摘要
为了研究采用A5083铝合金作为芯材的屈曲约束支撑的滞回性能和疲劳性能,提出了一种双铝合金内芯装配式屈曲约束支撑,以芯板开孔、芯板与约束板的间隙作为变化参数,设计了3个试件,对其进行拟静力试验研究。结果表明:双铝合金内芯装配式屈曲约束支撑的滞回曲线饱满对称,耗能能力、塑性变形能力及疲劳性能良好,表现出明显的应变强化和循环硬化特性;芯板开孔起到了保护芯板端部、使支撑充分耗能的作用;芯板与约束板间1~2 mm的间隙,设置合理;开孔芯板的多波屈曲分布均匀,主要出现在开孔区域内,芯板开孔避免了芯板端部的应力集中,使支撑的受力更均衡。采用经验证的有限元分析方法对支撑进行分析,结果表明:芯板从开孔段到未开孔段依次屈服,最终实现全耗能段的屈服;采用A5083铝合金与LY160低屈服点钢材作为芯材的支撑有良好且相近的耗能能力,但A5083铝合金可以有效降低支撑的质量,节约成本。
In order to study the hysteretic and fatigue performance of the BRB with A5083 core plate,double A5083 core plate-assembled BRB(DAPBRB)was proposed.Three specimens were designed for the pseudo-static test with the opening of the core plate and the gap between the core plate and the restrained plate as the test variables.The hysteresis curves are full and symmetrical,the energy dissipation capacity,plastic deformation capacity and fatigue performance are excellent,and the DAPBRB exhibit obvious strain hardening and cyclic hardening characteristics.The core plate opening can protect the end of the core plate and the DAPBRB can consume enough energy;a 1 mm to 2 mm gap between the core plate and the restrained plate is reasonable.The multi-wave buckling of the core plate is evenly distributed and mainly occurs in the open area.The open core plate avoids the stress concentration at the end of the plate and makes the force more balanced.The proven FEM was used to analyze the DAPBRB.The FE results show that the core plate yields successively from the open to the unopened section and finally reaches the full energy dissipation section;it is also shown that the DAPBRB using LY160 and A5083 as the core material has good and similar energy consumption capacity,but A5083 can effectively reduce the BRB weight and save cost.
作者
李帼昌
闫鹤丹
邱增美
LI Guochang;YAN Hedan;QIU Zengmei(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第5期209-220,共12页
Journal of Building Structures
基金
国家自然科学基金重点项目(51938009)。
关键词
屈曲约束支撑
装配式
铝合金
拟静力试验
有限元分析
滞回性能
buckling-restrained brace
assembly type
aluminum alloy
quasi-static test
finite element analysis
hysteretic performance
