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International Journal of Steel Structures

Published in:

13-10-2020

Stability of Large-Size and High-Strength Steel Angle Sections Affected by Support Constraint

Authors: Yun Sun, Yaojie Guo, Haoyuan Chen, Ke Cao

Published in: International Journal of Steel Structures | Issue 1/2021

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Abstract

The influence of support stiffness on the effective calculated length which plays an essential role in the axial compression stability of steel memeber is always ignored due to the ideal support constraint that is difficult to achieve in the test. In this paper, the calculation method of the effective length factor was put forward by the mechanical model of the axially compressed member. The supports rotation stiffness of large-size and high-strength steel angle sections (LHS) under the test condition were measured, and the effective length of each specimen was modified. And 36 LHS members were tested under axial load. Then the stability responses for LHS members were studied using finite element analysis considering more section profiles and the wide range slenderness ratios. Moreover, the buckling strengths were compared with the current design codes. The results show that the support constraint has a significant influence on the bearing capacity of the LHS member. Considering the influence of support restraint, when the slenderness ratio is small, the stability factor is higher than the column curve in current codes; when the slenderness ratio is large, b-curves in both GB50017-2017 and Eurocode 3 are conservative, whereas other codes are marginally unsafe. Finally, a new column curve was proposed to predict LHS members’ capacity more accurately.

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Title: Stability of Large-Size and High-Strength Steel Angle Sections Affected by Support Constraint
Authors: Yun Sun
Yaojie Guo
Haoyuan Chen
Ke Cao
Publication date: 13-10-2020
Publisher: Korean Society of Steel Construction
Published in: International Journal of Steel Structures / Issue 1/2021
Print ISSN: 1598-2351
Electronic ISSN: 2093-6311
DOI: https://doi.org/10.1007/s13296-020-00419-0

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