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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年04期

页码:

64-75

栏目:

建筑结构

出版日期:

2025-07-10

文章信息/Info

Title:

Experimental study on axial compression properties of cold-formed thin-walled steel I-shaped column with hybrid connection

文章编号:

1673-2049(2025)04-0064-12

作者:

褚云朋,江天勇,陈雪琴,伏金蓉,夏珲

(西南科技大学 土木工程与建筑学院,四川 绵阳 621010)

Author(s):

CHU Yunpeng, JIANG Tianyong, CHEN Xueqin, FU Jinrong, XIA Hui

(School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China)

关键词:

冷弯薄壁型钢;  混合连接;  双肢开口拼合柱;  试验研究;  修正直接强度法

Keywords:

cold-formed thin-walled steel;  hybrid connection;  double-limb open-section column;  experimental study;  modified direct strength method

分类号:

TU392

DOI:

10.19815/j.jace.2023.10004

文献标志码:

A

摘要:

为分析连接方式对冷弯薄壁型钢双肢开口拼合工字形柱轴压力学性能的影响,对24根自攻螺钉与拉铆钉混合连接方式下的双肢开口拼合工字形柱开展试验研究,得到了试件的极限承载力、破坏模式、荷载-应变曲线及荷载-轴向位移曲线等,并将试验结果与纯自攻螺钉连接的双肢开口拼合工字形柱进行对比。结果表明:与纯自攻螺钉连接方式相比,两种混合连接方式的双肢开口拼合工字形短柱极限承载力分别提高了8.5%和8.6%,而中柱分别提高了18.1%和15.9%; 连接方式对拼合短柱与中柱的屈曲荷载影响较大,对短柱的极限承载力影响较大,对中柱的极限承载力影响则较小; 采用混合连接方式的拼合柱极限承载力普遍高于纯自攻螺钉连接的拼合柱,随连接件纵距增加,混合连接方式下的拼合柱极限承载力均逐步降低,但始终高于纯自攻螺钉连接的拼合柱,说明混合连接能有效提升拼合柱的稳定性; 根据试验结果对北美规范的直接强度法进行修正,为采用混合连接的双肢开口拼合柱的极限承载力计算提供参考。

Abstract:

In order to analyze the influence of connection mode on the axial compressive mechanical properties of cold-formed thin-walled steel double-limb open-ended assembled I-shaped columns, the experimental study on 24 double-limb open-ended assembled I-shaped columns under the mixed connection mode of self-tapping screws and rivets was carried out. The ultimate bearing capacity, failure mode, load-strain curve and load-axial displacement curve of the specimens were obtained, and the experimental results were compared with those of the double-limb open-ended assembled I-shaped columns connected by pure self-tapping screws. The results show that compared with the pure self-tapping screw connection method, the ultimate bearing capacity of the double-limb open-ended assembled I-shaped short columns of the two hybrid connection methods is increased by 8.5% and 8.6%, respectively, while the middle column is increased by 18.1% and 15.9%, respectively. The connection mode has a great influence on the buckling load of the short column and the middle column, and has a great influence on the ultimate bearing capacity of the short column, but has little influence on the ultimate bearing capacity of the middle column. The ultimate bearing capacity of the combined column with mixed connection is generally higher than that of the combined column with pure self-tapping screw connection. With the increase of the longitudinal distance of the connector, the ultimate bearing capacity of the combined column with mixed connection is gradually reduced, but it is always higher than that of the combined column with pure self-tapping screw connection, indicating that the mixed connection can effectively improve the stability of the combined column. According to the test results, the direct strength method of the North American code is modified to provide a reference for the calculation of the ultimate bearing capacity of the double-limb split column with hybrid connection.

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相似文献/References:

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　GAO Ting-ting,ZHOU Xu-hong,LIU Yong-jian,et al.Applicability Analysis of Bear Capacity of Flexural Members with Thickness Less than 2 mm Calculated Using GB 50018—2002[J].Journal of Architecture and Civil Engineering,2013,30(04):91.
[2]石 宇,王身伟,刘永健.冷弯薄壁型钢单颗自攻螺钉抗剪连接性能研究[J].建筑科学与工程学报,2014,31(02):57.
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备注/Memo

备注/Memo:

收稿日期:2023-10-25
基金项目:国家自然科学基金项目(52268029); 四川省自然科学基金项目(2023NSFSC0381)
作者简介:褚云朋(1979-),男,工学博士,教授,E-mail:chuyunpeng@swust.edu.cn。
Author resume: CHU Yunpeng(1979-), male, PhD, professor, E-mail: chuyunpeng@swust.edu.cn.

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更新日期/Last Update: 2025-07-10