剪切型建筑结构地震损伤整体识别方法

摘要

After big earthquakes,the national,local governments and owners need to carry out emergency relief and post-earth-quake reconstruction.It is important to estimate the seismic damage of large amounts of shear-type buildings.A holistic estima-tion method of structural seismic damage for shear-type buildings was presented in this study.First time-frequency analysis and fractal dimension were used to detect the seismic damages and locations,which was used to divide the whole structure into linear and nonlinear substructures.Nonlinear system identification method based on the joint extended Kalman and unscented Kalman filters were used to identify the linear and nonlinear substructures.The damage extent was obtained by using the identified hys-teretic curves and Park-Ang damage index.This method can provide a solid and reliable basis for post-earthquake emergency relief and reconstruction.The numerical simulation results showed that the proposed holistic assessment method can rapidly and accu-rately determine the damage locations.In addition,the estimated seismic damage extents and damage levels were close to the sim-ulated real values.%大地震过后，国家、地方政府及业主开展震后应急救援和恢复重建工作，迫切需要识别量大、面广的剪切型建筑结构的地震损伤。在已有研究基础上，提出了剪切型建筑结构地震损伤的整体识别方法：采用时频分析和分形维数刻画实现快速的损伤判定和定位，为进一步的结构损伤程度识别提供子结构划分依据；再采用基于扩展 Kalman 滤波和无迹 Kalman 滤波的非线性系统识别方法分别识别线性和非线性子结构，结合双参数损伤指标，识别结构的地震损伤程度和破坏等级，为震后应急救援和恢复重建提供坚实可靠的依据。数值模拟结果表明，本文提出的整体识别方法能快速、准确地判断损伤位置，识别的地震损伤程度和破坏等级非常接近模拟的真实值。