Behavior of a Novel Circular HSC Column with Double High Strength Spirals

Yang, Fang; Sun, Lijun; Zhao, Junliang; Wu, Dongyan; Li, Wei

doi:10.1260/1369-4332.18.9.1371

Cited by 9 publications

(8 citation statements)

References 26 publications

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“…In recent years, the author's research team conducted axial compression loading tests of confined concrete column confined with two layers of stirrups. The experimental results showed that the column exhibited high ductility and bearing capacity due to the confinement of two‐layer stirrups.…”

Section: Introductionmentioning

confidence: 99%

Cyclic behavior of reinforced concrete columns confined with two layers of stirrups

Sun

2019

Structural Concrete

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Reinforced concrete (RC) columns confined with two layers of stirrups (TS) are a novel type of RC column, which consist of two layers of stirrups and longitudinal reinforcement. In this paper, the seismic behavior of TS-RC columns is investigated through a series of experiments, in which six one-half-scale column specimens were subjected to axial forces and lateral cyclic loading. For comparison, an additional six specimens are included in Li et al. The design and details of all specimens correspond to the same, except for the axial compressive load ratio. The test variables include the axial compressive load ratio applied to the columns, the cross-section type, and the spacing of transverse reinforcement. All specimens failed in a flexural mode, showing stable hysteresis loops. Because of the confinement of the two layers of stirrups, the TS-RC column specimens exhibit excellent ductility and dissipated energy even at the axial load ratio of 0.4. The lateral forcedrift relationships, backbone curves, energy dissipation, displacement ductility, stiffness degradation, final damage observed, and damage index are presented and discussed. K E Y W O R D Saxial load ratio, column, confinement, cyclic loading, ductility, seismic behavior, two layers of stirrups

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Section: Introductionmentioning

confidence: 99%

Cyclic behavior of reinforced concrete columns confined with two layers of stirrups

Sun

2019

Structural Concrete

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“…Although a few very fine researchers on assessment of doubly confined concrete columns exists. None of them has applied Non Destructive methods of testing e.g., researches in [3], [22], [23], [24] and [25]. Further the authors' current research provides an opportunity studying the impact upon largest number of samples so far.…”

Section: Introductionmentioning

confidence: 99%

Reliability of Non-Destructive Testing Methods in the Assessment of the Strength of Concrete Columns Reinforced with Two Layers of Transverse Confining Stirrups: Empirical Evidence

Kumar¹,

Zaidi²,

Jain³

et al. 2019

IJRTE

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Wide spread literature is available on the approach to assess the strength of Reinforced Concrete structures. However no attention has been made so far to study the similar potential when the RC columns are reinforced with double layer of transverse confining stirrups. An obvious reason could be that studies in double layered stirrups options are quite at their infancy. The authors took the advantage of their involvement in studying the axial compression behaviour in terms of strength and ductility of concrete columns reinforced with double layered transverse confining stirrups, applied the two non-destructive measures, viz., Rebound Hammer Test Method (RHTM) and Ultrasonic Pulse Velocity Test Technique (UPVTT), and destructive testing measure, viz., Compression Testing Method (CTM) on the specimens that they have developed in this study. The results have been subjected to regression techniques to build relevant equations for predictability. The present study attempts to explain the detailed procedures adopted within the frame work of the informed knowledge and had attempted to derive meaningful implications for the use of practitioners and academic fraternity. The findings of this paper drew attention to the superior impact of a combined non-destructive testing approach whereby RHTM and UPVTT have been merged in a fashion to yield better assessment of RC columns with double layers of transverse confining stirrups. The combined influence of RHTM and UPVTT clearly explain, greater characteristic compressive strength as one moves from a specimen with a Normal Strength Concrete (NSC) to a specimen with High Strength Concrete (HSC).

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“…It has been well understood that lateral confinement can enhance the strength and ductility of concrete (Mander et al, 1988;Yang et al, 2015). From the experience of several destructive earthquakes (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative, the authors recently proposed a new column form, namely RC columns confined using two layers of stirrups (Yang et al, 2015), which features an outer and an inner layer of steel stirrups. Typical cross-section configurations of the columns are shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…(2) the buckling of the inner longitudinal reinforcement is well prevented by the outer concrete and the outer steel cage; (3) it can be constructed and connected with RC beams in the same way with that of traditional RC columns (Yang et al, 2015), without increasing much to the construction cost and difficulty; (4) finally, this column form is potentially easier to be accepted by practitioners as it has only slight difference with traditional RC columns with a single layer of stirrups.…”

Section: Introductionmentioning

confidence: 99%

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Axial compressive behavior of square reinforced concrete columns confined using two layers of stirrups

Sun

Yang

et al. 2016

Advances in Structural Engineering

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Reinforced concrete column confined using two layers of stirrups is a new kind of column form recently proposed by the authors. The concrete of the column is under three different levels of confinement, namely unconfined concrete cover, singly confined, and doubly confined concrete core. This column form provides a simple but effective solution for reinforced concrete columns located in seismic hazard zones and/or reinforced concrete columns with large axial load ratio, where large amount of transverse reinforcement is necessary to achieve a ductile response. This study aims to investigate the axial compressive behavior of square reinforced concrete columns confined using two layers of stirrups. In total, 15 columns were prepared and tested under axial compression. Two different stirrup configurations were investigated. The axial responses and the failure modes of the columns were examined in detail, and the average stress–strain curve of the singly confined and doubly confined concrete core was derived. A stress–strain model with satisfactory accuracy was proposed based on the interpretation of test results.

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Behavior of a Novel Circular HSC Column with Double High Strength Spirals

Cited by 9 publications

References 26 publications

Cyclic behavior of reinforced concrete columns confined with two layers of stirrups

Cyclic behavior of reinforced concrete columns confined with two layers of stirrups

Reliability of Non-Destructive Testing Methods in the Assessment of the Strength of Concrete Columns Reinforced with Two Layers of Transverse Confining Stirrups: Empirical Evidence

Axial compressive behavior of square reinforced concrete columns confined using two layers of stirrups

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