波形耐候钢腹板与混凝土顶板结合部横向抗弯疲劳性能研究  

Fatigue Performance of Joints of Corrugated Weathering Steel Webs and RC Top Slabs Under Transverse Bending Moments

作　　者：张云 罗婷倚 杨涛[2,3] 陈筱彬[2] 陈明宇 ZHANG Yun;LUO Tingyi;YANG Tao;CHEN Xiaobin;CHEN Mingyu(Guangxi Beitou Highway Construction and Investment Group Co.,Ltd.,Nanning 530029,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China)

机构地区：[1]广西北投公路建设投资集团有限公司,广西南宁530029 [2]广西大学土木建筑工程学院,广西南宁530004 [3]工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《桥梁建设》2023年第6期47-54,共8页Bridge Construction

基　　金：广西重点研发计划项目(桂科AB19245017,桂科AB22080013)。

摘　　要：为了解波形耐候钢腹板组合箱梁桥中波形钢腹板-混凝土顶板结合部在横向弯矩下的疲劳性能,以飞龙大桥为背景,制作1个波形耐候钢腹板-混凝土顶板结合部试件,开展横向受弯疲劳试验。分析结合部试件的疲劳寿命、破坏形态、抗弯刚度变化情况等,并基于线性疲劳累积损伤理论,采用Eurocode 3和AASHTO规范公式评估结合部试件中相关细节的疲劳寿命。结果表明:波形耐候钢腹板-混凝土顶板结合部试件在最终疲劳破坏前经历了209.14万次的疲劳加载,可以满足结合部横向抗弯疲劳设计的要求;主要的疲劳损伤为连接波形钢腹板与钢翼缘的焊缝出现疲劳裂纹以及混凝土顶板的开裂;疲劳损伤的累积导致试件的抗弯刚度降至初始抗弯刚度的34.4%;采用Eurocode 3和AASHTO规范公式对结合部中细节进行疲劳寿命评估时,Eurocode 3规范公式计算所得的细节疲劳寿命更偏于保守。This paper studies the fatigue performance of the joints of corrugated weathering steel webs(CWSWs)and reinforced concrete(RC)top slabs in the composite box girder bridge under transverse bending moments.Based on the Feilong Bridge,a specimen was prepared for the transverse bending fatigue test.The fatigue life,failure mode,and the variation of flexural stiffness of the joints of CWSWs and RC top slabs were analyzed.Following the theory of linear cumulative fatigue damage,the fatigue life of related details of the specimen was evaluated using the formulas suggested in Eurocode 3 and AASHTO.The results demonstrate that the joints of CWSWs and RC top slabs in the specimen were finally subjected to 2091400 load cycles,indicating the joints meet the required fatigue performance under transverse bending moments.The fatigue cracks in the welded joints of the corrugated steel webs and the steel flanges as well as the cracks in the RC top slabs are considered the primary fatigue damages,and the cumulation of fatigue damages weakens the flexural stiffness of the specimen,with the latter reducing to 34.4%of the initial flexural strength.Compared with AASHTO,the formulas given in Eurocode 3 generate more conservative predictions of the fatigue life.

关 键 词：组合梁 波形耐候钢腹板 结合部 横向弯矩 裂纹扩展 疲劳寿命 疲劳损伤 疲劳试验 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U443.3[交通运输工程—道路与铁道工程]