因子幅值,抑制裂纹的增长速率,从而提高构件的疲劳寿命。To investigate the influence of ERE pavement on the fatigue details of welding between U-ribs and top plate of orthotropic steel bridge panel,the equivalent structural stress theory was used to study the fatigue behavior of actual orthotropic steel bridge panel structure details of suspension bridge.The fatigue crack propagation behavior was further analyzed by using the theory of linear elastic fracture mechanics.Firstly,ABAQUS software was used to establish finite element models of orthotropic steel bridge panel segments for both original and ERE pavements.Based on the equivalent structural stress method,the fatigue detail fatigue performance and equivalent structural stress at different load positions were analyzed.Subsequently,FRANC.3D and ABAQUS software were used to establish the three-dimensional equivalent model of top plate U-rib structure with the same equivalent structural stress amplitude.The cracks were implanted to compare and analyze the crack propagation performance of local structural model.The result indicates that the cracking mode of mid span section of the bridge is dominated with C.3 cracking mode.The fatigue life is the shortest calculated through equivalent structural stress,which is 4.271 million times.For the crack propagation modes of C.1 and C.2 after reinforcement by using ERE pavement,the stress intensity factors decrease to varying degrees at the same crack propagation depth with an average life increase of 138.22%.When the crack depth is over 2 mm,the stress intensity factor with crack mode in the original pavement structure increases rapidly.However,after ERE pavement reinforcement,the amplitude of stress intensity factor is lower than that of original pavement structure,and the value is relatively stable with an average life increase of 99.26%.The crack propagation life after ERE pavement reinforcement is improved by 75.13%to 163.51%with an average increase of 125.23%.By comparing the fatigue crack propagation life,it can be concluded that ERE pavement can effectively reduce the

关 键 词：桥梁工程 疲劳性能 等效结构应力 应力强度因子 正交异性钢桥面板 ERE铺装 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]