Axial compression analysis of square concrete-encased concrete filled steel tubular stub columns after fire exposure

Xiang, Kai; Pan, Yan-chong; Wang, Guohui

doi:10.1016/j.proeng.2017.12.122

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…Wu [66] pointed out that the bond strength decreases more after 3 hours of heating, resulting in a decrease that is 61.2% of that at room temperature. Xiang et al [67] showed that the bond strength between the steel tube and concrete decreases obviously when the temperature rises to 200∼400 °C, and when the temperature rises to 400 °C, the bond strengths of the specimens with circular and square cross sections are 16% and 14% of those at a normal temperature, respectively. Fawzy et al [68] conducted tests at four temperatures (T � 25 °C, 70 °C, 200 °C, and 400 °C) and showed that the bond strength decreased with increasing temperature.…”

Section: Concrete Typementioning

confidence: 99%

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Interfacial Bond Performance of Concrete‐Filled Steel Tubes under Fire and Postfire Conditions: State‐of‐the‐Art Review

Xue

Chen

Cai

et al. 2021

Advances in Civil Engineering

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The critical influencing factors of the interface bonding properties of concrete-filled steel tubes (CFSTs) under fire and postfire conditions are analyzed. This paper analyzes and summarizes the existing research related to the bonding performance of CFST interfaces under fire and postfire conditions at home and abroad, which includes the bonding mechanism of CFST structures, the bonding strength of CFSTs during and after fire exposure, and the main factors influencing bond strength. The analysis results indicate that the temperature has noticeable influences on the bond strength of a CFST during and after fire exposure. The bond strengths of the specimens are reduced more severely under high-temperature conditions than after high-temperature cooling. Shear connectors can significantly improve the bonding performance of CFSTs and effectively reduce the relative slip between steel tubes and concrete. The paper concludes with an analysis of the deficiencies in bond-slip research on the bonding properties of the CFST interface during and after fire exposure and future research directions. First, we can study the use of new technologies and materials to solve the problem of bonding and slipping of CFSTs during and after fire exposure. Second, we can perform extensive experimental research and theoretical simulation analysis to enrich the research in this field, which can provide a reference for engineering practice.

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Section: Concrete Typementioning

confidence: 99%

“…Figure 3 shows the bond strength of each specimen after high-temperature exposure relative to that at normal temperature. e analysis results show that the bond strength of the specimens after high-temperature treatment is lower [64][65][66][67][68] or higher [69,70] than that at room temperature.…”

Section: Bondingmentioning

confidence: 99%

Interfacial Bond Performance of Concrete‐Filled Steel Tubes under Fire and Postfire Conditions: State‐of‐the‐Art Review

Xue

Chen

Cai

et al. 2021

Advances in Civil Engineering

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“…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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“…Square steel tubes and square tubiform columns, which are made of concrete, are commonly applied in the architectural aspect [1,2]. However, as steel is exposed to the environment, its strength drops significantly for high fire temperatures, with the structure rapidly losing its bearing capacity and failing to satisfy the requirements for fire-safe design of buildings, this also causes huge loss of human life and property [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Fire-resistance Rating of Square Steel Tubes and Concrete-filled Square Steel Tubular Columns Protected with Ultra-thin Fire-retardant Coating

Wu¹,

Zhang²,

Liu³

2020

Rev. Chim.

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To promote and criterionize the application of ultra-thin the fireproof coating s to building structures, four concrete-filled square steel tubular (CFSST) pillars as well as two square steel tubes, each protected along with ultra-thin the fireproof coating , were subjected to full-scale fire tests to investigate their fireproof level on the basis of the ISO 834 criterion time�degrees curve. Test results revealed not only the temperature variation characteristics of specimens suffered from inconsistent fire exposure, but also effects of the steel ratio of the test specimen and the number of fire-exposed sides on the fire-refractory level of the test specimen. Test results demonstrated that when protected with an ultra-thin the fireproof coating , the heating rate of the specimens was considerably lower than that of the test furnace, suggesting that the ultra-thin the fireproof coating exhibits good thermal insulation performance. The test results were compared with China�s current criterions for the fire-refractory level of square steel tubes and CFSST pillars, indicating that the criterions would lead to a relatively conservative fire-safe design for four-side fire exposure.

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Axial compression analysis of square concrete-encased concrete filled steel tubular stub columns after fire exposure

Cited by 9 publications

References 9 publications

Interfacial Bond Performance of Concrete‐Filled Steel Tubes under Fire and Postfire Conditions: State‐of‐the‐Art Review

Interfacial Bond Performance of Concrete‐Filled Steel Tubes under Fire and Postfire Conditions: State‐of‐the‐Art Review

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

Fire-resistance Rating of Square Steel Tubes and Concrete-filled Square Steel Tubular Columns Protected with Ultra-thin Fire-retardant Coating

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