摘要
结合断面的颤振导数,采用阶跃函数对桥梁断面自激力进行模拟,并对模拟准确性进行了分析与校核;推导出时域颤振动力有限元分析中自激力的递推表达式。基于阶跃函数拟合气动力,利用APDL语言在ANSYS中实现了颤振时域分析;以一简支梁为例,介绍了在ANSYS中实现颤振时程分析的过程。数值算例计算结果和相关文献报道基本一致。研究表明:利用ANSYS的二次开发平台进行桥梁气动稳定性能的时域分析是可行的,该方法可提高桥梁颤振分析或颤抖振理论分析效率,降低自主开发大型软件过程中的算法错误或疏漏所带来的风险。
On the basis of sectional flutter derivatives,the indicial functions are firstly adopted in this literature to simulate the self-excited aerodynamic forces of bridge girder section,and,of which the simulation veracity is inspected.Then the recursive algorithm of bridge section self-excited aerodynamic forces,which is indispensable in the dynamic finite element analysis procedure,is deduced.Based on simulated self-excited aerodynamic forces,the time-domain flutter analysis is achieved in ANSYS in virtue of the embedded APDL language wherein.At last,a numerical example — a simple supported beam is selected to verify this method in time-domain using ANSYS software.Numerical example is in good accordance with what reported in the listed references.What presented in this paper shows it is feasible to conduct the time-domain investigation of aerodynamic stability of a bridge based on secondary development of the ANSYS program,which is capable of improving the efficiency of bridge flutter analysis or flutter-buffeting analysis,reducing the risk of algorithmic error or careless omissions involved in self-developing large software.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2012年第2期173-178,共6页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家自然科学基金资助项目(90915002
50708036
50738002)
关键词
阶跃函数
颤振
时域分析
indicial function
flutter
time-domain analysis
