|Table of Contents|

Study on axial compression behaviour of cold-formed thin-walled steel six-limbs built-up section columns(PDF)

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

Issue:
2026年02期
Page:
42-50
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on axial compression behaviour of cold-formed thin-walled steel six-limbs built-up section columns
Author(s):
ZHAO Yang1; 2;  NIE Shaofeng1;  ZHOU Tianhua1;  LIU Xiangbin2;  SANG Liurui3;  WANG Xudong1
(1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Infrastructure Department, Chang'an University, Xi'an 710064, Shaanxi, China; 3. School of Sciences, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
cold-formed thin-walled steel;  six-limbs built-up column;  experimental study;  axial compression behaviour
PACS:
TU392.5
DOI:
10.19815/j.jace.2025.10005
Abstract:
In order to investigate the axial compression behaviour of cold-formed thin-walled steel six-limbs built-up section columns, 12 such columns were subjected to axial compression tests. The load-axial displacement curves, load-mid-column deflection curves, load-strain curves, and ultimate bearing capacities of the specimens were obtained. The buckling modes and failure modes of the specimens were analyzed. Using the finite element analysis software ANSYS, a refined finite element model of the six-limbs built-up column was established, and systematic research was conducted to explore the influence of parameters such as slenderness ratio and web height-to-thickness ratio on the mechanical performance of the built-up column. The results show that the buckling mode of short axial compression columns is primarily local-distortional related buckling, while the main failure mode of long axial compression columns is local-distortional-global related buckling. The ultimate bearing capacity and stiffness of the built-up columns decrease as the slenderness ratio and web height-to-thickness ratio increase. When the slenderness ratio increases from 18.0 to 216.7(90 series)and from 12.4 to 221.1(140 series), the ultimate bearing capacity decrease by 81.76% and 82.71%, respectively. When the web height-to-thickness ratio increases from 46.0 to 115.0(90 series)and from 71.5 to 178.8(140 series), the bearing capacity reduction of specimens with different lengths reaches 63.0%-88.0%.

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Last Update: 2026-04-01