Load-reversed push-out tests on rectangular CFST columns

Qu, Xiushu; Chen, Zhihua; Nethercot, D.A.; Gardner, Leroy; Theofanous, Marios

doi:10.1016/j.jcsr.2012.11.003

Cited by 53 publications

(18 citation statements)

References 10 publications

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“…In this research study, the bond strength is also assumed to be the maximum average bond stress at the first breakaway point. Push-out-250-1 Push-out-250-2 Push-out-250-3 Push-out-500-1 Push-out-500-2 83 Shakir-Khalil, 1993b, Tao et al, 2011, Qu et al, 2013 the bond strengths from the current tests are very low. As will be explained in section 4.3.6.1, the new push-out test results will not be used in the numerical simulation of the load-introduction tests.…”

Section: Deformed Shapes and Failure Modes Of Load-introduction Testsmentioning

confidence: 69%

“…The bond between the steel tube and the concrete core can be considered a result of the following three different mechanisms (Johansson and Gylltoft, 2002, Wium and Lebet, 1994, Virdi and Dowling, 1975, Tao et al, 2011, Qu et al, 2013:…”

Section: Bond Definitionmentioning

confidence: 99%

“…Tables 2.1 and 2.2 present a summary of the existing bond test results (Tao et al, 2011, Shakir-Khalil, 1993a, Shakir-Khalil, 1993b, Qu et al, 2013, Xu et al, 2009, Aly et al, 2010, Parsley et al, 2000 for CFSTs with rectangular section, square section, and circular section ( -Khalil, 1993b) shows that the average maximum bond stress for the specimens with shear tabs is significantly higher, being more than four times that of the specimens without shear tabs with the same section dimensions and material properties. This is consistent for both circular and square hollow sections and demonstrates the favourable effects of the shear tabs in increasing the bond loading capacity as explained previously.…”

Section: Experimental Investigationmentioning

confidence: 99%

“…Typical bond stress-slip behaviour at the steel-concrete interface of push-out tests(Qu et al, 2013) …”

mentioning

confidence: 99%

See 3 more Smart Citations

New Mechanism of Load Introduction into Concrete-Filled Steel Tubular Columns

Mollazadeh

Wang

2016

J. Struct. Eng.

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Section: Deformed Shapes and Failure Modes Of Load-introduction Testsmentioning

confidence: 69%

Section: Bond Definitionmentioning

confidence: 99%

Section: Experimental Investigationmentioning

confidence: 99%

“…Typical bond stress-slip behaviour at the steel-concrete interface of push-out tests(Qu et al, 2013) …”

mentioning

confidence: 99%

See 2 more Smart Citations

New Mechanism of Load Introduction into Concrete-Filled Steel Tubular Columns

Mollazadeh

Wang

2016

J. Struct. Eng.

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“…13 .Comparable values from the literature (Virdi and Dowling 1975, Qu et al 2013, Chen et al 2009] of 10%-20% for square CFST specimens and 32%-75% for circular CFST specimens, respectively, have been reported. Based on the composition and variation in the interface bearing capacity, it can be assumed that the ultimate average bond stress for the lubricated specimens is derived, for the most part, from microlocking.…”

Section: Effect Of Interface Conditionmentioning

confidence: 89%

Push-out tests and bond strength of rectangular CFST columns

Qu¹,

Chen²,

Nethercot³

et al. 2015

Steel Compos. Struct.

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Abstract. Push-out tests have been conducted on 18 rectangular concrete-filled steel tubular (CFST) columns with the aim of studying the bond behaviour between the steel tube and the concrete infill. The obtained load-slip response and the distribution of the interface bond stress along the member length and around the cross-section for various load levels, as derived from measured axial strain gradients in the steel tube, are reported. Concrete compressive strength, interface length, cross-sectional dimensions and different interface conditions were varied to assess their effect on the ultimate bond stress. The test results indicate that lubricating the steel-concrete interface always had a significant adverse effect on the interface bond strength. Among the other variables considered, concrete compressive strength and cross-section size were found to have a pronounced effect on the bond strength of non-lubricated specimens for the range of cross-section geometries considered, which is not reflected in the European structural design code for composite structures, EN 1994-1-1. Finally, based on nonlinear regression of the test data generated in the present study, supplemented by additional data obtained from the literature, an empirical equation has been proposed for predicting the average ultimate bond strength for SHS and RHS filled with normal strength concrete.

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Experimental research on interfacial bonding performance of high‐strength steel pipe and surrounding concrete/grout for assembled composite columns

Zhu,

Wang

2023

Structural Concrete

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High‐strength steel pipe joints are proposed for assembled composite columns. The steel pipe extends into the upper and lower prefabricated columns and is anchored by poured concrete or grout to realize the connection of the prefabricated columns. Bonding performance of high‐strength steel pipe and surrounding concrete/grout is critical to the joint reliability. Steel pipe push‐out test was carried out, considering parameters of steel pipe section specification, bonding length, bonding material, and outer wall treatment of the steel pipe. Comparative analysis of measured load–displacement/slip curves and calculated bond strength were conducted. Bonding length of 600 mm could provide sufficient bond strength. Increasing bonding length could delay the slippage, but the bond strength decreased. High‐strength grout significantly increased the peak load size. The slenderness ratio and diameter–thickness ratio of the steel pipe had no obvious influence on the bonding performance. Steel pipe with D114*25 section obtained higher bonding strength with smaller ratio of bonding area to cross‐sectional area. Spiral ribs welded to the outer wall of the steel pipe could effectively improve the bonding strength and delay the interface slip. With easy construction and reliable performance, spiral ribs were recommended to be applied in prRactical projects.

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Load-reversed push-out tests on rectangular CFST columns

Cited by 53 publications

References 10 publications

New Mechanism of Load Introduction into Concrete-Filled Steel Tubular Columns

New Mechanism of Load Introduction into Concrete-Filled Steel Tubular Columns

Push-out tests and bond strength of rectangular CFST columns

Experimental research on interfacial bonding performance of high‐strength steel pipe and surrounding concrete/grout for assembled composite columns

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