effect of spiral spacing and concrete strength on behavior
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effect of spiral spacing and concrete strength on behavior .

Effect of Spiral Spacing and Concrete Strength on

Hollow concrete columns (HCCs) are one of the preferred construction systems for bridge piers, piles, and poles because they require less material and have a high strength-to-weight ratio. While spiral spacing and concrete compressive strength are two critical design parameters that control HCC behavior, the deterioration of steel reinforcement is becoming an issue for HCCs.

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Effect of Spiral Spacing and Concrete Strength on

Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

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Effect of spiral spacing on axial compressive behavior

Spiral spacing has a considerable effect on increasing the post-peak ductility of RCFST columns. Decreasing of the spiral spacing considerably increases the post-peak ductility of the RCFSTs. When the concrete strength increases, ultimate strength increases but the ductility decreases, due to the brittleness of the higher strength concrete.

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Effect of spiral spacing on axial compressive behavior

2019-6-25  Spiral spacing has a considerable effect on increasing the post-peak ductility of RCFST columns. Decreasing of the spiral spacing considerably increases the post-peak ductility of the RCFSTs. When the concrete strength increases, ultimate strength increases but the ductility decreases, due to the brittleness of the higher strength concrete. Arranging spirals, even with a rather small amount of spirals, is an economical and easy solution for improving the ductility of RCFST

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STR-827: SHEAR STRENGTH OF CIRCULAR CONCRETE

2020-10-13  spiral-reinforcement ratio (spiral spacing and size) on the shear strength and behavior of circular concrete beams. Each beam was simply supported over a 2,400 mm span and had a total length of 3,000 mm, an equivalent effective

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Mechanical behavior of spiral stirrup reinforced

The test results show that the spiral stirrup has excellent cooperation ability with square steel tube and concrete, can effectively improve the non-uniform confine of square steel tube and enhance the confine effect on concrete. Furthermore, decreasing the spacing of spiral stirrup can enhance the axial bearing capacity and ductility of SSRCFSST columns, but has little effect on the eccentric bearing capacity.

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Reinforced Concrete Columns Confined by Circular

1993-9-1  An increase in the volumetric ratio of spiral steel was found to significantly improve strength and ductility of confined concrete, the effect on ductility being more pronounced. The maximum effect of spiral steel spacing was observed for the amount of spiral steel, which was approximately equal to that required by the ACI code.

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Behavior of eccentrically loaded square spiral

2020-8-1  In comparison to tie reinforcement, spiral reinforcement is more effective in confining the concrete core because tie reinforcement cannot effectively resist the concrete lateral expansion away from the tie points ; moreover, spiral reinforcement is commonly used in engineering practice, and high-strength spirals (the yield strength f yp > 1200 MPa) for high confinement is also readily available. Therefore, this study was focused on the application of spiral reinforcement

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Effect of the transversal-spacing of stirrup-legs on the ...

2020-11-30  This study recommends that the transversal-spacing of stirrups-legs of these beams has an influence on their strength and behavior and should not exceed the lesser of 0.56(d) or 170 mm (6.7 in.).

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Research on uniaxial compressive behavior of

2020-9-29  Transverse reinforcement and steel fibers had a combined effect on improving the post-peak behavior. Reducing the stirrup spacing or increasing the steel fibers volume content can better improve the axial compressive behavior of columns. A new constitutive model for confined UHPC was proposed.

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Effect of spiral spacing and concrete strength on

Hollow concrete columns (HCCs) are one of the preferred construction systems for bridge piers, piles, and poles because they require less material and have a high strength-to-weight ratio. While spiral spacing and concrete compressive strength are two critical design parameters that control HCC behavior, the deterioration of steel reinforcement ...

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Behaviour of high-strength concrete columns

2017-11-15  A total of 18 high strength concrete columns confined by spiral reinforcement were tested under concentric compression. The confined concrete circular specimens were produced using 4 longitudinal reinforcements (18 mm dia.).In these specimens spiral reinforcements had a diameter of 8 mm and were spaced at 55 mm, 80 mm, 110 mm, 160 mm.The specimens index from 1 to 4 are for 4 spacing

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STR-827: SHEAR STRENGTH OF CIRCULAR CONCRETE

2020-10-13  spiral-reinforcement ratio (spiral spacing and size) on the shear strength and behavior of circular concrete beams. Each beam was simply supported over a 2,400 mm span and had a total length of 3,000 mm, an equivalent effective

Get Price

Reinforced Concrete Columns Confined by Circular

1993-9-1  An increase in the volumetric ratio of spiral steel was found to significantly improve strength and ductility of confined concrete, the effect on ductility being more pronounced. The maximum effect of spiral steel spacing was observed for the amount of spiral steel, which was approximately equal to that required by the ACI code.

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Effect of the transversal-spacing of stirrup-legs on the ...

2020-11-30  Effect of the transversal-spacing of stirrup-legs on the behavior and strength of shallow concealed RC beams Ayed Eid Alluqmani (Department of Civil Engineering, Faculty of Engineering, Islamic University in Madinah , Madinah, Saudi Arabia )

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Compression behavior of concrete columns confined

2014-3-15  Ahmad and Shah investigated the influence of compressive strength, aggregate type, and the spacing and yield strength of hoop reinforcement on spiral confined concrete. Mander et al. [20] , [21] tested and modeled the longitudinal stress–strain behavior of the nearly full-size confined concrete with spiral reinforcement.

