Compressive behavior of thin-walled circular steel tubular columns filled with steel stirrup-reinforced compound concrete

Wu, Bo; Zhang, Q.; Chen, G.M.

doi:10.1016/j.engstruct.2018.05.028

Cited by 30 publications

(5 citation statements)

References 53 publications

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“…The specimens were poured horizontally. Before pouring, the DCLs were sprayed with tap water to wet them fully (Wu et al, 2008(Wu et al, , 2018a(Wu et al, , 2018d. The tied reinforcement cage put into the mould first, then DCLs and FC were added alternately with continuous vibration to ensure the compactness of the specimen (DBJ/T 15-113-2016, 2016).…”

Section: Fabrication Of Specimensmentioning

confidence: 99%

An experimental study of the axial compression performance of two-part precast concrete columns

Wei

2021

Advances in Structural Engineering

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Recycled lump concrete (RLC) made with demolished concrete lumps (DCLs) and fresh concrete (FC) provides a solution for effective waste concrete recycling. To promote the development of precast RLC structures, this study tested a new type of connection for precast concrete columns: connecting the upper and the lower halves of columns with bent longitudinal reinforcements and structural adhesive. In this work the behavior of precast RLC columns with the new connection was studied under axial compression. The axial compressive strength of nine two-part columns was tested. The effects of the degree of bending in the longitudinal reinforcement, the replacement ratio of DCLs and the stirrup spacing were investigated. Tests showed that: (1) the failure mode of precast concrete columns is different from that of cast-in-place columns; (2) when the strength of the waste concrete is close to that of the fresh material, there is no significant difference in the axial compression performance of either precast or cast-in-place columns; (3) the bent longitudinal reinforcement causes the axial load bearing capacity of precast concrete columns to be 4.2%–12.3% lower than that of a similar cast-in-place column; (4) reducing the stirrup spacing has little effect on a precast column’s axial load bearing capacity and ductility; (5) when using Chinese and American codes to predict the axial load bearing capacity of the column, the predicted value should be multiplied by a reduction factor.

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Section: Fabrication Of Specimensmentioning

confidence: 99%

An experimental study of the axial compression performance of two-part precast concrete columns

Wei

2021

Advances in Structural Engineering

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“…They found that the setting of the spiral hoop can improve the non-uniform restraint of the square steel pipe, delaying the onset of local buckling of the rectangular steel pipe, and the restraint is stronger than the vertical plate stiffening ribs. Wu et al [16] studied the compressive performance of a composite thin-walled circular section steel pipe column concrete with hoop reinforcement and found that the hoop reinforcement significantly improved the load-carrying capacity and ductility of the column. The seismic energy dissipation capacity of the spiral stirrup column led scholars to conduct low-frequency cyclic reciprocating load tests [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The Eccentric Compression Performance of Spirally Stiffened Thin-Walled Square Concrete-Filled Steel Tubular Laminated Composite Members

Wang

Wei

et al. 2022

Buildings

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To enhance the local buckling resistance of thin-walled steel pipes and enhance their fire and corrosion resistance, a new spirally stiffened thin-walled square concrete-filled steel tubular laminated composite member with transverse ribs is proposed. Through the four forms of combined members for eccentric pressure testing, it was found that: ordinary thin-walled steel pipe concrete drum buckling is more severe; with spiral ribs, the buckling is limited between the stiffening ribs; and the deformation is significantly reduced. By addressing the problem of cooperative work between the inner and outer structural layers of new components, it was found that, after setting constraints such as steel bars, the integrity of the two can be ensured, and the stress performance is significantly improved; compared to ordinary steel pipe concrete, the load-carrying capacity is 17.9% higher, and the deformation capacity is roughly equivalent. Spiral ribs as a new form of spatial restraint, in addition to increasing the local bending stiffness, manifest an overall restraint role in limiting lateral deformation of the steel pipe, whereas the role of vertical stiffness is insignificant. Based on test evidence, the influences of the width to thickness ratio of spiral ribs and pitch were determined, and reasonable structural measures for the members were given. Through the N–M relationship curve, the limit of damage in compression and tension under eccentricity was obtained at an eccentricity of about 0.9. Finally, a method for calculating the eccentric compressive ultimate load capacity of this new composite member was proposed.

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“…In addition, it was discovered from the research of Li that the desirable mechanical properties were possessed by the concrete cubes containing RCLs with a maximum lump size of 80 mm [3]. The test results obtained for the members containing RLC show comparable or slightly lower structural and seismic performance than those cast with only fresh concrete (FC) [27][28][29][30][31][32][33][34]. Based upon these findings, a success has been achieved over the past years in the structural applications of RLC for certain multi-storey buildings [19,28,31,32].…”

Section: Introductionmentioning

confidence: 99%

“…The test results obtained for the members containing RLC show comparable or slightly lower structural and seismic performance than those cast with only fresh concrete (FC) [27][28][29][30][31][32][33][34]. Based upon these findings, a success has been achieved over the past years in the structural applications of RLC for certain multi-storey buildings [19,28,31,32]. Up to now, there have been two technical standards published to provide guidance on the application of RLC in structure members [35,36].…”

Section: Introductionmentioning

confidence: 99%

The direct shear behavior of recycled lump concrete

2021

Mater Struct

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To study the direct shear behavior of recycled lump concrete, 116 prismatic specimens were fabricated and tested under double-direct shear loading. Four variables were considered: the replacement ratio of recycled concrete lumps, the characteristic ratio of recycled concrete lumps (i.e., the characteristic size of lumps as divided by the lateral dimension of prism), the prisms' lateral dimension and the strength of fresh concrete matrix. A formula has been established, which adequately predicts the direct shear strength of the recycled lump concrete. Moreover, a model presented describes the relationship between the size of the prism tested and the direct shear strength observed. The direct shear strengths of fresh concrete and recycled lump concrete present a smaller gap than the compressive strengths of them. With normal-strength concrete as the matrix, the ratio of the direct shear strength to the compressive strength for recycled lump concrete is about 0.91 times that for fresh concrete alone. With high-strength concrete as the matrix, the ratio is about 1.08 times. For a given size of specimen, the impact of lump size on the direct shear strength of the recycled lump concrete is basically negligible. At a given characteristic ratio of lumps, the size of specimen impacts on the direct shear strength of recycled lump concrete in a similar way to the direct shear strength of conventional concrete.

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Compressive behavior of thin-walled circular steel tubular columns filled with steel stirrup-reinforced compound concrete

Cited by 30 publications

References 53 publications

An experimental study of the axial compression performance of two-part precast concrete columns

An experimental study of the axial compression performance of two-part precast concrete columns

The Eccentric Compression Performance of Spirally Stiffened Thin-Walled Square Concrete-Filled Steel Tubular Laminated Composite Members

The direct shear behavior of recycled lump concrete

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