屈曲约束支撑力学性能试验加载制度研究  

Loading protocols for mechanical property qualification test of buckling-restrained braces

作　　者：周颖[1] 黄智谦 MARIO Aguaguiña 周云[2] 陈鹏[1] ZHOU Ying;HUANG Zhiqian;MARIO Aguaguiña;ZHOU Yun;CHEN Peng(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]广州大学土木工程学院,广东广州510006

出　　处：《建筑结构学报》2021年第11期182-194,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52025083,51878502);上海市优秀学术带头人项目(19XD1423900)。

摘　　要：目前,由国内的加载制度检测得到的屈曲约束支撑性能相对较小,这导致大部分满足其他国家性能要求的构件无法应用于我国工程实践中。为了推动国产屈曲约束支撑的国际工程应用,以中国规范和日本规范规定的屈曲约束支撑力学性能检验方法为基础,分析规范中对最大变形幅值、变形范围和循环次数的要求;通过OpenSees建模分析,对不同加载历程下屈曲约束支撑的拟静力反复加载试验进行模拟,采用累积非弹性变形和累积滞回耗能来评估屈曲约束支撑的性能,将滞回能量的累积分布作为评估加载制度的幅值增长规律的参数;基于中日规范中屈曲约束支撑循环试验加载制度的定义以及在两种不同加载方式下屈曲约束支撑循环试验数值模拟的结果,提出用于屈曲约束支撑性能检验试验的新加载制度(GLP)。研究结果表明,GLP具有较大的累积非弹性变形,与所参照的累积滞回耗能分布吻合较好;其最大变形幅值为3.0%,与日本规范要求的最大钢芯应变水平相一致。At present, the test performance of buckling-restrained braces by domestic loading system is relatively low, as a result, most of the specimens that meet the performance requirements of other countries are unable to be used in Chinese engineering practice. In order to promote the application of domestic buckling-restrained brace(BRB) in international engineering, the loading protocols for qualification testing of BRB prescribed in the codes of China and Japan were consulted. The maximum deformation amplitude, deformation range and number of cycles were considered as the main properties. The OpenSees platform was used to carry out the modeling and analyses to perform a series of simulations of quasi-static cyclic tests of BRB under two different loading histories. The demands imposed to BRB were evaluated in terms of cumulative inelastic deformation and cumulative energy dissipation. In addition, the cumulative distribution of the hysteretic energy was defined as a parameter for the assessment of the amplitude-growth rule of the loading protocols. Based on the definition of the buckling restraint cyclic test loading system in the Chinese and Japanese codes and the results of the buckling restraint cyclic test under two different loading methods, a new loading system GLP for the buckling-restrainted braces performance inspection test was proposed. The results demonstrate that the proposed loading history imposes larger cumulative inelastic deformation and shows a good agreement with the reference cumulative distribution of the hysteretic energy. Its maximum deformation amplitude is 3.0%, which is consistent with the maximum steel core strain level required by Japanese codes.

关 键 词：屈曲约束支撑 加载制度 拟静力试验 累积非弹性变形 累积滞回耗能 

分 类 号：TU352.1[建筑科学—结构工程] TU317