大跨度公铁两用斜拉桥结构特性分析

在总结分析国内外已建大跨度铁路斜拉桥结构特征的基础上 ,针对我国拟建大跨度公铁两用斜拉桥的活载重和铁路设计车速高的特点 ,建立了大跨度公铁两用斜拉桥空间计算模型 ,并对其静、动力特性进行研究 .重点探讨了不同桥面体系对大跨度公铁两用斜拉桥静、动力受力特性的影响 ,并分析了结构几何非线性问题 .研究结果表明 :正交异性钢桥面板结合梁体系桥静、动力特性明显优于纵、横梁桥面体系桥 ,结构的几何非线性除对桥梁局部杆件的内力有一定影响外 ,对该桥大部分杆件内力影响较小

Analysis of Structural Characteristics of Long Span Combined Road with Railway Cable-stayed Bridges

At first,the structural features of long span railway cable-stayed bridges that have been constructed in the world are summarized.On the basis of the above,the three-dimensional model of the long span combined road and railway cable-stayed bridge is established.The effect of different deck systems on mechanical characteristics of the bridge is probed.Moreover,the geometry nonlinear of the bridge structure is investigated.The result of the research shows that the static and dynamic characteristics of the bridge with orthotropic steel deck are improved obviously.The geometry nonlinear of the bridge has little influence on the mechanic characteristics of structural members of the bridge except for some local components.