摘要
基于形状记忆合金(SMA)的超弹性和扩孔型螺栓连接的低摩擦滑移性能,提出一种自复位SMA支撑,主要由四块钢板、两个滑移螺杆、SMA丝材、丁基橡胶垫片、固定钢垫片和滑移钢垫片组成。对四个考虑不同SMA面积和滑移螺杆预拉力的自复位SMA支撑进行低周往复荷载试验,研究其滞回性能和耗能能力。采用ANSYS软件建立有限元模型,并通过试验数据对其进行验证,结果吻合良好。对9个考虑不同SMA面积、摩擦系数、SMA长度和螺杆预拉力的模型进行分析。结果表明:增大SMA面积可提高支撑的承载力和耗能能力、减小残余变形,增大摩擦系数和滑移螺杆预拉力可提高支撑的承载力、耗能能力和残余变形,增大SMA长度对支撑性能无明显影响。对比有限元与简化力学模型计算结果表明,两者的抗滑移承载力、最大恢复力和残余变形最大误差仅为6.89%、7.01%和5.60%,验证了该简化力学模型的准确性。
A self-centering brace with low friction of slotted bolted connection and super-elastic shape memory alloy(SMA) is developed,which is composed of four steel plates,two slip bolts,SMA wires,low modulus shims,fixed steel shims and slip steel shims. Low frequency cyclic tests were carried on four self-centering SMA brace specimens with different SMA cross sections and slip bolt preloads. The hysteresis curves and energy dissipation capacity were investigated. Then nine numerical models were established by software ANSYS to investigate the influence of SMA area,friction coefficient,SMA length and slip bolt preload and it was verified against the experimental results.Numerical results show that increasing the SMA area can improve the bearing capacity and energy dissipation capacity and reduce the residual deformation of self-centering SMA brace. The bearing capacity,energy dissipation capacity and residual deformation are effectively improved with the increase of the friction coefficient and slip bolt preload. But the change of SMA length has a very limited effect on the mechanical performance of self-centering SMA brace.Finally,compared with the FE results,the slip loads,maximum loads and residual deformation calculated by the proposed simplified mechanical model have a maximum error of 6. 89%,7. 01% and 5. 60%,respectively,which verifies the accuracy of the simplified mechanical model.
作者
胡淑军
顾琦
姜俊
宋固全
熊进刚
HU Shujun;GU Qi;JIANG Jun;SONG Guquan;XIONG Jingang(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China;Jiangxi Provincial Engineering Laboratory of Nearly Zero Energy Building,Nanchang University,Nanchang 330031,China;Hongdu Construction Group Co.,Ltd.,Nanchang 330029,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S01期66-75,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51768044,51908268,51968047)
江西省博士后科研择优资助项目(2019KY57)
关键词
自复位支撑
形状记忆合金
摩擦系数
滞回性能
力学模型
残余变形
self-centering brace
shape memory alloy
friction coefficient
hysteresis performance
mechanical model
residual deformation
作者简介
胡淑军,出生于1985年,男,工学博士,讲师,主要从事结构消能减震技术、结构优化等研究。email:hushujun@ncu.edu.cn;通信作者:熊进刚,出生于1970年,男,工学博士,教授,主要从事结构抗连续性倒塌、结构优化等研究。email:xiongjingang@ncu.edu.cn
