三索面三主桁斜拉桥设计参数研究  

作　　者：罗娜[1] 郑鹏飞[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《黑龙江科技信息》2009年第24期246-247,126,共3页Heilongjiang Science and Technology Information

摘　　要：三主桁三索面斜拉桥是一种高次超静定结构,其受载后的内力分配具有空间特性,受力复杂,设计参数对其受力特性的影响值得研究。本文通过建立大型有限元空间模型对其进行了受力分析,通过改变主要设计参数(横梁刚度,平联刚度,K撑),讨论了三主桁结构主要设计参数对其受力特性的影响。通过对比分析发现:横梁刚度对主桁受力影响较小,但平联刚度的影响较大,在四倍于原平联面积下,个别中主桁弦杆的轴力变化超过500%,因此设计中对于平联的影响应加以重视,另外增加K撑可以作为一种有效的改善措施。The cable-stayed bridge with three-plane and three-truss is a statically indeterminate structure, and has a complicated spatial character for its mechanical distributing, so the research about the design variables on the mechanics is deserved. In this paper, the mechanical analysis was taken by the building of spatial finite model, and the effects of the main design variables on the mechanics was discussed. Based on the contrary anlysis, a discovery is found： The stiffness of the cross beam has little effects on the mechanics of the main truss, however, the stiffness of lateral bracing has a large effect on it, the variation of the axial force for some main mid-truss is greater than 500% as the four times area as the initial area, therefor, the effect of lateral bracing should be taken into a greater account. In addition, the addtion of K bracing has a effective improvement for the mechanics.

关 键 词：三索面 三片桁架主梁 斜拉桥 设计参数 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U448.22[交通运输工程—道路与铁道工程]