摘要
传统屈曲约束支撑(BRB)在多遇地震作用下通常处于弹性状态,不能耗散能量。为解决这一问题,将一字型屈曲约束支撑核心板开孔与铅芯组合,提出了一种钢铅复合分级耗能屈曲约束支撑(SLBRB)。首先介绍了SLBRB的构造与工作原理;其次采用ABAQUS有限元软件对SLBRB建模进行有限元分析;最后研究了铅芯面积、铅芯布置形式和铅芯直径与核心板开孔宽度的比值(径宽比)三个关键参数对SLBRB力学性能的影响,并给出了SLBRB各关键参数的建议值。结果表明:SLBRB的构造设计合理,铅芯与核心板能够协同工作;滞回曲线饱满,分级耗能能力良好;建议铅芯面积取值应保证Fd/Fc小于0.229;宜采用单根铅芯布置形式;径宽比取值应小于等于1。
Traditional buckling-restrained braces(BRBs)typically remain in an elastic state under frequent earthquakes and cannot dissipate energy.To address this issue,a steel-lead composite bucklingrestrained brace with multi-level energy dissipation(SLBRB)was proposed by introducing holes in the core plate of an I-shaped BRB and combining them with lead cores.First,the structure and working principle of the SLBRB were introduced.Then,finite element analysis was conducted on the SLBRB using the ABAQUS software.Finally,the influence of three key parameters—lead core area,lead core arrangement,and the ratio of lead core diameter to core plate hole width(diameter-to-width ratio)—on the mechanical properties of the SLBRB was investigated,and recommended values for these parameters were provided.The results showed that the structural design of the SLBRB was rational,and the lead core and core plate could work synergistically.The hysteresis curves were full,indicating good multi-level energy dissipation capacity.It was recommended that the lead core area should ensure that the Fd/Fc was below 0.229.Additionally,a single lead core arrangement was preferred,and the diameter-to-width ratio should be less than or equal to 1.
作者
贺拥军
刘学文
周绪红
HE Yongjun;LIU Xuewen;ZHOU Xuhong(School of Civil Engineering,Hunan University,Changsha 410082,China;School of Civil Engineering,Chongqing University,Chongqing 400044,China)
出处
《防灾减灾工程学报》
北大核心
2025年第4期879-887,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51890902、52478170)资助。
关键词
屈曲约束支撑
分级耗能
滞回特性
铅阻尼器
buckling-restrained brace
multi-level energy dissipation
hysteresis characteristics
lead damper
