Indexed by:
Abstract:
This paper investigates the fire performance of geopolymeric recycle aggregate concrete-filled steel tubular (GRACFST) columns under compression-bending-shear multi-loading conditions. A series of fire resistance tests on 11 GRACFST columns were designed and conducted, and the investigated parameters encompassed load case, axial load ratio, horizontal load ratio, recycled aggregate replacement ratio, axial load eccentricity and section type. The test results show that the specimens predominantly failed due to overall bending. The axial load ratio significantly influenced the fire resistance of GRACFST columns. During the initial heating phase, GRACFST columns exhibited pronounced expansion deformation. The slower heating of the core concrete in GRACFST column specimens initially suggests superior high-temperature resistance of geopolymeric recycled aggregate concrete. Finite element analysis (FEA) models were established to analyze the fire performance of GRACFST columns under multi-loading conditions, and the accuracy of FEA model was validated by comparing with the test results. The FEA modelling method was then extended to simulate full-size GRACFST columns under similar fire and multi-loading conditions, and the failure modes, temperature distribution, deformation characteristics and stress development trends in GRACFST columns were discussed. Finally, parametric analyses were conducted, selecting axial load ratios, horizontal load ratios, section dimensions, and slenderness ratios as key parameters for fire resistance calculations. A parametric analysis identified the influence of these parameters on the fire resistance of GRACFST columns, leading to the development of a simplified method for calculating fire resistance under compression-bending-shear multi-loading conditions.
Keyword:
Reprint Author's Address:
Email:
Source :
ENGINEERING STRUCTURES
ISSN: 0141-0296
Year: 2025
Volume: 331
5 . 5 0 0
JCR@2022
Cited Count:
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 10
Affiliated Colleges: