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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，研究建筑结构在地震作用下的破坏及抗震加固后结构动力特性的变化是十分重要的。基于振动试验的土-结构相互作用体系自振周期和振型的变化，可以识别结构各部分的损伤和加固效果。在本项目中，首先，损伤和加固效果进行了调查的基础上强迫振动测试在一个既有建筑物加固工程前后。其次，开发了基于子结构法的土-结构相互作用振动台试验技术，并对模型结构进行了系统识别，到2001年度为止，在东北大学的实际9层钢筋混凝土建筑物上进行了使用冲击机和不平衡质量型激振器的振动试验。加固前进行了振动测试 ...更多信息工作和工作后。在前期测试的基础上，首先探讨了结构模型的振动特性与结构建成后的振动特性的对比，从而对结构的损伤识别技术进行了探讨。检测结构元件的每个部分的刚度折减系数。利用加固后的试验结果对加固效果进行了分析。与试验前的损伤检测相同的技术用于识别结构元件各部分的刚度增加。在2002财政年度，使用可控电磁型振动台开发了基于子结构方法的振动台试验技术。该试验方法使在假定的任意土壤条件下进行结构振动试验成为可能。首先，进行了数值模拟的测试和验证测试技术的有效性，通过系统识别的使用土壤弹簧的加速度观测记录。利用该试验装置进行了不同土-结构体系的模型试验，并通过对相互作用体系的系统辨识，验证了试验技术的有效性。试验模型的损伤/加固效果可以根据开发的测试方法进行评估。少