正交异性钢桥面板纵隔板构造参数对疲劳受力特征影响  

Influence of Structural Parameters of Orthotropic Steel Bridge Deck Longitudinal Clapboard on Fatigue Stress Characteristics

作　　者：高玉强 吉伯海[1] 曹雪坤 傅中秋[1] GAO Yuqiang;JI Bohai;CAO Xuekun;FU Zhongqiu(College of Civil and Transportation Engineering,Hohai University,Nanjing,China,210098)

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第4期690-698,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2017YFE0128700)。

摘　　要：目的研究斜拉桥纵隔板构造参数对正交异性钢桥面板受力性能的影响,为钢箱梁实桥养护提供参考。方法参照苏通大桥尺寸利用ABAQUS建立钢桥面板节段模型,分析了横隔板围焊端和顶板-U肋焊缝两处的最不利荷载工况,基于最不利荷载工况提取各节点处正应力幅来研究斜拉桥纵隔板形式和厚度对钢桥面板疲劳细节的影响。结果与纵隔板紧邻U肋中,U肋两侧横隔板焊趾处应力幅相差较小,而靠近纵隔板侧顶板-U肋焊缝、围焊端U肋焊趾处应力幅小于远离侧;采用实腹式纵隔板会使得顶板-U肋焊缝处应力幅下降,但会导致横隔板围焊端细节处应力幅上升;纵隔板厚度增加能降低顶板-U肋焊缝处应力幅,对横隔板围焊端细节影响较小。结论实腹式纵隔板能够降低紧邻U肋中顶板-U肋焊缝处应力幅,实桥建议可适当降低该部位的检测频率。In order to study the influence of longitudinal clapboard parameters on the mechanical performance of orthotropic steel deck of cable-stayed bridge,and the maintenance reference of steel box girder real bridge was provided.According to the size of Su-Tong Yangtze River Highway Bridge,the segment model of steel deck was established by ABAQUS.The most critical loading conditions of the deck-to-rib welds and the diaphragm-to-rib welds were defined.Based the most critical condition,the effects of the form and thickness of longitudinal clapboard on fatigue details were studied by extracting the normal stress amplitude at each node.The results showed that among the u-ribs adjacented to the longitudinal clapboard,the difference of stress amplitude at diaphragm weld toe on different sides of u-rids is small,the stress amplitude of the deck-to-rib welds and the u-rib weld toe of the diaphragm-to-rib welds near the longitudinal clapboard is less than that far away.Using solid abdominal longitudinal clapboard will reduce the stress amplitude of deck-to-rib welds and improve the stress amplitude of diaphragm-to-rib welds.The increase of longitudinal clapboard thickness can reduce the stress amplitude at the deck-to-rib welds,and has less effect on the diaphragm-to-rib welds.Based on the above results,reducing the detection times of cracks at the deck-to-rib welds is recommended.

关 键 词：斜拉桥 正交异性钢桥面板 纵隔板 疲劳应力 

分 类 号：TU391[建筑科学—结构工程] U441.4[建筑科学—桥梁与隧道工程]