桥梁风振试验颤振导数识别的Ibrahim时域优化研究  

Optimized Method for Extracting Fremitus Derivative Based on Ibrahim Method

作　　者：杨转运[1,2] 刘会[2] 张金梅[2] 刘鹏[2] 王羽[3] 

机构地区：[1]重庆大学土木工程学院,重庆400044 [2]四川建筑职业技术学院,德阳618000 [3]重庆交通大学土木建筑学院,重庆400074

出　　处：《武汉理工大学学报（交通科学与工程版）》2009年第5期908-910,915,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目(批准号:50778185);重庆市自然科学基金项目(批准号:2007BB6132)资助

摘　　要：基于R.H.Scanlan提出的自由振动法求解桥梁颤振导数实验量很大,且在提取交叉导数的过程中,一方面要求模型的竖向运动和扭转运动在所有的风速下都具有相同的频率比和阻尼比是很难达到的,另一方面非耦合导数的识别误差将带到耦合导数中.文中基于Ibrahim时域的改进方法,应用变尺度优化算法进行提取桥梁断面的全部颤振导数,研究结果表明应用此方法来解决非线性参数辨识问题比最小二乘法好.The experimental amount for solving fremitus derivative of bridge by free vibration method which was brought up by R. H. Scanlan is very large, and in process of extracting cross derivative it is difficult that frequency ratio and damping ratio of vertical motion and torsional motion of model is same in all wind speed. Besides, the discriminating error of uncoupled derivative will be in coupled derivative. The paper is an improved method based on Ibrahim Time Domain. Extracting all fremitus derivative of bridge sections by variable scale optimized method showed that solving identification of nonlinear parameters by this method was better than least square method.

关 键 词：自由振动法 颤振导数 优化 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]