Study of Circular Reactive Powder Concrete-filled Steel Tube Stub Columns under Axial Compression

Luo, Hua; Wang, Weiwei; Wang, Guanghui; Pang, Bo

doi:10.25103/jestr.115.18

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Concrete-Filled Steel Tube. Concrete-filled steel tube (CFST) columns are an increasingly popular method of supporting huge compressive loads in buildings [10,11]. e remaining strength of the CFST short column can be used to evaluate the potential damage caused by the fire and provide the least structural fire protection for the repair after the fire [12].…”

Section: D-shaped Steel Tube Concretementioning

confidence: 99%

D‐Shaped Concrete‐Filled Steel Tube Structure in Bridge Engineering

Liu

Wang²,

Bi³

et al. 2021

Advances in Civil Engineering

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With the continuous progress of the construction industry, the requirements for concrete in the bridge engineering are getting higher and higher. This research mainly discusses the detection of D-shaped concrete-filled steel tube structure in bridge engineering. In this study, the D-shaped concrete-filled steel tube member was used as the research object, and the load-displacement curve of the D-shaped concrete-filled steel tube compression-bending member was analyzed by the fiber model program. In the determination of the bonding state of the concrete-filled steel tube interface, in order to avoid the impact of mechanical and manual vibrating and the difference in concrete pouring methods on the test, the study uses C60 self-compacting microexpansion concrete. While pouring the specimens, three sets of cube specimens with a side length of 100 mm are reserved to determine the mechanical properties of the concrete simultaneously. In the temperature shock measurement of the concrete-filled steel tube specimen, the concrete-filled steel tube specimen was placed in a resistance heater during the simulated heating stage and heated to 20°C, 40°C, 60°C, and 80°C at room temperature. When measuring the mechanical properties of the specimen under the axial load, the specimen is heated from room temperature to the temperature of the entire section to reach 20°C, 40°C, 60°C, and 80°C. After preloading, the load of each level is 10t for continuous operation. Load and record the strain of the steel pipe and concrete under each load. If only the radial effect of the steel tube on concrete is considered, the temperature of 11°C, 20°C, and 80°C is the best ambient temperature. The results show that the D-shaped steel tube concrete interface state can provide a certain theoretical and experimental reference for the optimization of the steel tube concrete interface, ensuring the long-term working performance of the steel tube concrete under the harsh environment.

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Section: D-shaped Steel Tube Concretementioning

confidence: 99%

D‐Shaped Concrete‐Filled Steel Tube Structure in Bridge Engineering

Liu

Wang²,

Bi³

et al. 2021

Advances in Civil Engineering

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“…By analyzing equation (14), we can see that when there is no CFRP confinement, we obtain the expression N up = (1 + aξ s ) A c f c for deriving the bearing capacity of the CFST (Han, 1997). The core concrete in this paper is RPC, so we adopted equation (15), which was derived from 107 RPCFSTs synthesized in a previous study (Luo, 2015), to calculate the bearing capacity of RPCFSTs:…”

Section: Prediction Of the Bearing Capacity Of Cf-rpcfstmentioning

confidence: 99%

Behavior of CFRP-confined reactive powder concrete-filled steel tubes under axial compression

Song

Jiao

2020

Advances in Structural Engineering

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Reactive powder concrete-filled steel tubes (RPCFSTs) have become an important research target in recent years. In engineering applications, RPCFSTs can provide superior vertical components for high-rise and tower buildings, thereby enabling developers to provide more floor space. However, this type of composite structure is prone to inelastic outward local buckling. The use of carbon fiber reinforced polymer (CFRP) wrapping to suppress such local buckling has shown great potential in limited test results. This paper presents experimental results concerning the axial compression of CFRP-confined reactive powder concrete-filled circular steel tubes (CF-RPCFSTs). We included 18 specimens in our experimental investigation, varying the number of CFRP layers, steel tube thickness, and RPC strength. According to our test results, CF-RPCFSTs exhibit compression shear failure and drum-shaped failure. The CFRP wrap can effectively enhance bearing capacity and postpone local buckling of the steel tube. In addition, three-layer CFRP-confined RPC-filled thin-wall steel tubes are suitable for engineering. We also propose a model to calculate the bearing capacity of CF-RPCFSTs. Compared to the existing model of CFRP-confined concrete-filled steel tubes, the results obtained using the proposed model are in good agreement with our experimental results.

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“…Many studies have focused on the experimental determination of the axial compression performance and ultimate bearing capacity of RPCFTs. e present study collated the experimental results of past studies on the axial compression performance of 139 RPCFTs during 2003 to 2016, including Meng Shiqiang [8], Zhang Jing [9], Yang Wusheng [10], Wu Yanhai [11], Feng Jianwen [12], Yan Zhigang [13], Luo Hua [14], Yang Guojing [15], and Jian Wei [16]. Among the studies, tube diameter, wall thickness, and strength varying between 102 mm and 273 mm, 1 mm and 12 mm, and 210 MPa and 425 MPa, respectively, were considered to cause variation of the steel tube confining coefficient (ξ) in the range of 0.057-2.312.…”

Section: Overview Of Experimentsmentioning

confidence: 99%

Comparative Study on the Axial Compression and Bearing Capacity of Reactive Powder Concrete‐Filled Circular Steel Tube

Chen

Hou

2018

Advances in Materials Science and Engineering

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Reactive powder concrete (RPC) was confined by the circular steel tube to obtain the required ductility. The axial compression test results of 139 columns from different scholars were collated and compared to study the axial compression and bearing capacity of a reactive powder concrete-filled circular steel tube, of which the confining coefficient is 0.057–2.312 and the RPC strength is 76.6–178.2 MPa. Load-displacement curves have been categorized into four stages: (1) elastic; (2) elastic-plastic; (3) descending; and (4) strengthening. The failure mode can be divided into three types according to the different confining coefficients as (1) wall buckling; (2) diagonal shear; and (3) drum-shaped. The confining coefficient, core RPC strength, steel fiber volume, steel tube D/t ratio, and loading mode on the ultimate bearing capacity were analyzed. The results showed the confining coefficient to be the main factor affecting ultimate bearing capacity. The equation for determining ultimate bearing capacity was established based on the limit equilibrium theory, with the lateral confining coefficient of RPC (k) determined to be 2.86, less than that of normal concrete at 4.1. Based on the experimental analysis results and China’s “Design and Construction Code for Concrete-Filled Steel Tube Structure” (CECS 28-2012), the design proposal for an RPC-filled steel tube was recommended.

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Study of Circular Reactive Powder Concrete-filled Steel Tube Stub Columns under Axial Compression

Cited by 5 publications

References 14 publications

D‐Shaped Concrete‐Filled Steel Tube Structure in Bridge Engineering

D‐Shaped Concrete‐Filled Steel Tube Structure in Bridge Engineering

Behavior of CFRP-confined reactive powder concrete-filled steel tubes under axial compression

Comparative Study on the Axial Compression and Bearing Capacity of Reactive Powder Concrete‐Filled Circular Steel Tube

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