|Table of Contents|

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

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

Issue:
2025年04期
Page:
64-75
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on axial compression properties of cold-formed thin-walled steel I-shaped column with hybrid connection
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)
Keywords:
cold-formed thin-walled steel;  hybrid connection;  double-limb open-section column;  experimental study;  modified direct strength method
PACS:
TU392
DOI:
10.19815/j.jace.2023.10004
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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Last Update: 2025-07-10