大跨桥梁风致抖振时域分析及在ANSYS中的实现.pdf

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大跨桥梁风致抖振时域分析及在 ANSYS 中的实现曾宪武,韩大建 9
文章编号:1003 - 4722(2004) 01 - 0009 - 04
大跨桥梁风致抖振时域分析及在 ANSYS 中的实现
曾宪武,韩大建
(华南理工大学建筑学院土木工程系,广东广州 510640)
摘要: 通过对准定常气动力模型[1 ]进行双变量泰勒展开,导出与自激力等价的 12 阶单元气
动阻尼矩阵和气动刚度矩阵,自激力以单元气动阻尼矩阵和单元气动刚度矩阵的形式在 ANSYS 中
以 Matrix27 矩阵输入,提出一套在 ANSYS 中实现大跨度桥梁抖振分析的简便方法。通过对一座大
跨度斜拉桥进行抖振时域分析,计算结果表明本文方法的计算结果与该模型的精确结果几乎完全
一致,充分说明了本文方法的正确性和实用性。
关键词: 长跨桥;抖振分析;时域法;有限元法
中图分类号: U441. 3 ;U448. 27 文献标识码: A
Time Domain Analysis of Wind Induced Buffet on Long Span
Bridges and Implementation of Analysis in ANSYS
ZENG Xian wu , HAN Da jian
(Department of Civil Engineering , Institute of Architectural Engineering , South
China University of Technology , Guangzhou 510640 , China)
Abstract : By applying two variable Taylor expansion to the quasi steady aerodynamic force model[1 ] , the
12 order element aerodynamic damping matrix and aerodynamic stiffness matrix equivalent to the self excited
force order are derived. The self excited forces are input in ANSYS in form of the element aerodynamic damp
ing matrix and aerodynamic stiffness matrix through Matrix 27. A simplified method is then established for
long span bridge buffeting analysis that can be easily implemented in a finite element program like ANSYS.
Through time domain analysis of buffeting on a long span cable stayed bridge , the calculat