Prediction of stress–strain behavior of spirally confined concrete considering lateral expansion

Kim, Young-Seek; Kim, Sang Woo; Lee, Jung-Yoon; Lee, Jae-Man; Kim, Kil-Hee

doi:10.1016/j.conbuildmat.2015.11.017

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…These two functions of an FRP confining tube can, to a large extent, be achieved also by HSS spiral reinforcement with a yield stress around or above 1000 MPa. Indeed, existing research has shown that HSS spirals confine concrete very effectively like FRP tubes due to the large elastic range of HSS spirals (Lee et al, 2010;Li et al, 2001;Kim et al, 2016), but the former are much cheaper and much more ductile than the latter.…”

Section: Introductionmentioning

confidence: 99%

Compressive behavior of concrete-filled steel tubular columns with internal high-strength steel spiral confinement

Teng

Wang

Lin

et al. 2020

Advances in Structural Engineering

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Concrete-filled steel tubular (CFST) columns have been extensively studied and widely used in practice. Existing research has shown that non-circular CFST columns is much less ductile than their circular counterparts, particularly when thin/high strength steel (HSS) tubes and high-strength concrete are used. To address this problem, a new form of CFST columns has recently been proposed by the first author. The new column consists of a steel tube filled with concrete that is confined with HSS spiral reinforcement typically with a yield stress exceeding 1000 MPa. These columns, referred to as confined concrete-filled steel tubular (CCFST) columns, also maintain the ease for connection to CFST or steel beams. This paper presents the results of a series of concentric axial compression tests on such columns of square cross-section to demonstrate their advantages. The experimental program included 13 CCFST columns, four CFST columns without internal spiral confinement, two hollow steel tube (HST) columns, and 11 circular HSS spiral-confined concrete columns. Three different compressive strengths and three HSS spiral pitches were examined in the experimental program. The CFST columns, HST columns, and HSS spiral-confined concrete columns were all tested under axial compression to gain a good understanding of the confinement mechanism in a CCFST column. The test results show that the new columns possess much greater ductility than those without internal spiral confinement, although the use of HSS spirals increases the steel volume by only a small percentage. It is also shown that the axial load-axial strain curve of a CCFST column can be conservatively predicted by summing the axial load-axial strain curves of the hollow steel tube without local buckling, the HSS spiral-confined concrete core, and the sandwiched concrete between the two.

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Section: Introductionmentioning

confidence: 99%

Compressive behavior of concrete-filled steel tubular columns with internal high-strength steel spiral confinement

Teng

Wang

Lin

et al. 2020

Advances in Structural Engineering

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“…In circular confined concrete columns, concrete dilated uniformly in lateral direction, spiral stirrups provided uniform confining pressure for core concrete 9 . The confining pressure provided by stirrups was closely related to concrete properties and stirrups properties.…”

Section: Introductionmentioning

confidence: 96%

“…Kwan et al 7,21 developed a new theoretical analytical model for analyzing the lateral stress–strain behavior of concrete‐filled steel tube columns and based on the proposed model, two types of ductility for confined concrete were defined. Besides, Kim et al 9 predicated the stress–strain behavior of confined concrete by considering lateral expansion and the proposed model had high accuracy in predicting the compressive behavior of confined concrete. Furthermore, other researchers 22–25 also proposed models for evaluating the lateral response of stirrups in confined concrete.…”

Section: Introductionmentioning

confidence: 99%

Lateral response of ultra‐high performance concrete columns confined with high‐strength spiral stirrups

Chang

Zheng

Hao

2020

Structural Concrete

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The lateral confinement of stirrups can effectively restrain the unstable lateral expansion of confined concrete and improve the load capacity and the ductility of concrete. The lateral response of stirrups affects the effective confinements on confined concrete and the dilation of core concrete. However, the lateral response of confined concrete has not received enough attention. In this paper, the lateral responses of 24 ultra‐high performance concrete (UHPC) and ultra‐high fiber‐reinforced performance concrete (UHPFRC) columns confined with high strength stirrups were obtained by experiments. The investigated parameters included concrete strength, stirrups volumetric ratio, and steel fibers contents. The axial stress‐lateral strain curves and lateral strain‐axial strain responses of specimens were presented to understand the dilation of concrete. The results showed that high strength concrete and high steel fibers contents decreased the dilation of concrete, when stirrups volumetric ratio increased from 1.0 to 2.0%, the dilation of concrete increased by 1.45~2.09 times. Furthermore, the lateral strain‐axial strain response prediction models were developed by introducing the effects of steel fibers, which were suitable for predicting the lateral strain‐axial strain of confined concrete.

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“…Past studies have showed that the lateral confinement capacity of columns is influenced by the amount and configuration of transverse reinforcement surrounding the core concrete, and by the yield strength, with circular cross-sections having better lateral confinement than square cross-sections [8][9][10][11][12]. However, columns are usually designed to have square cross-sections to enable joining with beams, and for more convenient longitudinal reinforcement configuration at the column-beam joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Configuration and Yield Strength of Transverse Reinforcement on Lateral Confinement of RC Columns

et al. 2021

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In general, the lateral confinement capacity of RC columns is influenced by the strength and configuration of transverse reinforcement. In this study, performed antisymmetric flexural moment experiments that simulated seismic loads, with the configuration and yield strength of the transverse reinforcement of RC square columns as main variables. The eight specimens were square cross-sections measuring 250 × 250 mm, and the lateral confinement effect in relation to main variables was examined by inducing flexural failure in the plastic hinge zone under a shear span-to-depth ratio (a/D) of 3.0. Transverse reinforcements comprised a square and octagonal S-series and tie-based H-series. The yield strengths of the transverse reinforcements were 453 MPa and 1053 MPa, respectively. Compared to the H-series, the S-series, whose configuration of transverse reinforcement is closer to a circular form, exhibited more prominent ductile behavior after flexural yield with increasing yield strength of transverse reinforcement, which indicates greater lateral confinement.

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Prediction of stress–strain behavior of spirally confined concrete considering lateral expansion

Cited by 12 publications

References 16 publications

Compressive behavior of concrete-filled steel tubular columns with internal high-strength steel spiral confinement

Compressive behavior of concrete-filled steel tubular columns with internal high-strength steel spiral confinement

Lateral response of ultra‐high performance concrete columns confined with high‐strength spiral stirrups

Effect of Configuration and Yield Strength of Transverse Reinforcement on Lateral Confinement of RC Columns

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