刚构体系中承式梁拱组合桥空间受力研究  

Research on Spatial Mechanical Characteristics of Rigid-Frame Half-Through Multi-Arch Bridge of a Girder-Arch Composite System

作　　者：易云焜[1] 徐梦莹 汪阳 林春乾 张雅俊 YI Yunkun;XU Mengying;WANG Yang;LIN Chunqian;ZHANG Yajun(Xiamen University of Technology,Xiamen 361000,China;China Construction Fourth Engineering Division Installation Engineering Co.,Ltd.,Guiyang 550009,China;Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology(Chang′an University),Xi′an 710064,China)

机构地区：[1]厦门理工学院,福建厦门361000 [2]中建四局安装工程有限公司,贵州贵阳550009 [3]长安大学旧桥检测与加固技术交通运输行业重点实验室,陕西西安710064

出　　处：《世界桥梁》2025年第2期51-57,共7页World Bridges

基　　金：长安大学中央高校基本科研业务费专项资金项目(JQJJ202405)。

摘　　要：为给超宽多跨刚构体系中承式梁拱组合桥的简化分析和优化设计提供理论基础,以漳州马洲大桥为背景,研究空间受力特性。建立该桥有限元模型,研究超宽多跨刚构体系中承式梁拱组合桥的空间受力特性;针对影响空间受力的3个关键参数(大横梁横向刚度、拱肋横桥向位置和系杆张拉力),应用参数分析和力学简化分析2种方法得到各参数合理取值,并将数值分析和力学分析的结果相互验证,分析桥宽对结构稳定的影响。结果表明:多跨刚构体系中承式梁拱组合桥会在墩底产生横桥向反力、顺桥向力矩和扭矩等空间力;大横梁和主纵梁的横向刚度比与其长度比成反比例时为其合理横向刚度,使空间力均接近于0;拱肋至道路中心线的距离为2/3半桥宽时,墩底横桥向反力、顺桥向反力矩和竖向反力矩等空间力接近为0,为拱肋的横桥向合理位置;系杆张拉力除应考虑拱肋水平推力,还应考虑桥墩横桥向力矩,并在二者间进行综合平衡;桥宽增加后桥梁结构一阶失稳系数减小,但对一阶失稳模态和竖向失稳荷载基本无影响。This paper numerically investigates the spatial mechanical characteristics of the very-wide,rigid-frame,half-through,multi-arch bridge of a girder-arch composite system.The Mazhou Bridge in Zhangzhou is used as a case.The key parameters analyzed include the lateral stiffness of main floor beams,the configuration of arches and tensions of ties,and the rational values of these parameters are evaluated via parametric analysis and simplified mechanical analysis,respectively.The numerical analysis and the mechanical analysis were compared to figure out the effect of deck width on the stability of the bridge structure.It is concluded that in the rigid-frame,half-through,multi-arch bridge,multiple spatial forces occur at the pier bottom,including the transverse reaction forces,longitudinal moment and torsional moment.When the transverse stiffness ratio of the main floor beam and the main longitudinal beam is inversely proportional to the length ratio of the two,the bridge structure will boast a rational lateral stiffness,while the spatial forces all approximating 0.When the distance of the arch rib to the centerline of the carriageway is 2/3 of the half deck width,the spatial forces,such as transverse reaction forces,longitudinal moment and torsional moment,approximate 0,which is regarded the effective configuration of arches.The tensions of ties must be in proportion to the horizontal reaction forces of the piers and the transverse moments of the piers.Increasing the deck width leads to the reduction of the first-mode instability coefficient,but exerts minor influence on the first-mode instability and instability loads.

关 键 词：中承式梁拱组合桥 刚构体系 大横梁横向刚度 拱肋横桥向位置 系杆张拉力 参数分析 有限元法 

分 类 号：U448.52[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]