屈曲约束支撑的最小工作段长度研究  

Research on the Minimum Working Segment Length of Buckling Restrained Braces

作　　者：尹文汉[1] 李春祥[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《建筑钢结构进展》2014年第3期30-36,共7页Progress in Steel Building Structures

摘　　要：提出了屈曲约束支撑(BRB)最小工作段长度的确定方法。首先,阐述了BRB工作段长度问题对其疲劳性能和屈服时机的研究意义,并指出现有讨论对此认识的不足。而后,指出了BRB工作段最小长度主要受其疲劳性能的影响,而其疲劳性能的影响因素可以概括为材料、构造、加载历史。接着,比较了两种BRB疲劳性能的评估方法——Miner准则和预测累计塑性变形能力的骨架法。由于后者较优,因此,基于后者提出BRB最小工作段长度确定方法。最后,通过MATLAB平台编程,并结合相关文献中的数据,进行了数值研究,综合得出一些有价值的结论。This paper proposes an approach for calculating the minimum working segment length of buckling restrained braces （BRB）. Firstly, the minimum working segment length, which is also called core length, has a crucial influence on both the yield moment and fatigue performance of the BRB. However, there are a few shortcomings on current understanding of the minimum working segment length. Secondly, the minimum working segment length of BRB is mainly affected by low cycle fatigue properties which depend on material, configuration details, and load history of BRB. Then two fatigue evaluation methods, Miner method and skeleton method through the prediction of cumulative plastic deformation ability,are compared with each other,and the latter is applied to determine the minimum length of BRBs due to better prediction. At last,using MATI.AB platform and data from previous studies,the numerical study is carried out and some valuable conclusions are obtained, which provides reference for determining the minimum working segment length of the BRB.

关 键 词：屈曲约束支撑 最小工作段长度 低周疲劳 累计塑性变形能力 

分 类 号：TU352.1[建筑科学—结构工程]