大跨桥梁抖振时域分析的程序化方法  

Computerized Approach for Buffeting Time-Domain Analysis of Long-Span Bridge

作　　者：胡亮[1] 李黎[1] 彭元诚[1] 樊剑[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《中国公路学报》2006年第6期59-64,共6页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200431800024)

摘　　要：介绍了一套以通用有限元软件为平台进行抖振时域分析的程序化方法,重点分析了作用在有限元模型加载节点上的随机抖振荷载的模拟方法。依照改进的Deodatis谱表示法给出了脉动风速场模拟程序的流程图。基于准定常假定,推导了便于有限元软件加载的脉动风速和抖振力时程之间的简化转换公式。按照该程序化方法,使用ANSYS软件对龙潭河特大桥进行了风致抖振时域分析,验证了该方法的实用性和有效性。A computerized approach by using general finite element analysis （FEA） software to carry out buffeting time-domain analysis was proposed. The simulation method of stochastic buffeting load applied in finite element model loading nodes was described in detail. The flow chart of the program for the simulation of random turbulent wind velocity fields was given by using Deodatis-proposed spectral representation method. A group of simplified formulas for transforming turbulent wind velocities to time-histories of the buffeting force were derived on the basis of quasi-steady hypothesis, which was convenient to apply the force immediately by using general FEA software. Finally, according to the computerized approach, a buffeting time-domain analysis was performed on the Longtan River Bridge by ANSYS software. The practicability and validity of the approach were verified.

关 键 词：桥梁工程 桥梁抖振 程序化方法 时域分析 脉动风速 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]