剪切框架在未知地震作用下的识别方法及试验验证  

Identification Method for Shear Building Under Unknown Seismic Excitation with Experimental Validation

作　　者：许煌昊 刘朝[2] 何明煜[2] 雷鹰[2] 

机构地区：[1]浙江大学宁波理工学院土木工程与建筑分院,浙江宁波315100 [2]厦门大学建筑与土木工程学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2014年第6期824-827,共4页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(51178406)

摘　　要：针对框架结构的绝对加速度响应部分观测、地震作用未观测的情况,提出一种多层剪切框架结构诊断的方法.该方法先依次采用扩展卡尔曼估计和递推最小二乘法对1层以上结构的扩展状态向量和未知作用力进行递推;然后利用结构频率特征方程,对第1层的结构参数进行估计;最后基于数值求解一阶微分方程,识别未观测的地震作用.通过1个4层框架试验,表明该方法能够很好地识别出结构参数和地震输入.A method is proposed for the identification of multi-story shear buildings under unknown seismic excitation with partial observations of structural absolute acceleration responses.Based on sequential application of the extended Kalman estimator and the least squares estimation,structural parameters above the first story of a building can be identified.Then,structural parameters of the first story can be identified from the frequency equation.Finally,the unknown earthquake excitation can be identified via the numerical solution of a first-order differential equation.Lab experiments of a 4-story shear building on a shaking table test have validated that the proposed method can determine structural parameters and the earthquake excitation with satisfactory accuracy.

关 键 词：结构参数识别 未知地震力 扩展卡尔曼估计 最小二乘法 

分 类 号：TB122[理学—工程力学]