Fire resistance of concrete-filled steel tube columns with preload. Part I: Experimental investigation

Yu, Min; Tan, Wei; Huang, Weijun; Yuan, Hongyong; Ye, Jianqiao

doi:10.1016/j.compstruct.2019.110994

Cited by 18 publications

(19 citation statements)

References 15 publications

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“…As one of the structural components of CFT structures, CFT columns play an important role in CFT structures systems. Plenty of studies have been conducted on the properties of the CFT column, including compressive behavior [13][14][15], bond behavior [16][17][18][19], seismic performance [20,21], fire resistance [22][23][24], and so on. Meanwhile, numerous different types of concrete have been also used in concrete-filled steel tubes, such as lightweight aggregate concrete [25,26], high-strength concrete [27], recycled aggregate concrete [28][29][30][31][32] and fiber-reinforced plastic (FRP)-confined concrete [33,34].…”

Section: Introductionmentioning

confidence: 99%

Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Zhou

et al. 2020

Materials

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In order to investigate the bond behavior of preplaced aggregate concrete-filled steel tube (CFT-PAC) columns and the difference of bond behavior between CFT-PAC columns and normal concrete-filled steel tube (CFT-NC) columns, a total of 11 columns were prepared and the push-out tests were conducted. The experimental parameters included the type of concrete (preplaced aggregate concrete and normal concrete), concrete strength (C40, C50 and C60), cross-section dimension (D = 219 mm, 299 mm and 351 mm) and the thickness of steel tube (t = 6 mm and 8 mm). The results indicated that the CTF-PAC columns had a similar load-slip curves with CFT-NC columns. The bond stresses of the CFT-PAC columns were higher than that of the PAC-NC columns at the same concrete strength. Increasing compressive strength of PAC increased the critical bond strength and bond strength of CFT-PAC columns. With an increase of the L/D ratio, both of the slip corresponding to peak load and bond strength of CFT-PAC columns exhibited an increasing trend. A rise in the D/t ratio led to a decrease in the bond stress of CFT-PAC columns and an increase in slip corresponding to the peak load of CFT-PAC columns. The proposed bond stress–slip relationship model considerably matched the bond stress–slip relationship of CFT-PAC columns.

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Section: Introductionmentioning

confidence: 99%

Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Zhou

et al. 2020

Materials

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“…Concrete-filled steel tube (CFST) structures with virtues of higher bearing capacity [1], greater ductility property [2][3][4], easier construction [5], better seismic performance [6,7] and much more excellent fire-resistant performance [8,9] are widely utilized in high-rise buildings, industrial plants, bridges and underground structures [10][11][12][13][14] recently. With application and popularization of CFST structures, significant economic and social benefits are obtained and a series of technical problems have been solved [2][3][4][5][6][7]15].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is meaningful to carry out the investigation on the structural properties of PAC-filled steel tube (PACFST) structures.The CFST column is one of the most widely used structural members in CFST structures. Recently, numerous researches have been conducted on structural properties of CFST columns, typically in compressive behavior [30][31][32], bond behavior [33,34], seismic performance [6,7], fire resistance [8,9,35]. Meanwhile, some design codes have been developed for design of CFST columns by different countries [36][37][38][39][40].…”

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confidence: 99%

Investigation and Application of a New Low-Carbon Material (Preplaced Aggregate Concrete) in Concrete-Filled Steel Tube Stub Columns

