桥面连续结构分离长度对组合梁整体受力特性的影响  

Influence of Separation Length of Link-Slabs Structure on Overall Mechanical Behavior of Composite Beams

作　　者：万先军 林昱[2] 陶宣斌 刘安 吴鹏辉 苏庆田[3] WAN Xianjun;LIN Yu;TAO Xuanbin;LIU An;WU Penghui;SU Qingtian(Jiangxi Transport Investment Group Co.,Ltd.,Nanchang 330025,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100120,China;Department of Bridge Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]江西省交通投资集团有限责任公司,南昌330025 [2]中交公路规划设计院有限公司,北京100120 [3]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2024年第3期29-38,共10页Structural Engineers

摘　　要：为了明确组合梁中支点处钢梁与混凝土桥面板分离对大跨度恒载组合梁桥受力性能的影响,结合一实际工程,采用板壳-实体有限元方法,分析了中支点处桥面板与钢梁分离及完全结合情况下组合梁受力性能的区别,以及分离段长度变化对整体结构和中支点附近板件受力的影响。研究结果表明:在中支点附近一定范围设立分离段对组合梁整体刚度影响较小,但能减弱该处钢-混间连接刚度,有效减小中支点处混凝土上表面拉应力,进而减缓该处混凝土的开裂问题。对于60 m跨的组合梁,支点处钢-混分离段长度宜设为单跨跨径的11%左右。In order to clarify the influence of the separation of the steel beam and the concrete bridge deck at the middle fulcrum on the mechanical performance of a long-span dead load composite beam bridge,a practical project is analyzed and studied using the shell-solid finite element method.The mechanical performance differences of the composite beam under conditions of separation and complete connection of the bridge deck and the steel beam at the middle fulcrum are examined.Additionally,the influence of changes in the length of the separation section on the overall structure and the stress of the plate near the middle fulcrum is analyzed.The results show that setting a separation section within a certain range near the middle fulcrum has little effect on the overall stiffness of the composite beam.However,it can reduce the stiffness of the steelconcrete connection,effectively decrease the tensile stress on the upper surface of the concrete at the middle fulcrum,and thus alleviate the cracking problem of the concrete.For a 60m span composite beam,the length of the steel-concrete separation section at the fulcrum should be set to about 11%of the single span.

关 键 词：桥梁工程 组合结构 桥面连续 连接件 受力性能 合理范围 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]