基于模型试验的城市轨道交通正交异性钢桥面板应力特征研究  

Study on Stress Characteristics of Orthotropic Steel Deck of Urban Rail Transit Based on Model Test

作　　者：曾勇[1,2] 李学钦 张路 况杨 李强 ZENG Yong;LI Xueqin;ZHANG Lu;KUANG Yang;LI Qiang(State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China;Mountain Bridge and Materials Engineering Research Center of Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China;Traffic Planning and Technology Development Centre of Chongqing Fuling District, Chongqing 400074, China;China Metallurgical Construction Engineering Group Co. Ltd.,Chongqing 400084,China)

机构地区：[1]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074 [2]重庆交通大学山区桥梁结构与材料教育部工程研究中心,重庆400074 [3]重庆市涪陵区交通规划与技术发展中心,重庆408000 [4]中冶建工集团有限公司,重庆400084

出　　处：《国防交通工程与技术》2022年第2期5-10,共6页Traffic Engineering and Technology for National Defence

基　　金：重庆市留学人员回国创业创新支持基金(cx2018113,cx2020117);山区桥梁结构与材料教育部工程研究中心开放基金资助项目(QLGCZX-JJ2017-5);省部共建山区桥梁与隧道工程国家重点实验室开放基金(CQSLBF-Y14-3,CQSLBF-Y16-10)。

摘　　要：在轨道交通桥梁实际运营过程中,由于桥面板的结构特点以及轨道车辆荷载大小的时变性,桥面板往往处于较为复杂的时变三轴应力状态,现行规范并不能很好地指导其设计与施工,针对轨道桥梁桥面板的深入研究也较为匮乏。为了对其应力特征进行研究,借助正交异性钢桥面板足尺节段模型疲劳加载试验得到了桥面板、U肋及横隔板处的测点应力数据,通过比较不同路径上和不同位置处的试验数据总结出桥面板在桥梁服役阶段各关注细节的应力变化规律。试验结果表明桥面顶板测点的应力水平随着与U肋的距离愈来愈远而大幅降低,U肋处测点距桥面顶板的距离大小对该处应力水平的影响更大,横隔板处测点的应力最大值均出现在桥面板-横隔板-U肋三者共同连接区域。针对各连接部位较多处于应力集中状态这一普遍现象提出在U肋内增设内隔板的改进措施,ANSYS仿真模拟结果表明当内隔板采用三面围焊时可以有效改善应力集中现象。In the actual operation of railroad bridges,due to the structural characteristics of the deck plate and the time-varying magnitude of the rail vehicle loads,the deck plate is often in a complex time-varying triaxial stress state,and the current code is not a good guide for its design and actual construction phase,and there is a lack of in-depth research on the deck plate of railroad bridges.In order to study the stress characteristics,this paper obtained the stress data at the deck plate,U-rib and cross-section with the help of orthotropic anisotropic steel bridge panel full scale section model fatigue loading test,and compared the experimental data at different paths and locations to summarize the stress change law of the deck plate in the bridge service phase in each detail.The test results show that the stress level of the top deck measurement point decreases significantly with the distance from the U-rib,the distance of the U-rib from the top deck has a greater influence on the stress level,and the maximum stress value of the measurement point at the cross-sectional plate appears in the joint area of the bridge deck,cross-sectional plate and U-rib.Finally,for the common phenomenon that each connection part is more in the stress concentration state,the improvement measure of adding an inner spacer in the U-rib is proposed,and the results of ANSYS simulation show that the stress concentration phenomenon can be effectively improved when the inner spacer is welded around three sides.

关 键 词：城市轨道交通 正交异性钢桥面板 局部应力 移动荷载 横隔板 U肋 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]