Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Determination of the bearing capacity of the flange and web of box sections under concentrated loads

Document Type : Original Article

Authors
Nima Fakhar Hasani 1
Yousef Hosseinzadeh 2
1 Student in Structural Engineering. Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
2 Professor, Structural Eng. Dept., Faculty of Civil Engineering, , University of Tabriz, Tabriz, Iran.
10.22065/jsce.2025.487940.3567
Abstract
In the design of steel beam-to-column moment connections, controlling the local effects of concentrated loads on the column flange is essential. The available capacity of flange and web in local bending, web local yielding, web compression buckling, and web local crippling under concentrated loads are developed based on research on the behavior of wide flange sections, and limited information is available on the behavior of box sections. In this paper, the bearing capacity of the flange and web of box sections under concentrated loads is evaluated. A finite element model was created to investigate the behavior of the flange and web of a box column under a concentrated load, and its accuracy was evaluated using experimental data. Subsequently, the behavior of eight box column specimens under three types of loading defined in the AISC 360-22 specification, namely, single compression, double compression, and single tension, was investigated. The capacity of the flange and web of box sections in local failure was determined using code equations and compared with the results of finite element analysis. The results revealed that the theoretical local web yielding capacity is between 66% and 153% of the column capacity. On the other hand, the web local crippling capacity determined using AISC 360-22 specification is non-conservative and ranged from 406% to 932% of the actual capacity. Additionally, the design code relationship for web compression buckling is also non-conservative, providing a value between 1246% and 3810% of the actual column capacity. The code equation for local flange bending was always conservative, providing values between 38% and 89% of the column capacity. Two relationships are proposed for determining the web local crippling and web compression buckling capacities of box columns.
Keywords
Box Column
Local Failure
Web Local Yielding
Web Local Crippling
Web Compression Buckling
Flange Local Bending
Finite Element Model

Subjects

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Journal of Structural and Construction Engineering
Volume 12, Issue 09 - Serial Number 98
December 2025
Pages 82-104

  • Receive Date 16 November 2024
  • Revise Date 08 January 2025
  • Accept Date 06 February 2025