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Research on uniaxial compressive behavior of

2020-9-29  Research on uniaxial compressive behavior of high-strength spiral stirrups confined circular ultra-high performance concrete columns ... 14 confined UHPC columns and seven unconfined UHPC columns were tested to investigate the effects of the stirrup spacing, stirrup yield strength, and steel fibers volume content on the compressive behavior of ...

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Shear Behavior of Tied and Multi-Spiral Columns with

The square hoops columns and multi-spiral columns are tested under 20% and 10% axial load ratio, respectively. Concrete compressive strength (70 MPa and 100 MPa) and spacing of the transverse reinforcement are two parameters that will be examined.

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Compressive behavior of concrete confined by CFRP

2015-2-8  This study presents the results of an experimental investigation of 18 short concrete columns confined by carbon fiber-reinforced polymer (CFRP) and transverse spiral reinforcement (TSR) under uniaxial compression. Longitudinal rebars are not installed in the specimens in order to eliminate their confinement effect to concrete which affects the analysis of 3-D compression of concrete. The ...

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Influence of Shear Span-to-Effective Depth Ratio on ...

2021-2-16  The shear span-to-effective depth ratio (a/d) is one of the factors governing the shear behavior of reinforced concrete (RC) beams, with or without shear reinforcement. In high-strength concrete (HSC), cracks may propagate between the aggregate particles and result in a brittle failure which is against the philosophy of most design guidelines. The experimental results of six HSC

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Influence of masonry strength and rectangular spiral

2014-5-13  The effect of two types of shear reinforcement of the concrete members and two types of masonry infills on the seismic performance of reinforced concrete (RC) frames was experimentally investigated. Six single-story, one-bay, 1/3-scale frame specimens were tested under cyclic horizontal loading, up to a drift level of 40‰.

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Tests of Concrete Bridge Columns with Interlocking Spiral ...

The behavior of concrete bridge columns incorporating inter­ ... 1 is the radius of the spiral reinforcement. The spacing cri­ ... four corners of the column and outside both points of spiral intersection to minimize strength losses due to spalling in these areas. The unconfined longitudinal bars are tied into the in­

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Shear Behavior of Tied and Multi-Spiral Columns with

The square hoops columns and multi-spiral columns are tested under 20% and 10% axial load ratio, respectively. Concrete compressive strength (70 MPa and 100 MPa) and spacing of the transverse reinforcement are two parameters that will be examined.

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Stress-Strain Behavior of Steel Fiber-Reinforced

2018-4-26  The compressive strength of concrete according to certain codes can be based on the compressive strength of unconfined plain standard concrete cylinders tests at the age of 28 days. In this paper, the standard concrete cylinders were spirally confined with steel bars and with/without hooked-end steel fibers. The influence of the use of hooked-end steel fiber in spirally confined concrete with ...

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Article: Finite element analysis of confined high

2018-7-4  The developed model is used to investigate the effect of spiral spacing, γ (ratio of the core diameter to the whole cross section diameter) and compressive strength on behaviour of circular spiral reinforced concrete column confined with opposing spiral reinforcements.

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Confined Effect of Spiral Steel on the Bond Strength

This study investigates the bond strength of tension lap splice of self-compacted concrete (SCC) beam with various confining reinforcement. Four beam specimens were cast with SCC for test, in which three kinds of confined conditions were selected. Results indicate that the spiral steel at the tension lap splice presents similar confined effect as that of the transverse stirrups with same pitch.

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8. Short Columns8. Short Columns - Seoul National

2018-1-30  • The increase in compressive strength of the core concrete provided the confining effect of spiral steel. (E i i l ti )(Empirical equation) *'085 40 ff fcc−=0.85 4k = .0 2 (5) where f c *=compressive strength of spirally confined core concrete 0.85f ck=compressive strength of unconfined concrete f 2 ’=lateral confinement stress in core ...

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Effect of Matrix Ductility on Deformation Behavior of ...

2019-9-10  cementitious composites and concrete have similar ranges of tensile and compressive strengths (4 to 6 MPa and 30 to 80 MPa, respectively); however, their tensile deformation behavior is distinctly different. Whereas concrete in tension fails in a brittle manner upon reaching its cracking strength

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Cracking and Tension Stiffening Behavior of High

2016-11-7  This observation is contrary to the current design provisions, and the reduction in the tension stiffening effect by employment of high-strength concrete is much greater than that would be expected. Based on the present results, a modification factor is proposed to account for the effect of the cover thickness and the concrete strength.

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Effect of Deformation Height and Spacing on Bond

The details are described of a study of the effect of deformation pattern on bond strength usign 1 inch diameter machined bars with deformation heights of 0.05, 0.075, and 0.10 inch and deformation spacings ranging from 0.26 to 2.2 inch. The study found that the bond force-slip response of reinforcing bars is a function of the relative rib area of the bars, independent of the specific ...

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