Numerical analysis on mechanical property of concrete filled steel tube reinforced concrete (CFSTRC) columns subjected to ISO-834 standard fire

Bao, Yanhong; Xu, Lei; Wang, Wenda; Sun, Jing

doi:10.1007/s13296-017-1223-8

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…In a study on the fire resistance of CFSTRC columns, Liu et al (2009) carried out a numerical simulation on the temperature field of CFSTRC columns and the fire endurance of axial compression columns; Hou et al (2014) analyzed the working mechanism of the CFSTRC column in the entire fire process and presented a practical calculation table of the fire resistance, or time to cooling failure, of the CFSTRC column. Xu and Liu (2013) carried out fire resistance tests on four CFSTRC columns and, Bao et al (2017) on the basis of tests and FE analysis, put forward practical calculation formulas for the fire resistances of circular and square sections. Xiang et al (2017) analyzed the influence of concrete spalling on the fire resistance of CFSTRC column.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the fire resistance of concrete filled steel tube reinforced concrete (CFSTRC) column-RC beam frames

Bao

2021

Advances in Structural Engineering

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To reveal the temperature characteristics and mechanical properties of frame structures with concrete filled steel tube reinforced concrete (CFSTRC) columns under fire, the fire resistance of four planar frames consisting of CFSTRC columns and reinforced concrete (RC) beams subjected to ISO-834 standard fire was tested in this study. The test parameters included the column fire load ratio, beam fire load ratio, and beam-to-column linear stiffness ratio. In the test, the temperatures of the column, beam, and slab cross-sections in the joint and nonjoint zones were measured, and the fire resistance, beam and column deformation curves, and failure modes of the frame were investigated. The experimental results showed that the concrete volume was the main factor affecting the temperature distribution on each typical cross-section of the frame: the temperatures at the measuring points of the beam and column in the joint zone were significantly lower than the temperatures at the corresponding points in the nonjoint zone, and the concrete outside the steel tube significantly slowed the propagation of temperature to the steel tube and its concrete core. Hence, there was only a small loss of the bearing capacity of steel tube and the core concrete inside the steel tube. The column fire load ratio, beam fire load ratio, and beam-to-column linear stiffness ratio have obvious influences on the fire resistance: the larger the column fire load ratio or beam fire load ratio, the smaller the fire resistance; and the larger the beam-to-column linear stiffness ratio, the larger the fire resistance.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the fire resistance of concrete filled steel tube reinforced concrete (CFSTRC) column-RC beam frames

Bao

2021

Advances in Structural Engineering

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“…Xiang et al [ 6 ] carried out fire experiments on square ST-RC columns and analyzed the effects of the slenderness ratio, load ratio, and section size on their refractor performance. Bao et al [ 7 ] comprehensively analyzed the temperature change and internal force redistribution of ST-RC columns under fire using numerical simulation. Hou et al [ 8 ] considered the effect of rising and falling temperature, and summarized the failure pattern and internal force distribution of ST-RC columns during the entire process of fire.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fire Resistance of Square-Cased Square Steel Tube Reinforced Concrete (ST-RC) Columns

et al. 2021

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Based on the finite element (FE) analysis software Abaqus, an FE model of square-cased square steel tube reinforced concrete (ST-RC) columns under the hybridized action of high-temperature and load is established. The accuracy of the FE model is verified using experimental data from existing studies. This model is used to analyze the temperature change, internal force distribution, and failure characteristics of the square-cased square ST-RC columns under the action of fire, as well as the factors affecting the fire resistance limit of the column. The results of FE analysis show that under the action of fire, the maximum internal temperature of the square-cased square ST-RC columns occurs in the corner of the section. Moreover, the stress and strain reach their maximum values at the concrete corner outside the tube. During the heating process, an internal force redistribution occurs in the square-cased square ST-RC column. At the same time, the proportion of the axial force and the bending moment of the reinforced concrete outside the pipe decreases gradually, while the proportion of the internal force of the core concrete-filled steel tube (CFST) increases gradually. In essence, it is a process of load transfer from the high-temperature to the low-temperature zone. In addition, the section size, load ratio, slenderness ratio, cross-sectional core area ratio, steel content, and external concrete strength are the main parameters affecting the fire resistance limit of the square-cased square ST-RC columns. Among them, the cross-sectional core area ratio, section size, steel ratio, and external concrete strength are positively correlated with the fire resistance limit of the composite column. On the contrary, with the increase in the load ratio and the slenderness ratio, the fire resistance limit of the square-cased square ST-RC columns decreases. On this basis, a simplified formula to calculate the fire resistance limit of square-cased square ST-RC columns is proposed. The research results can be used as a theoretical reference for the fire protection design of this kind of structure in practical engineering.

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Fire resistance of concrete‐filled steel tube beam‐column under elevated temperatures and cyclic loading

Bayrak,

Maali,

Kılıç

et al. 2024

Structural Concrete

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This article aims to provide an overview of the fire resistance of concrete‐filled steel tube beam columns and the importance of fire resistance in building design and construction. Ten experimental models were developed to predict the behavior of different types of concrete‐filled steel tubes and beams‐columns under Fire resistance conditions (ISO‐834) under cyclic loading in two groups. The results show the type of concrete effect on moment‐rotation characteristics. Also, increasing the length of the stiffener on the column increases the load and moment capacity, but also affects the failure mode. Moreover, the ideal situation is to use PP fiber concrete in concrete‐filled steel tube structural elements where displacement and rotation capacity are prominent. Withal, the recycling of fire‐exposed steel beam‐to‐column tube element is available by filling the inner space with C50 and/or polypropylene fiber reinforced concrete, also as a fireproof member.

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Numerical analysis on mechanical property of concrete filled steel tube reinforced concrete (CFSTRC) columns subjected to ISO-834 standard fire

Cited by 9 publications

References 13 publications

Experimental study on the fire resistance of concrete filled steel tube reinforced concrete (CFSTRC) column-RC beam frames

Experimental study on the fire resistance of concrete filled steel tube reinforced concrete (CFSTRC) column-RC beam frames

Analysis of Fire Resistance of Square-Cased Square Steel Tube Reinforced Concrete (ST-RC) Columns

Fire resistance of concrete‐filled steel tube beam‐column under elevated temperatures and cyclic loading

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