Zhou

2020

Sustainability

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As a new low-carbon material, development of preplaced aggregate concrete (PAC) will achieve huge economic and social benefits. However, few existing research is focused on applying PAC in structural elements. This paper is attempt to apply PAC in concrete-filled steel tube (CFST) stub columns and the bearing behaviors of PAC-filled steel tube (PACFST) stub columns under axial compression are also experimentally investigated. The results indicate that the failure modes of PACFST stub columns are all drum-like failure mode which are analogous to that of CFST stub columns. The axial load-axial strain curves of PACFST stub columns can be roughly divided into elastic stage, elastic-plastic stage and plastic stage. Under the similar ultimate load, the ultimate strains are a bit smaller than that of CFST stub columns. Comparison of the results of ultimate load of PACFST stub columns calculated using the existing relevant standards for the bearing capacity calculation methods of CFST stub columns, GB 50936 and JGJ 138 are much more suitable to assess the bearing capacity of PACFST stub columns. Approximately 15%~20% saving in cement consumption will be accomplished with popularization and utilization of PACFST stub columns as compared with CFST stub columns.PAC has higher coarse aggregate content and lower cement content at the similar compressive strength. Based on the above features, PAC has plenty of advantages, such as saving cement, reducing concrete shrinkage, increasing concrete stiffness and so on [22][23][24][25].With rapid development of infrastructures, the consumption of building materials increases fastly. A series of environmental issues caused by production of building materials are becoming more and more prominent. How to reduce the consumption of building materials has become one of the problems that needs to be solved urgently in construction industry. On the basis of the characteristic of PAC, applying PAC in structures may be one of the effective ways to cut down the consumption of cement in structures. Despite some existing literatures report that the PAC has been already used in underwater construction, massive concrete structures, concrete track construction and nuclear power plant structures [26][27][28], there is still a lack of investigation on application of PAC in widely used structures, such as building and bridge. As a new type of structural forms, CFST structures are widely used in buildings and bridges in recent years. Combined with the characteristic of PAC, using PAC to replace NC in preparation of CFST structural members may be benefit to reduce the consumption of cement in core concrete and will achieve a number of economic and social benefits. It will be a positive attempt to promote energy conservation and emission reduction in the construction industry. However, very few existing research is focused on this field, the most relevant research should be reported by Lv et al. [29], in which the bond behavior of PAC-filled steel tube columns has been studied only. It is still difficult ...

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“…Experimental study is generally the preferred method to study a CFST with preload [12,13] and its fireresistance [14][15][16][17] . A more detailed review on relevant experimental studies can be found in the companion paper [24] . It is also essential in the study of fire resistance of CFST to develop a reliable numerical model to replace expensive tests and simulate complex loading and support conditions.…”

Section: Introductionmentioning

confidence: 99%

“…It is also essential in the study of fire resistance of CFST to develop a reliable numerical model to replace expensive tests and simulate complex loading and support conditions. As a companion paper of [24] , this paper attempts to study the influence of preload on fire resistance of CFST both numerically and analytically. A finite element model on fire resistance of preloaded CFST, which is valid for both room and elevated temperature, is developed and validated against available test results.…”

Section: Introductionmentioning

confidence: 99%

Fire resistance of concrete-filled steel tube columns with preload. Part II: Numerical and analytical investigation

Tan

Huang

et al. 2019

Composite Structures

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Cast-in-situ concrete-filled steel tube (CFST) structures are inevitably subjected to preload that are developed in the steel tube during the construction process. These preloads may have detrimental effects on the overall performance of a CFST component, such as a CFST column, especially when the column is subjected to elevated temperature. However, existing design methods of CFST exclude the impacts of preload in fire resistance design. In this paper, a three-dimensional finite element model for predicting fire resistance of CFST with preload is developed and validated by experimental tests. The model is then used to predict fire resistance time of CFST columns with different slenderness, load and preload ratios. The results show that preload of the steel tube have little influence on the fire resistance of short CFST columns, while the influence of preload on the fire resistance can be significant when the slenderness ratio is greater. Further increase of the slenderness ratio exceeding a certain range, however, reduces the effect of preload. It can be generally concluded that fire resistance of slender CFST columns decreases with increase of preload ratios and the effect of preload on fire resistance of CFST columns is more prominent when the load ratio is greater. In addition, formulas for calculating fire resistance of cast-in-situ concrete-filled steel tubes (CFST) with preload are proposed. This paper is a companion paper of [24].

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Fire resistance of concrete-filled steel tube columns with preload. Part I: Experimental investigation

Cited by 18 publications

References 15 publications

Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

Investigation and Application of a New Low-Carbon Material (Preplaced Aggregate Concrete) in Concrete-Filled Steel Tube Stub Columns

Fire resistance of concrete-filled steel tube columns with preload. Part II: Numerical and analytical investigation

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