钢桁梁桥横梁与弦杆节点疲劳易损性分析  

Fatigue Vulnerability Analysis of Crossbeam and Chord Joint in Steel Truss Bridge

作　　者：李传喜 吉伯海[1] 姚悦[1] 傅中秋[1] LI Chuanxi;JI Bohai;YAO Yue;FU Zhongqiu(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学土木与交通学院,南京210098

出　　处：《武汉理工大学学报（交通科学与工程版）》2023年第1期142-147,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：文中建立全桥及局部有限元模型,通过施加标准车辆荷载,计算并对比不同工况及不同位置的横梁与弦杆节点的应力,得到节点疲劳易损部位及荷载最不利加载位置,并进一步研究得到节点局部受力特征.结果表明:端横梁与弦杆节点易出现疲劳损伤,且纵向活动支座处的节点最易出现疲劳损伤.横梁端部腹板上缘焊趾、连接角钢肢交线顶部易出现疲劳损伤.端横梁上翼缘与角钢之间的腹板间隙以面外变形为主,呈双向弯曲形态,腹板上缘焊趾主要受弯剪作用.The finite element model of the whole bridge and local part was established, and the stress of beam and chord joints in different working conditions and positions was calculated and compared by applying standard vehicle load. The fatigue vulnerable position and the most unfavorable loading position of the joint were obtained, and the local stress characteristics of the joint were analyzed by further study. The results show that the joint between the end beam and chord is prone to fatigue damage, and the joint at the longitudinal movable support is the most prone to fatigue damage. Fatigue damage is easy to occur at the top of the welding toe of the upper edge of the web at the end of the beam and the intersection line of the connecting angle steel limbs. The web gap between the upper flange of the end beam and the angle steel is mainly out-of-plane deformation, which is in a bidirectional bending shape, and the welding toe on the upper edge of the web is mainly subjected to bending and shearing.

关 键 词：钢桁梁桥 疲劳易损部位 腹板间隙 面外变形 受力特征 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]