大跨度桁式加劲梁悬索桥气弹模型等效设计

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振动与冲击 ›› 2009, Vol. 28 ›› Issue (9) : 171-174.

论文

大跨度桁式加劲梁悬索桥气弹模型等效设计

李春光陈政清张志田

作者信息 +

EQUIVALENT DESIGN OF AEROELASTIC MODEL FOR LONG-SPAN SUSPENSION BRIDGE WITH TRUSS STIFFENING GIRDER

Li Chunguang Zhang Zhitian Chen Zhengqing

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文章历史 +

摘要

针对大跨度桁架加劲梁悬索桥气弹模型设计中主梁等效刚度计算问题，本文以矮寨大桥为实例，建立不同长度空间桁架加劲梁节段模型有限元模型，通过悬臂梁位移法反算得到主梁的等效刚度特性，研究了不同荷载施加方式以及不同梁段长度对等效刚度特性的影响。在此基础上，进一步采用等效弹簧模拟桥塔及边主缆对主跨的约束刚度，简化了边主缆和桥塔，设计了刚性桥塔结合主缆串联等效弹簧的等效单主梁气弹模型，使气弹模型更加充分的反映主跨结构的风振响应。

Abstract

Aimed at the calculation for the equivalent rigidity of the truss stiffening girder in the aeroelastic model design of long-span suspension bridge with truss stiffening girder, in this paper, Aizhai bridge, which is a super-long –span suspension bridge across deep valley with single span, is taking as an example for investigation. In order to get the accurate equivalent rigidity characters of the truss-stiffening girder, finite element models of the truss-stiffening girder with different length were built, and then the theoretical formula for calculating the deformation of cantilever girder under concentrate force was adopted to evaluate the equivalent rigidity value of the truss girder. The analysis result indicted that the influence of local stress due to different load style disappeared at the section which is about two times section width distance from the load location, and the length of selected section model should be long enough to make the model have characters of single girder in both of vertical and cross directions. Furthermore, equivalent spring was designed to simulate the constraint effect of the tower and side main cable, based on the analysis of finite element model, equivalent aeroelastic model of single girder with rigid tower was built which dynamic characters showed good agreement with the prototype.

导出引用

李春光陈政清张志田 . 大跨度桁式加劲梁悬索桥气弹模型等效设计[J]. 振动与冲击, 2009, 28(9): 171-174

Li Chunguang Zhang Zhitian Chen Zhengqing. EQUIVALENT DESIGN OF AEROELASTIC MODEL FOR LONG-SPAN SUSPENSION BRIDGE WITH TRUSS STIFFENING GIRDER [J]. Journal of Vibration and Shock, 2009, 28(9): 171-174