Seismic performance of cold-formed steel bolted moment connections with bolting friction-slip mechanism
Seismic performance of cold-formed steel bolted moment connections with bolting friction-slip mechanism
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DOI：
10.1016/j.jcsr.2019.01.013
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发表时间：
2019-05-01
影响因子：
4.1
通讯作者：
Hajirasouliha, Iman
中科院分区：
文献类型：
--
作者：
Ye, Jun;Mojtabaei, Seyed Mohammad;Hajirasouliha, Iman
由于薄壁 CFS 元件的局部/扭曲屈曲阻力较低，典型的冷弯型钢 (CFS) 抗弯连接通常具有相对较低的延展性和能量耗散能力，因此可能不适合地震应用。针对这一问题，对具有虚构滑移机制的CFS螺栓梁柱连接的抗震性能进行了全面的分析研究，旨在获得更有效的适合地震区CFS框架的设计方案。 ABAQUS 中经过实验验证的有限元 (FE) 模型用于通过考虑螺栓系统的特性以及非线性材料属性和几何缺陷来预测一系列 CFS 连接的滞后行为和失效。然后使用开发的模型来研究 CFS 梁横截面形状和分类、螺栓配置和抗滑性能对连接抗震性能的影响。结果表明，使用螺栓摩擦滑移机制可以显着提高（高达 200%）连接的延性、耗能能力和阻尼系数，特别是对于具有较薄板（3 级和 4 级）的 CFS 梁。根据结果，确定了最佳设计配置，以改善强震下 CFS 连接的循环响应。虽然具有 3 级和 4 级梁截面的传统螺栓力矩连接通常不能满足 AISC 对中间和特殊力矩框架的要求，但研究表明，采用螺栓摩擦滑移机制的优化设计连接可以在高地震区有效使用。 (C) 2019 Elsevier Ltd. 保留所有权利。
Typical cold-formed steel (CFS) moment-resisting connections generally have relatively low ductility and energy dissipation capacity as a result of low local/distortional buckling resistance of thin-walled CFS elements, and therefore, may not be suitable for seismic applications. To address this issue, a comprehensive analytical study is presented on the seismic performance of CFS bolted beam-to-column connections with fiction-slip mechanism aiming to obtain more efficient design solutions suitable for CFS frames in seismic regions. Experimentally validated finite element (FE) models in ABAQUS are used to predict the hysteretic behaviour and failure of a range of CFS connections by taking into account the characteristics of the bolting system as well as nonlinear material properties and geometrical imperfections. The developed models are then used to investigate the effects of CFS beam cross-sectional shape and classification, bolt configuration, and slip resistance on the seismic performance of the connections. It is shown that using bolting friction-slip mechanism can significantly increase (up to 200%) the ductility, energy dissipation capacity and damping coefficient of the connections especially for CFS beams with thinner plates (class 3 and 4). Based on the results, the best design configurations are identified to improve the cyclic response of the CFS connections under strong earthquakes. While conventional bolted moment connections with class 3 and 4 beam cross-sections generally do not satisfy the AISC requirements for intermediate and special moment frames, it is shown that optimum designed connections with bolting friction-slip mechanism can be efficiently used in high seismic regions. (C) 2019 Elsevier Ltd. All rights reserved.