Influence of rotational restraints on response of H-section steel columns under fire

Binhui Jiang, Zhongyuan Yin, Michael C.H. Yam, Jingzhou Zhang, Liping Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

In this paper, a parametric investigation on the influence of rotational restraints on the response of H-section steel columns under fire was conducted through a validated numerical model. Nine rotational restraint stiffness ratios (βR) were considered, from 0.0001 to 10.0. Other considered parameters include the slenderness ratio, axial restraint stiffness ratio, and load ratio. The analysis results showed that there are three failure scenarios of the columns with βR increases from 0.0001 to 10.0. Specifically, in failure scenario I, the failures are all dynamic failures; in failure scenario II, the failures change from dynamic failure to quasi-static failure; and in failure scenario III, the failures are all quasi-static failures. The occurrence of the failure scenarios is related to the slenderness ratio, axial restraint stiffness ratio, and load ratio. The dynamic effects of the columns in failure scenario I decrease first and then increase with the increase of βR. The dynamic effects of the columns in failure scenario II decrease with the increase of βR until the failure type of the columns change to quasi-static failure. For the above failure scenarios, there is a critical value of βR (namely βR,cr), after reaching which the influence of βR on the response of the columns becomes negligible. The value of βR,cr is less than 2.0 in general, and depends on the slenderness ratio, axial restraint stiffness ratio, and load ratio. The failure scenarios and βR,cr values of the H-section columns are the same with box-section columns for most of the cases.

Original languageEnglish
Article number107104
JournalJournal of Constructional Steel Research
Volume190
DOIs
Publication statusPublished - Mar 2022

Keywords

  • Dynamic effect
  • Fire
  • H-section
  • Parametric analysis
  • Rotational restraint
  • Steel column

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys

Cite this