四线铁路钢箱混合梁弯斜拉桥设计研究  

Design of Curve Cable-Stayed Bridge with Steel-Box Hybrid Girder for Four-Track Railway

作　　者：罗世东[1] 饶少臣[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《中国铁道科学》2011年第5期32-37,共6页China Railway Science

摘　　要：根据四线铁路弯斜拉桥的受力特点,采用空间杆系有限元静力分析方法,围绕斜拉桥结构体系、桥梁整体刚度、收缩徐变、几何非线性等方面对其展开拉索、主梁、桥塔、基础的构造设计与研究。采用有限元仿真分析技术,研究正交异性桥面板的弯钢箱梁在受纵横向弯曲、剪力滞和扭转翘曲组合作用下的应力分布,进行钢箱梁与预应力混凝土梁的结合段、主梁与桥塔横梁固结、斜拉索上下钢锚箱的局部应力分析和构造研究。采用车桥耦合时变分析方法对其行车动力性能进行研究。采用反应谱及地震波时程分析方法同时对结构的抗震性能和抗震措施进行分析、研究。研究结果表明:四线铁路弯斜拉桥钢箱梁采用约3m的横隔板和腹板间距对改善主梁构造起到重要作用;良好的行车动力性能说明该桥采用1/900的挠跨比控制结构刚度较为合理;采用E型钢阻尼支座改善了桥梁的抗震性能。According to the mechanical characteristics of the curve cable-stayed bridge of four-track railway,the structure design and research on the cable,girder,bridge towers and foundation construction were launched by space bar finite element static analysis method in terms of the cable-stayed bridge architecture,the bridge stiffness,shrinkage and creep,and geometric nonlinearity etc.FEM analysis was used to study the stress distribution of the orthotropic steel box decks under the combined effect of the vertical and horizontal bending,shear lag and torsion warping.With FEM simulation,the local stress analysis and structure research were carried out on several aspects,such as the joint section of steel box girder and the prestressed concrete beam,the consolidation area between the main girder and the crossbeam of the bridge tower as well as the upper and lower steel anchor boxes for stay cable.Vehicle-bridge coupled time-varying analysis method was adopted to study the train running dynamic performance.Response spectrum method and seismic time history analysis method were used to study and analyze the seismic performance and seismic measures of the structure.Analyses show that about 3 m distance between the diaphragm and the web plates adopted for the steel box girder plays important role in improving the main beam structure in the curve cable-stayed bridge of four-track railway.Good train operation performance indicates that 1/900 deflection-span ratio adopted for the bridge to control the structural stiffness is more reasonable.E-type steel damping bearing has improved the seismic performance of the bridge.

关 键 词：弯斜拉桥 桥梁设计 四线铁路 钢箱混合梁 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]