Bond stress-slip relationship in concrete-filled square stainless steel tubes

Dai, Peng; Liu, Yang; Wang, Jie; Lin, Manfang; Fan, Junwei

doi:10.1016/j.conbuildmat.2022.127001

Cited by 21 publications

(5 citation statements)

References 40 publications

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“…Final loading stage (Segment CD): With the continued increase in load, the steel tube and concrete experienced relative slip over the entire interface length range. As a result, the mechanical interlocking force between the interfaces was completely destroyed, the friction force became relatively stable, 36 and the interfacial bonding force augmented as the normal pressure on the interface increased. At this stage, the load‐slip curves exhibited a significant linear relationship.…”

Section: Test Results and Analysismentioning

confidence: 99%

Experimental study and numerical analysis of the interfacial bonding performance of T‐shaped concrete‐filled steel tubes

Bai,

Xie,

Shen

et al. 2023

Structural Design Tall Build

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SummaryThe effects of core concrete strength (C30, C40, and C50), steel tube length (600, 1000, and 1400 mm), and steel tube wall thickness (3, 4, and 5 mm) on the bonding performance of T‐shaped concrete‐filled steel tubes (CFSTs) were systematically investigated using push‐out test. Via the test, the patterns of the failure modes, load‐slip curves, stress‐slip curves, and distribution law of longitudinal strain were observed for the specimens, and the bond‐slip constitutive model for T‐shaped CFSTs was established. The test results indicate that the bond stress of T‐shaped CFSTs increases with the increase in concrete strength and tube wall thickness, while the steel tube length has less influence on the bond stress. In addition, non‐linear spring elements were used to simulate the interfacial bonding behavior based on the bond‐slip equation, which is in good agreement with the experimental curve results.

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Section: Test Results and Analysismentioning

confidence: 99%

Experimental study and numerical analysis of the interfacial bonding performance of T‐shaped concrete‐filled steel tubes

Bai,

Xie,

Shen

et al. 2023

Structural Design Tall Build

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“…The test results of ambient and post-fire bond strength of CFST columns [21][22][23][24][25][26] from the literature are shown in Figure 4 for comparison with Japanese, Chinese, and Eurocode values. It can be seen that bond strength in CFST columns has enhanced over the past decade.…”

Section: Figure 3 Typical Bond-slip Curve For Push-out Tests On Cfst ...mentioning

confidence: 99%

Bond Strength of Rectangular CFSST Columns after Exposed to Elevated Temperature

K.,

Santhi

2024

Civ Eng J

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This article investigates the bond- behavior of Rectangular Concrete-filled stainless-steel tubular (RCFSST) columns under post-fire conditions. The main objective of this research was to obtain τ-s relationship of RCFSST columns under the combined effects of high temperature and concrete age. A total of sixteen specimens, including four reference specimens, were tested with different parameters, namely: i) temperature (600 °C, 800 °C & 1000 °C) ii) different concrete ages (30 days, 60 days, 90 days & 180 days). Analyzing the τ-s curves of the test specimens, chemical adhesion and micro-locking were the principal forces contributing to bond strength at lower concrete ages under post-fire conditions. At a higher concrete age, RCFSST specimens displayed a longer curve after the inflection point, indicating the contribution of macro-locking forces in amplifying the bond-strength. Five distinct curve types were found from the experiments. Type 1 curves with three stages, i) initial linear, ii) non-linear, and ii) final linear stage, had a higher frequency among the other types. For 90-day cured specimens, a decline in bond strength was observed at higher temperatures, but for 180 days cured specimens, a significant rise was seen under post-fire conditions. A new set of τ-s relations for RCFSST columns with different concrete ages under post-fire was established. Doi: 10.28991/CEJ-2024-010-03-019 Full Text: PDF

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“…Dai revealed that steel tube-reinforced concrete exhibits good elastic-plastic and ductility performance [12]. Additionally, steel tube-reinforced concrete columns' ultimate bearing capacity increased by 73.6-112.1% compared to ordinary concrete columns.…”

Section: Introductionmentioning

confidence: 99%

The Corrosion Resistance of Concrete-Filled Steel Tubes with the Assembly Unit of Na2MoO4 and Benzotriazole

Wang,

Xu,

et al. 2024

Coatings

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Steel pipes are commonly used to strengthen the concrete’s load-bearing capacity. However, they are prone to corrosion in salt erosion environments. In this study, the influence of Na2MoO4 and benzotriazole on concrete-filled steel tubes’ corrosion performance is investigated. The steel pipes’ mass loss rates (MRs), ultrasonic velocity, electrical resistance, and the AC impedance spectrum and Tafel curves of concrete-filled steel tubes were used to characterize the degree of corrosion in the steel pipes. Scanning electron microscopy–energy-dispersive spectrometry and X-ray diffraction were used for studying the composition of steel pipe rust. The research results revealed that the NaCl freeze–thaw cycles (F-C) and NaCl dry–wet alternation (D-A) actions had a reducing effect on the mass and ultrasonic velocity of the concrete-filled steel tubes. After 300 NaCl F-C and 30 NaCl D-A, the MRs were 0%~0.00470% and 0%~0.00666%. The corresponding ultrasonic velocities were 0%~21.1% and 0%~23.6%. When a rust inhibitor was added, the results were the opposite. The MRs decreased by 0%~80.3% and 0%~81.6% with the added Na2MoO4 and benzotriazole. Meanwhile, the corresponding ultrasonic velocities were 0%~8.1% and 0%~8.3%. The steel tubes were corroded after 300 NaCl F-C and 30 NaCl D-A. The addition of rust inhibitors improved the corrosion resistance of the concrete-filled steel tubes by increasing the electrical resistance before NaCl erosion. The corrosion area rate decreased by using the rust inhibitors. The corrosion resistance effect of benzotriazole was higher than that of Na2MoO4. The concrete-filled steel tube with an assembly unit comprising 5 kg/m3 of Na2MoO4 and 15 kg/m3 of benzotriazole had the best corrosion resistance under the erosion induced by NaCl F-C and D-A. Rust inhibitors reduced the content of iron-containing crystals and iron elements. The specimens with 5 kg/m3 Na2MoO4 and 15 kg/m3 benzotriazole had the lowest concentration of iron-containing crystals and iron elements.

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Bond stress-slip relationship in concrete-filled square stainless steel tubes

Cited by 21 publications

References 40 publications

Experimental study and numerical analysis of the interfacial bonding performance of T‐shaped concrete‐filled steel tubes

Experimental study and numerical analysis of the interfacial bonding performance of T‐shaped concrete‐filled steel tubes

Bond Strength of Rectangular CFSST Columns after Exposed to Elevated Temperature

The Corrosion Resistance of Concrete-Filled Steel Tubes with the Assembly Unit of Na2MoO4 and Benzotriazole

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