桥梁断面非线性自激气动力经验模型  

Empirical Mathematical Model for Nonlinear Motion-Induced Aerodynamic Force of Bridge Girder

作　　者：王骑[1] 廖海黎[1] 李明水[1] 马存明[1] 

机构地区：[1]西南交通大学风工程试验研究中心,四川成都610031

出　　处：《西南交通大学学报》2013年第2期271-277,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金重大研究计划培育项目(90815016)

摘　　要：为探讨桥梁断面的非线性自激气动力,基于平衡位置的Taylor级数展开式,建立了简谐运动下桥梁断面非线性自激气动力模型,获得了其复数和实数表达式,并说明了表达式中非线性气动参数的识别方法.该模型反映了简谐运动下桥梁断面非线性自激气动力的谐波叠加特性,可应用于桥梁的非线性气动稳定性分析.最后,应用该模型对某桥梁断面在简谐运动下的非线性自激气动力风洞试验时程数据进行了拟合.拟合结果表明,两者的误差在3%以内,验证了该模型的正确性.In order to probe into the nonlinear motion-induced aerodynamic force （MIAF） of bridge girder, based on Taylor expansion of the equilibrium position, a nonlinear MIAF mathematical model for bridge girder under harmonic motions was established, and the plural and real expressions were deduced. The identification method of nonlinear aerodynamic parameters in the expressions was introduced. This mathematical model includes the properties of nonlinear MIAF composing of multiple harmonic components, and can be applied to the analysis of nonlinear aerodynamic stability of bridges. An application shows that the maximal error between the wind tunnel test results of a streamline box girder and fitting ones based on the model is less than 3% to verify the validity of the mathematical model.

关 键 词：桥梁断面 非线性自激气动力 经验模型 风洞试验 

分 类 号：V211.24[航空宇航科学与技术—航空宇航推进理论与工程]