大跨度槽形钢箱梁-混凝土桥面板组合梁斜拉桥整体受力特性与截面刚度分配  

Overall Stress Characteristics and Section Stiffness Distribution of Large Span Cable⁃stayed Bridges with Trough Steel Box Girder⁃Concrete Bridge Deck Composite Girder

作　　者：李晓斌[1,2] 宋汶灵 谢明志[1,2] 张勇 杨灯 包杰 曾甲华[5] LI Xiaobin;SONG Wenling;XIE Mingzhi;ZHANG Yong;YANG Deng;BAO Jie;ZENG Jiahua(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;National Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 611756,China;Railway Engineering Research Institute,CARS,Beijing 100081,China;Sichuan Provincial Transportation Engineering Quality Supervision Station,Chengdu 614215,China;China Railway Fourth Survey and Design Institute Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学桥梁智能与绿色建造全国重点实验室,成都611756 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [4]四川省交通工程质量监督站,成都614215 [5]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2025年第1期7-13,共7页Railway Engineering

基　　金：中国国家铁路集团有限公司科技研究计划(K2018G017);中国铁建科技研究开发计划(16-C53)。

摘　　要：泉州湾跨海大桥主桥全联主梁采用槽形钢箱梁-混凝土桥面板组合结构,在高速铁路大跨度跨海斜拉桥中系首次采用。为探明槽形钢箱梁-混凝土桥面板组合主梁沿纵桥向的静力受力特点,建立主桥结构有限元分析模型,开展主桥在不同荷载组合作用下的静力响应分析,揭示刚度分配和一期压重对主梁受力的影响规律。结果表明:在不同荷载组合作用下,截面应力峰值均出现在主墩及辅助墩处;主墩处主梁截面承受的轴向压力及负弯矩最大,辅助墩处主梁截面承受的竖向剪力最大,负弯矩较大,该处钢箱梁截面的正应力水平最高,尤其是钢箱梁顶缘的正应力水平远高于主墩处。综合分析主梁截面刚度及其分布情况、内力和应力分布情况,以及一期压重混凝土板对主梁受力的影响,辅助墩处主梁截面为最不利受力位置,其受力状态更加需要关注。与普通组合梁相比,槽形钢箱梁-混凝土桥面板组合梁的构件在工厂预制,可以在海湾深水区装配化实现快速建造,在工程经济性、抗风性能、海湾深水施工条件、高速列车行车性能适应性等方面具有显著优势,应用前景广泛。The main bridge of the Quanzhou Bay Cross-sea Bridge adopts a combination structure of trough steel box girder-concrete bridge deck,marking the first application in a high speed railway large span cross-sea cable-stayed bridge.In order to investigate the static force characteristics of the trough steel box girder-concrete bridge deck composite girder along the longitudinal direction of the bridge,a structural finite element analysis model of the main bridge was established.Static response analysis of the main bridge under different load combinations was conducted,revealing the influence of stiffness distribution and initial dead load on the force of the main girder.The results show that under different load combinations,the stress peak values of the sections all appear at the main pier and auxiliary piers.The main pier bears the maximum axial pressure and negative bending moment on the main girder section,while the auxiliary piers bear the maximum vertical shear force and also have relatively high values of negative bending moment.The positive stress level of the steel box girder section at this location is the highest,especially the positive stress level at the top edge of the steel box girder is significantly higher than at the main pier.Considering the stiffness and distribution of the main girder section,internal force distribution,stress distribution,and the influence of the initial dead load concrete slab on the force of the main girder,it is observed that the main girder sections at the auxiliary piers are in the most unfavorable force positions,requiring more attention to their force state.Compared to ordinary composite girders,components of the trough steel box girder-concrete bridge deck composite girder are prefabricated in factories,enabling rapid construction in deep-water bays through assembly,with significant advantages in engineering economy,wind resistance,deep-water bay construction conditions,adaptability to high speed train operation,and promising prospects for wide applications.

关 键 词：槽形钢-混组合梁 斜拉桥 有限元法 静力行为 刚度分配 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]