某宋代砖塔结构整体损伤识别分析  

Analysis of Integrated Damage for a Masonry Pagoda Built in Song Dynasty

作　　者：卢俊龙[1] 李凯[2] 李嘉怿 LU J unlong;LI Kai;LI Jiayi(School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《防灾减灾工程学报》2019年第1期61-66,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51308455);陕西省自然科学基础研究计划项目(2015JM5206);陕西省博士后基金项目(2014)资助

摘　　要：为研究陕西省蒲城县崇寿寺宋代古塔的动力特性及结构整体损伤,应用动态测试系统对该塔在环境激励下的振动响应进行测试,对测试结果进行时域及频域分析,得到了结构沿水平方向振动的前3阶频率、振型及阻尼比;建立崇寿寺塔的有限元模型计算结构的动力特性,通过调整计算参数,使计算结果与测试结果一致,得到了结构的宏观等效弹性模量,依据该模量通过模态刚度定义损伤判别指标,对崇寿寺塔结构损伤进行评定。结果表明,当结构楼层弹性模量随高度增加逐渐增大时,数值计算各阶频率均与测试结果接近,表明崇寿寺塔结构宏观损伤在首层较为严重。因此,通过对比古塔动力特性测试结果与数值计算结果,可实现对结构整体损伤进行评定。To study the dynamic characteristics and integrated damage of the Chongshousi Pagoda in Pucheng County,Shaanxi Province,the vibration response of the pagoda was tested in dynamical testing equipments excited by ground random vibration.After analysis of the test results in time and frequency domains the first three order frequencies,vibration modes,and damp ratios were obtained.A finite element model of the Chongshousi Pagoda was built to calculate its dynamical characteristics.By adjusting calculation parameters the calculation results agreed with the test results,and the macro equivalent elastic modulus was acquired.Based on the modulus a damage identification index was defined by modal stiffness,and the structure damage of the Chongshousi Pagoda was evaluated.Results showed that when the elastic modulus increased with building height,the calculation results of each frequency approximated the test results.This indicated that the macro damage of the structure was relatively severe at the first floor.Therefore,the integrated damage of masonry pagodas can be evaluated by comparing results from dynamical tests to those from numerical calculation.

关 键 词：砖石古塔 动力测试 动力特性 损伤评估 

分 类 号：TU311.3[建筑科学—结构工程]