Cyclic behavior of beam-to-upright bolted connections: Experimental study of Chilean steel storage racks

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2024-11-13 DOI:10.1016/j.engstruct.2024.119310

Eduardo Nuñez , Ramón Mata , Marcelo Sanhueza , Matías Hernández , Nelson Maureira , Néstor Guerrero

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Abstract

In this research an experimental study to assess the cyclic behavior of bolted moment connection in racks structures is performed. The effect of bolt pretension in the response is evaluated. Sixteen full-scale steel rack joint configurations were subjected to cyclic load according to the protocol established in AISC Seismic provisions. The cyclic performance was evaluated in terms of hysteretic response, failure mechanism, energy dissipation, stiffness, and rotation on the components. Two different configurations were studied. The results showed that the steel rack connections using a 70 % of bolt pretension can accommodate a 0.8 My at 0.04 rad of drift angle, while the joints without bolt pretension reached values below 0.7 My at 4 % of rotation. The failure mechanism was controlled by weld fracture at 4 % of the rotation. A high dispersion in the energy dissipation pattern was obtained and a drop in energy dissipation of up to 4 times in all specimens tested for a 4 % rotation was developed. This phenomenon is due to the welding rupture between the beam and the L-connector. A degradation of the secant stiffness reached up to 60 % for 2 % rotation. Finally, the most important effect of bolt pretension on the cyclic response of steel rack connections was achieved in the increase of flexural resistance and rotation developed.

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梁对直角螺栓连接的循环行为：智利钢制仓储架的实验研究

本研究对机架结构中螺栓力矩连接的循环行为进行了评估。评估了螺栓预拉力对响应的影响。根据 AISC 抗震规定中制定的协议，对 16 种全尺寸钢制货架连接配置进行了循环载荷试验。从滞后响应、失效机制、能量耗散、刚度和部件旋转等方面对循环性能进行了评估。研究了两种不同的配置。结果表明，使用 70% 的螺栓预紧力的钢架连接件可在 0.04 弧度的漂移角下承受 0.8 My 的冲击力，而未使用螺栓预紧力的连接件在 4% 的旋转角下的冲击力值低于 0.7 My。失效机理由旋转 4% 时的焊缝断裂控制。能量耗散模式的分散性很高，在旋转 4 % 的情况下，所有测试的试样的能量耗散都下降了 4 倍。这种现象是由于横梁和 L 型连接器之间的焊接断裂造成的。在旋转 2% 时，正弦刚度下降达 60%。最后，螺栓预拉力对钢齿条连接循环响应的最重要影响体现在抗弯和旋转的增加上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.