Confined concrete with varying yield strengths of spirals

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

doi:10.1680/jmacr.16.00053

Cited by 8 publications

(10 citation statements)

References 12 publications

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“…Compared with the stress-strain models for NSS-confined concrete, only a small number of stress-strain models have been proposed for HSS-confined concrete (e.g. Akiyama et al, 2010;Assa et al, 2001;Kim et al, 2017;Li et al, 2001;Razvi and Saatcioglu, 1999). Some of these models were modified from Mander et al's (1988) model for application to both NSS-and HSS-confined concretes.…”

Section: Stress-strain Behavior Of Hsss-confined Concretementioning

confidence: 99%

“…Other models which employ a complex iterative process to generate the stress-strain curve (e.g. Kim et al, 2017) are not included in the discussions below. In making predictions using all the models, the experimental values of elastic modulus and axial strain at peak stress of unconfined concrete were used.…”

Section: Stress-strain Behavior Of Hsss-confined Concretementioning

confidence: 99%

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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: Stress-strain Behavior Of Hsss-confined Concretementioning

confidence: 99%

Section: Stress-strain Behavior Of Hsss-confined Concretementioning

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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“…provide a comparison of experimental and analytical results. In this study, existing models proposed by Mander et al (1988) and El-dash and Ahmad (1995) are used in this study to verify the accuracy of the model by Kim et al (2016). As seen in Table 4., the model proposed by Mander et al overestimates the test results for peak stress with a mean experimental-to-analytical ratio of 0.75, whereas it underestimates the peak axial stress with an average of 1.25.…”

Section: Comparison Of Experimental and Analytical Resultsmentioning

confidence: 99%

“…In this study, experimental results for confined concrete specimens with up to 100% replacement ratio of recycled aggregates are predicted using the analytical model proposed by Kim et al (2016), which predicts the stress versus axial strain relationship of confined concrete with spiral reinforcement using the relationship between axial and lateral strains at peak load. This model is able to consider the confinement effect of high-strength materials for strength and ductility enhancement of spirally confined concrete.…”

Section: Prediction Of Stress Versus Axial Strain Relationship 41 Analytical Modelmentioning

confidence: 99%

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Structural Performance of Recycled Aggregate Concrete Confined by Spiral Reinforcement

Kim¹,

Lee²,

Kim³

et al. 2018

Journal of Asian Architecture and Building Engineering

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This paper estimates the structural behavior of recycled aggregate concrete confined by spiral reinforcement. The main test parameters are designed to be the type of aggregates, replacement ratio of recycled aggregates, steel ratio and yield strength of spirals. Specimens subjected to concentrated axial load can be divided into two groups, natural and recycled aggregate specimens, based on the type of coarse aggregate used. The recycled aggregates are designed to be used from 0% to 100% in the specimens. Spiral reinforcement is varied up to 1.75% and 1,430 MPa for the steel ratio and yield strength of spiral, respectively. Furthermore, cover concrete and longitudinal reinforcement are neglected to estimate the pure capacity of recycled aggregate concrete confined by spiral reinforcement only. Test results showed that the structural performance of recycled aggregate concrete specimens confined by steel spirals was similar to that of natural aggregate concrete specimens, regardless of the replacement ratio of recycled aggregates, the steel ratio and the yield strength of the spirals.

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Review of studies on concrete columns confined by lateral reinforcement under axial compression and lateral cyclic loading

Hou

Zheng

2022

Structural Concrete

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The restraint of lateral reinforcement can effectively improve the bearing capacity and deformation capacity of confined concrete columns. Generally, the behavior of confined concrete column under axial compression and lateral cyclic loading is a complex process and has been the subject of numerous studies dating from last century. This paper presents a review to summarize and discuss the investigations of concrete columns confined by lateral reinforcements under axial compression and lateral cyclic loading with the aim of obtaining a clear understanding on the mechanism and performance of confined concrete column. In this paper, a test database of confined concrete columns under axial compression and lateral cyclic loading is established, presented, and evaluated. The detailed provisions of confined concrete columns from current codes are concluded and it is found that these codes neglect the beneficial effect of lateral reinforcement on shear bearing capacity of confined concrete columns under lateral cyclic loading. Additionally, the stress–strain models and development of lateral reinforcement strain/stress in confined concrete columns under axial compression are mainly presented and discussed. Moreover, theoretical and experimental studies on seismic behavior of confined concrete columns are evaluated, including compression‐flexure calculation, shear bearing capacity, ductility, energy dissipation capacity, and other detailed requirements. Furthermore, main influential factors of confined concrete columns under axial compression and lateral cyclic loading are discussed, respectively and it is founded that the synergy work of longitudinal and lateral reinforcement, and the deformation coordinated relationship between lateral reinforcement and core concrete significantly affect the bearing capacity and deformation capacity of confined concrete columns. Therefore, further studies are suggested to optimize and quantify the strength grade combination relationship between lateral reinforcement, longitudinal reinforcement, and concrete to achieve economical design and construction.

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Confined concrete with varying yield strengths of spirals

Cited by 8 publications

References 12 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

Structural Performance of Recycled Aggregate Concrete Confined by Spiral Reinforcement

Review of studies on concrete columns confined by lateral reinforcement under axial compression and lateral cyclic loading

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