古塔结构整体性损伤检测的微动测试技术应用研究  

Application of microtremor technology on integrated damage detection of ancient Pagoda structures

作　　者：范岩旻 李森曦 彭冬[1] 车爱兰[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《应用力学学报》2016年第1期61-66,180-181,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11372180)

摘　　要：在古建筑结构保护中,无损伤或微损且便携快速的高精度检测手段以及识别结构损伤的方法一直是重要的研究课题。本文基于古塔结构的动力特性,建立了基于模态信息的古塔结构损伤识别方法,采用损伤前后结构的低阶模态信息差异进行损伤定位和损伤程度评估。首次用将该方法对典型砖木混合古塔结构——上海市松江方塔开展了研究。采用微动测试技术,获取损伤结构的动力特性参数(模态信息),采用数值方法计算获取结构未损伤模型的特征值。对测试参数及计算参数进行统一物理量的数据归一化处理后,利用结构的单元刚度矩阵作为诊断项,根据损伤表征向量进行了损伤定位及损伤程度评估。通过微动测试技术评价的结构整体损伤与以往的历史记录及测绘结果进行比较,得出结构7层、8层刚度损失最大,达到0.56,其次为第9层,达到0.78。In the structural protection of ancient architectures, a key research subject is to use a precise non-destructive detection method that can identify structural damage very conveniently and efficiently. Based on dynamic characteristics of ancient Pagodas, a method to identify its structural damage is established by using modal information. It locates damages and evaluates its degree from the differences between modal information of structure in lower order before and after damaged. As a case study of Shanghai Fang Pagoda in Songjiang area, Shanghai city, microtremor technology is used to obtain dynamic characteristics parameters(modal information) of damaged structures. And eigenvalues of undamaged structure models are obtained with the calculation of FEM. After normalized soring of data with unified quantities including testing parameters and calculation parameters, element stiffness matrix of the structure is calculated as diagnosis item to locate damage and assess its degree on the basis of representation vector quantity of damages.

关 键 词：古塔结构 微动测试 固有模态 整体性损伤 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]