|Table of Contents|

Numerical investigation of fire resistance of concrete-filled steel tubular column-composite beam joints after cyclic loading(PDF)

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

Issue:
2025年01期
Page:
1-13
Research Field:
建筑结构
Publishing date:

Info

Title:
Numerical investigation of fire resistance of concrete-filled steel tubular column-composite beam joints after cyclic loading
Author(s):
WANG Wenda1; 2;  LI Shengqiang1;  MAO Wenjing1; 2;  ZHENG Long1
(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China)
Keywords:
concrete-filled steel tubular column-composite beam joint;  low cyclic loading;  damage degree;  fire resistance limit
PACS:
TU391
DOI:
10.19815/j.jace.2023.01081
Abstract:
To study the fire resistance of concrete-filled steel tubular(CFST)column-composite beam joint after cyclic loading, the finite element model of the joint was developed using ABAQUS software and verified with existing experimental results. On this basis, the influence of plastic damage and residual deformation on the stress and deformation of composite beam joints under fire after cyclic loading was analyzed, and the influence of different damage degree, load level and fire protection layer thickness on the fire resistance limit and failure mode of joints was analyzed. The results show that the seismic pre-damage has an adverse effect on the fire resistance of the joints. The fire resistance has a significant decrease with the increase of the pre-damage degree. The fire resistance limit of the joint with severe damage is reduced by 23.5% compared with the joint without damage. The joints with severe damage form plastic hinges under fire and produce large energy dissipation damage. No obvious plastic hinges are formed under mild and moderate damage, and the fire resistance limit is only reduced by 1.0% and 3.6%, respectively. For joints considering beam damage as the primary pre-damage mode, the beam load ratio and the fire protection layer thickness are the key factors that affect the fire resistance of joints. With the increase of the column load ratio, the fire resistance limit decreases, but the overall effect is not significant.

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Last Update: 2025-01-20