Hysteresis performance and simplified mechanical model of an innovative self-centering SMA brace

被引：0

作者：

Hu S. ^{[1
,2
]}

Gu Q. ^{[1
]}

Jiang J. ^{[3
]}

Song G. ^{[1
]}

Xiong J. ^{[1
,2
]}

机构：

[1] School of Civil Engineering and Architecture, Nanchang University, Nanchang

[2] Jiangxi Provincial Engineering Laboratory of Nearly Zero Energy Building, Nanchang University, Nanchang

[3] Hongdu Construction Group Co., Ltd., Nanchang

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2020年 / 41卷

关键词：

Friction coefficient; Hysteresis performance; Mechanical model; Residual deformation; Self-centering brace; Shape memory alloy;

D O I：

10.14006/j.jzjgxb.2020.S1.008

中图分类号：

学科分类号：

摘要：

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. © 2020, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：66 / 75

页数：9

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