为增强钢结构仿古建筑的震后快速修复能力，提出了一种适用于仿古建筑形制特点的形状记忆合金（shape memory alloy，SMA）杆-摩擦阻尼器串联装置，通过对附加和不附加该串联装置的钢结构仿古建筑梁柱节点试件进行低周反复加载试验，对比分析了两种节点的破坏特征、荷载-位移曲线、刚度、滞回耗能与复位能力等。结果表明：在位移角不超过1.8%时，仅SMA杆被拉伸，随着加载位移继续增大，摩擦阻尼器和SMA杆共同作用。附加SMA杆-摩擦阻尼器串联装置可有效提升钢结构仿古建筑梁柱节点的抗震性能，极限承载力和累计耗能量相应提高了151%、86%，残余位移减小了27%，试件的损伤和变形主要发生在梁柱节点角钢处。建立了带SMA杆-摩擦阻尼器串联装置的钢结构仿古建筑梁柱节点的有限元模型并进行了参数分析，结果表明：节点的极限承载力随着摩擦阻尼器起滑力的增大而增加，随着轴压比的增大而降低，而SMA杆预紧力的影响较小可以忽略。
Abstract
To improve the rapid post-earthquake reparability of steel structure antique buildings, this paper proposes a shape memory alloy (SMA) bar-friction damper series device suitable for the characteristics of antique buildings. The cyclic loading tests were conducted on beam-column joints in steel structure antique buildings with and without the proposed device. Properties such as damage characteristics, load-displacement curves, stiffness, hysteretic energy dissipation and recovering capacity of these two types of joints were analyzed. The results showed that only the SMA bars are stretched when the loading displacement angle does not exceed 1.8%, the friction damper and the SMA bars work simultaneously with the increasing of the loading displacement. Installing the SMA bar-friction damper series device around beam-column joints can effectively improve the seismic performance of the steel antique building, the ultimate strength and the cumulative energy dissipation is increased by 151% and 86%, the residual displacement is decreased by 27%, the damage and deformation of the specimen mainly occurs at the steel angles. The finite element models of beam-column joints with SMA bar-friction damper series device in steel antique buildings was established and its parameters are analyzed. The results showed that the bearing capacity of the proposed joint is increasing with the increase of sliding force in friction dampers, and it decreases with the increase of column axial compression ratio, while the effect of the SMA bar preload is negligible.
关键词
钢结构仿古建筑 /
梁柱节点 /
摩擦阻尼器 /
形状记忆合金杆 /
抗震性能
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Key words
steel antique building /
beam-column joints /
friction damper /
shape memory alloy bar /
seismic performance
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