Study on Damage and Strengthening Effects of Building Structures based on Vibration Tests using Impactor Machine

基于冲击机振动试验的建筑结构损伤与加固效果研究

基本信息

批准号：
13650614
负责人：
M0T0SAKA Masato
金额：
$ 2.62万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

In earthquake engineering, it is important to investigate the change of dynamic property of building structure resulting from damage during earthquake and strengthening by seismic reinforcement work. The change of natural period and vibration modes of soil-structure interaction system based on vibration tests make it possible to identify the damage and strengthening effects of each structural parts. In this project, first, damage and strengthening effects were investigated based on the forced vibration tests at an existing building before and after reinforcement work. Second, the shaking table testing technique of soil-structure interaction system based on the substructure method was developed and system identification of the model structure was performed.Up to the fiscal year 2001, the vibration tests using impactor machine and unbalanced-mass type excitor are performed at the actual 9 story RC building of Tohoku University. The vibration tests were performed before the reinforcement … More work and after the work. Based on the before-test, the damage detection technique was first discussed by comparing the vibration characteristics using the structural model which explain well those after the building's completion. The stiffness reduction factors were detected for each portion of the structural elements. Then, the seismic strengthening effect was discussed using the test results after the reinforcement. The same technique as the damage detection for the before-test was used to identify the stiffness increase for each portion of the structural elementsIn fiscal year 2002, the shaking table testing technique based on the substructure method was developed using a controlable electro-magnetic type shaking table. The testing method makes it possible to perform the vibration test of structure on assumed arbitrary soil conditions. First, the numerical simulation of the test was performed and verified the validity of the testing technique through the system identification of the used soil spring using the acceleration observation record. Then, the model tests of the different soil-structure system are performed using the testing device and the efficiency of the testing technique was confirmed through the system identification of the interaction system. The damage/reinforcement effects of the testing model can be evaluated based on the developed testing method. Less

在地震工程中，通过振动试验研究土-结构相互作用系统的固有周期和振动模式的变化，研究地震损伤引起的建筑结构动力性能的变化以及抗震加固工作具有重要意义。为了确定各结构件的损伤和加固效果，在该项目中，首先，基于现有建筑物加固前后的强迫振动试验来研究损伤和加固效果。开发了基于子结构方法的结构交互系统并进行了系统辨识到 2001 财年，在东北大学实际的 9 层 RC 建筑中使用冲击机和不平衡质量型激振器进行了振动测试。振动测试是在加固之前进行的。工作结束后，在前期测试的基础上，首先通过比较结构模型的振动特性来讨论损伤检测技术，该模型很好地解释了建筑物竣工后各部分的刚度折减系数。然后，使用加固后的测试结果讨论抗震加固效果。使用与测试前的损伤检测相同的技术来确定结构元件各部分的刚度增加。2002财年，进行了振动台测试。利用可控电磁式振动台开发了基于子结构法的技术，该测试方法使得在假设的任意土壤条件下进行结构振动试验成为可能。测试技术的有效性通过利用加速度观测记录对所用土弹簧进行系统辨识，然后利用测试装置对不同土-结构系统进行模型试验，并通过交互系统的系统辨识证实了测试技术的有效性。可以根据开发的测试方法来评估测试模型的损坏/加固效果。