Effects of sustained axial load and cooling phase on post-fire behaviour of concrete-filled steel tubular stub columns

Huo, Jingsi; Huang, Guowang; Xiao, Yan

doi:10.1016/j.jcsr.2009.04.022

Cited by 96 publications

(50 citation statements)

References 20 publications

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“…Due to the concrete cracking, the secant compressive stiffness of CFST columns also decreases with increasing compressive load. Huo et al [33] and Yang et al [34] defined the compressive stiffness (EA) as the secant stiffness corresponding to the column strength of 0.4N u . This definition is also adopted in this paper to derive EA from N …”

Section: Proposed Model For Compressive Stiffnessmentioning

confidence: 99%

Strength, stiffness and ductility of concrete-filled steel columns under axial compression

Wang

Tao

Han

et al. 2017

Engineering Structures

241

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Extensive experimental and theoretical studies have been conducted on the compressive strength of concrete-filled steel tubular (CFST) columns, but little attention has been paid to their compressive stiffness and deformation capacity. Despite this, strength prediction approaches in existing design codes still have various limitations. A finite element model, which was previously proposed by the authors and verified using a large amount of experimental data, is used in this paper to generate simulation data covering a wide range of parameters for circular and rectangular CFST stub columns under axial compression. Regression analysis is conducted to propose simplified models to predict the compressive strength, the compressive stiffness, and the compressive strain corresponding to the compressive strength (ductility) for the composite columns. Based on the new strength prediction model, the capacity reduction factors for the steel and concrete materials are recalibrated to achieve a target reliability index of 3.04 when considering resistance effect only.

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Section: Proposed Model For Compressive Stiffnessmentioning

confidence: 99%

Strength, stiffness and ductility of concrete-filled steel columns under axial compression

Wang

Tao

Han

et al. 2017

Engineering Structures

241

View full text Add to dashboard Cite

show abstract

“…Before the tests, the ambient temperature was heating and 60 minutes' heating, respectively. The specimens were heated in an unstressed condition, which is considered to be more conservative than under load, when assessing the residual strength of concrete after fire exposure [18][19][20][21][22][23]. The top and bottom end plates were fully protected with ceramic fibre blankets for all specimens, including the stub columns used for measuring temperatures.…”

Section: Test Setup and Proceduresmentioning

confidence: 99%

Post-fire behaviour of slender reinforced concrete columns confined by circular steel tubes

Yang

Liu

Gardner

2015

Thin-Walled Structures

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Abstract:The post-fire behaviour of slender reinforced concrete columns confined by circular steel tubes is investigated experimentally and numerically in this paper. Experiments were performed firstly to explore the fundamental behaviour of steel tube confined reinforced concrete (STCRC) slender columns after exposure to the ISO-834 standard fire, including the cooling phase. Temperature distributions, load versus lateral displacement curves, strains in the steel tube and failure modes were obtained and discussed. Next, a 3D finite element model was developed with the program ABAQUS using a sequentially coupled thermal-stress analysis. After validation of the FE model, parametric studies were carried out to identify the influence of key parameters on the load-bearing capacity and buckling reduction factor of slender STCRC columns. The considered parameters were the heating time, cross-sectional dimension, slenderness ratio, material strength, steel tube to concrete area ratio and reinforcement ratio. Finally, a simplified design method was proposed for predicting load-bearing capacity of STCRC slender columns after exposure to standard fires. Yang, H., Liu, F., and Gardner, L. (2015). Post-fire behaviour of slender reinforced concrete columns confined by circular steel tubes.

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“…The specimens were placed in the furnace in an unstressed condition, which is considered to be more conservative than under load in terms of evaluating the residual strength of concrete after fire [15][16][17][18]. The top and bottom ends of the specimens, including the stub columns for measuring temperatures, were fully protected with ceramic fibre blankets to prevent heat being transferred into the specimens through the end plates.…”

Section: Test Conditions and Proceduresmentioning

confidence: 99%

Post-fire behaviour of reinforced concrete stub columns confined by circular steel tubes

Liu

Gardner

Yang

2014

Journal of Constructional Steel Research

102

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Abstract:Experimental and numerical studies into the structural behaviour of reinforced concrete columns confined by circular steel tubes after exposure to standard fire conditions are presented. These elements differ from conventional concrete-filled steel tubular (CFST) columns in that breaks in continuity are present at the member ends, which limit the longitudinal stresses in the steel and maximise the level of confinement afforded to the concrete through the generation of hoop stresses in the tube. The temperature distributions in the specimens were measured during the heating and cooling phases, while the load-displacement relationships and longitudinal and transverse strains in the steel tube were recorded during the subsequent compressive tests. 3D finite element (FE) models were also developed using the program ABAQUS to investigate the post-fire performance of circular steel tube confined reinforced concrete (CSTCRC) columns, including both heat transfer and stress analyses. The FE models were used to identify the influences of key parameters on the residual capacity of CSTCRC columns, following exposure to the ISO-834 standard fire. The considered parameters included heating time, cross-sectional dimensions, strength of the materials, steel tube to concrete area ratio and ratio of reinforcement. Finally, a design method was proposed for predicting the residual load bearing capacity and compressive stiffness of CSTCRC columns after standard fire exposure.

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Effects of sustained axial load and cooling phase on post-fire behaviour of concrete-filled steel tubular stub columns

Cited by 96 publications

References 20 publications

Strength, stiffness and ductility of concrete-filled steel columns under axial compression

Strength, stiffness and ductility of concrete-filled steel columns under axial compression

Post-fire behaviour of slender reinforced concrete columns confined by circular steel tubes

Post-fire behaviour of reinforced concrete stub columns confined by circular steel tubes

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