东日本大地震后某校舍抗震加固改造与效果评估实验研究  

Study on Seismic Retrofitting and Effect Evaluation of a School Building after the Eastern Japan Earthquake

作　　者：李亮 大久保孝昭 杨建江 张大英 LI Liang;OHKUBO Takaaki;YANG Jianjiang;ZHANG Daying(School of Civil Engineering,Tianjin Ren′ai College,Tianjin 301636,China;Department of Architecture,Graduate School of Engineering,Hiroshima University,Hiroshima 7308511,Japan;School of Civil Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450000,China)

机构地区：[1]天津仁爱学院建筑工程学院,天津301636 [2]日本国立广岛大学工学研究科,日本广岛7308511 [3]郑州航空工业管理学院土木建筑学院,郑州450000

出　　处：《噪声与振动控制》2024年第3期246-252,共7页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51808511)。

摘　　要：2011年东日本大地震后,校舍建筑的抗震加固变得极为迫切。针对日本某校舍建筑的抗震加固工程展开计算分析及实验研究。首先阐述既有校舍建筑的结构特征及抗震鉴定结果,提出纵向采用钢支撑框架提高强度,首层横向新设剪力墙以及增厚楼梯间楼板的加固方案。随后,利用无线振动测试系统在校舍建筑抗震加固前后进行常时微动测试实验,分别从整体与局部角度分析加固前后校舍建筑加速度响应、固有周期以及振型等参数变化。最后,对比分析有限元计算及测试结果,阐述抗震加固方法及位置对原有建筑的性能影响,验证抗震加固方法的有效性。结果表明:采用钢支撑框架的加固方法有效提高既有校舍建筑的强度,加固后加速度响应值约降低至加固前的1/3,加固方法起到提高整体强度、改善刚度分布及结构整体性作用;固有周期以及加速度响应放大倍率的变化与该校舍抗震加固方法较吻合,表明基于振动测试的研究方法能够有效评估抗震加固措施的效果。研究成果可为既有校舍建筑的抗震加固方案选取及性能评估提供参考。Computational analysis and experimental study were performed on the strengthening of a school building in Japan after the earthquake in 2011 in eastern Japan.First of all,the structural characteristics and seismic appraisal results of the currently existing school buildings were expounded.Then,a strengthening scheme was proposed:the strength was improved by using a longitudinal steel braced frame and adding transverse shear walls on the first floor.Next,a wireless vibration test system was used to perform the microtremor determination experiments to the school building before and after the strengthening.Moreover,the changes of the parameters like the acceleration spectrum,inherent period,and vibration mode of the school building were analyzed from both global and local perspectives.Finally,the computational simulation and test results were comparatively analyzed,the seismic strengthening method and the influence of the strengthening position on the original building were expounded,and the effect of this seismic strengthening method was verified.Results show that the strengthening method with a steel braced frame can improve the strength of the existing school building,the acceleration response value after the strengthening declined to about 1/3 of that before the strengthening.The changes in the inherent period and the amplification factor of acceleration response accord with those of the seismic strengthening method for this school building,indicating that the research method based on the vibration test can effectively evaluate the strengthening effect of seismic strengthening work.The study results may provide a reference for the selection and evaluation of seismic strengthening schemes of the existing school buildings.

关 键 词：振动与波 校舍建筑 钢支撑框架 抗震加固 常时微动 结构计算 

分 类 号：TU311.3[建筑科学—结构工程]