[1]唐贞云 郭珺 李振宝.非线性实时动力子结构试验系统稳定性分析[J].西安建筑科技大学学报(自然科学版),2017,49(02):228-234.[doi:10.15986/j.1003-7930.2017.02.011]
　TANG Zhen yun,GUO Jun,LI Zhen bao.The stability analysis of nonlinear real-time dynamic substructuring system[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2017,49(02):228-234.[doi:10.15986/j.1003-7930.2017.02.011]
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非线性实时动力子结构试验系统稳定性分析()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
49
期数:
2017年02期
页码:
228-234
栏目:
出版日期:
2017-04-28

文章信息/Info

Title:
The stability analysis of nonlinear real-time dynamic substructuring system
文章编号:
1006-7930(2017)02-0228-07
作者:
唐贞云 郭珺 李振宝
(北京工业大学 城市与工程安全减灾教育部重点实验室,北京100124)
Author(s):
TANG Zhen yun;  GUO Jun;  LI Zhen bao
(The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology , Beijing 100124, China)
关键词:
实时子结构; 稳定性; 非线性振动台; 作动器
Keywords:
real-time dynamic substructuring;  stability;  nonlinearity;  shaking table;  actuator
分类号:
TU317
DOI:
10.15986/j.1003-7930.2017.02.011
文献标志码:
A
摘要:
实时动力子结构试验系统由物理子结构和数值子结构组成，两者实时传输数据，真实再现地震响应。稳定性分析是试验是否可以正常进行的基础对于试验运行至关重要。子结构试验的宗旨在于基于现有设备能进行大尺寸构件的非线性特性试验，而既有研究对子结构试验系统稳定性问题的探讨主要集中于线性阶段，对于结构进入非线性后的影响涉及较少，因此，结构非线性行为对稳定性造成怎样的影响是本文研究的重点。本文基于“增益裕度”提出了可以同时考虑加载系统、试验试件动力特性及其耦合效应的稳定性分析方法。以线性系统为基础分别探究了基于振动台和作动器的实时子结构试验全过程的稳定性界限。分析结果表明，基于作动器的子结构试验系统稳定性，对于初始频率较低的结构，可以通过初始稳定性判定；对于初始频率较高的结构，需要考虑非线性的影响。在基于振动台的子结构试验系统中，物理与数值子结构频率比是影响子结构试验系统稳定性的主要因素，该比值越小非线性对稳定性的影响越小，该比值较大时非线性会降低试验系统稳定性。
Abstract:
Real-time dynamic substructure (RTDS) system consists of the numerical substructure and the experimental substructure. The two parts transmit data at the same time so that it can simulate real seismic responses. The stability of RTDS is the basic of the experiment’s feasibility and it plays a key role in the implementation of a test. The purpose of substructure testing is to experiment large size specimens which are nonlinear based on the existing equipment. However, existing researches about the stability of RTDS system almost concentrate on the linear stage and less talk about the effects when structures get into the nonlinear part. Therefore, this paper focuses on the effect of stability of nonlinear structures. A novel analysis method of stability was developed by using the concept of ‘gain margin‘. It can consider the loading system and specimens’ dynamic characteristics and coupling effects at one time. The whole process of stability analysis in RTDS testing was based on linear system. It discussed the results base on the loading system of shaking table and the actuator respectively. The analysis results show that the stability based on the loading system of actuator can be determined by the initial stability when it has lower initial frequency. Besides, when the initial frequency is higher the nonlinear influence should take into account. The frequency ratio of physical and numerical substructure is the main factor affecting the stability of RTDS system which based on the loading system of shaking table. When the ratio is small the influence of the nonlinear of the stability is small. And when the ratio is large, the nonlinear will reduce the stability of the test system.

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备注/Memo

备注/Memo:

收稿日期： 2016-06-25 修改稿日期：2017-03-21

基金项目基金项目：北京市自然科学基金资助项目（8164050）, 2014年度北京市优秀人才培养基金资助青年骨干个人项目(2014000020124G035)

作者简介：唐贞云(1983―)，男，讲师，博士，主要从事结构抗震实验技术研究．E-mail：tzy@bjut.edu.cn
更新日期/Last Update: 2017-06-09