Effect of vertical stiffeners on the seismic performance of T‐shaped CFST column to steel beam joint

The Structural Design of Tall and Special Buildings Pub Date : 2024-05-15 DOI:10.1002/tal.2131

Binyang Li, Yuanlong Yang, Jiepeng Liu, Yu Cheng, Y. Chen

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Abstract

Special‐shaped concrete‐filled steel tubular (SCFST) columns have recently been developed for efficient steel‐concrete composite construction. In this study, a novel vertical stiffener joint for the SCFST column and steel beam frame structure is proposed. Five SCFST columns with H‐section beam joints were investigated under cycling loading. The test parameters mainly consider the column stiffening form, vertical stiffener type, and the column axial load. The failure pattern, hysteretic curves, and strain development of specimens are analyzed. Experimental results demonstrate the proposed joint with vertical stiffeners can develop the steel beam's full plastic flexural capacity and exhibit favorable seismic performance. In addition, a finite element (FE) model is developed to explore the effects of the following parameters on the hysteretic performance: vertical stiffener sizes, width‐to‐thickness ratio of column steel tube, and the column axial load. Based on the experimental and FE analyses, a stress and deformation model of the joint steel tube was established. To facilitate the practical applications, a calculation formula for joint strength was also put forward, considering the contribution of vertical stiffener, and front and side steel plates of the joint steel tube.

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垂直加劲件对 T 型 CFST 柱与钢梁连接处抗震性能的影响

最近开发出了用于高效钢-混凝土复合结构的异形混凝土填充钢管（SCFST）柱。本研究为 SCFST 柱和钢梁框架结构提出了一种新型垂直加劲连接。在循环荷载作用下，对五根带有 H 型截面梁连接件的 SCFST 柱进行了研究。试验参数主要考虑了柱加劲形式、竖向加劲件类型和柱轴向荷载。分析了试件的破坏模式、滞后曲线和应变发展。实验结果表明，所提出的带竖向加劲件的连接能充分发挥钢梁的塑性抗弯能力，并表现出良好的抗震性能。此外，还建立了一个有限元（FE）模型，以探讨以下参数对滞后性能的影响：垂直加劲件尺寸、柱钢管的宽厚比和柱轴向荷载。在实验和 FE 分析的基础上，建立了连接钢管的应力和变形模型。为便于实际应用，考虑到竖向加劲件、连接钢管前钢板和侧钢板的作用，还提出了连接强度的计算公式。

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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The Structural Design of Tall and Special Buildings

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