Analytical Study for Concrete Confinement in Tied Columns

Abdel‐Halim, Mohamed A. H.; Abu-Lebdeh, Taher

doi:10.1061/(asce)0733-9445(1989)115:11(2810)

Cited by 22 publications

(12 citation statements)

References 5 publications

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“…The concrete strength increases due to the confinement effect, which is basically lateral force that has the tendency to prevent the concrete from deforming in the lateral direction (Abdel-Halim and Abu- Lebdeh, 1989). Poisson's ratio of concrete is about 0.17 for normal strength concrete, which is defined as the ratio of the lateral strain to the longitudinal strain.…”

Section: Concrete Confinementmentioning

confidence: 99%

Experimental Study of Composite Beams Made of Steel Tubes Filled with Concrete under the Confinement Effect of U-Links and Stud-Plate

Al-Nasra¹,

Ammari²,

Abu-Lebdeh³

et al. 2017

American Journal of Engineering and Applied Sciences

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Abstract:Concrete strength improved substantially when lateral confinement stresses are provided. This effect has been exploited in this study in composite beams at the concrete compression zone. New type of confinement is used in this research. The confinement of concrete in the compression zone is accomplished by providing U-links and stud-plate systems. The U-links are steel bars in the shape of the letter U welded internally in a steel tube at the compression concrete zone. These tubes provide confinement effect similar to the stirrups used in reinforced concrete beams. The stud-plate element used in this study is made of steel bar welded to a horizontal plate at one of its end, while the other end is welded to the top of the steel tube at the compression zone from the inside of the tube. The main function of these two elements is to provide the concrete in the compression zone with confinement stresses. The composite beam is tested in bending under single load at the mid-span. The effect of the new confinement system is studied and compared with concrete filled tube without any confinement element. The failure mechanism is also a focus of this research along with the deflection at the mid-span of the beam. The effect of the new confinement system on the structural behavior of the composite beam is presented.

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Section: Concrete Confinementmentioning

confidence: 99%

Experimental Study of Composite Beams Made of Steel Tubes Filled with Concrete under the Confinement Effect of U-Links and Stud-Plate

Al-Nasra¹,

Ammari²,

Abu-Lebdeh³

et al. 2017

American Journal of Engineering and Applied Sciences

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“…However, frame A has wider spaced transverse reinforcement with higher tensile strength than frame B (Figure 23). Both structures are subjected to the earthquake strong-motion record from the Montenegro (Yugoslavia) earthquake of 15 April 1979.…”

Section: Comparisons For Transient Loadingmentioning

confidence: 99%

A new passive confinement model for the analysis of concrete structures subjected to cyclic and transient dynamic loading

Madas

Elnashai

1992

Earthq Engng Struct Dyn

114

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SUMMARYThe paper describes an analytical model for reinforced concrete members subjected to cyclic or transient dynamic loading. Model characterization is given in the context of a pseudo-spatial description of the stress state. This comprises a procedure for calculating and continuously updating the transverse confinement stress for a given applied axial strain, thus accounting for the passive confinement which an element of concrete is subjected to within a structural member.Comparison with existing uniaxial models shows that the new formulation takes note of previously neglected effects, such as non-coincident peaks of the steel and concrete stress-strain curves, and Poisson's ratio variation during loading. Moreover, comparison with 3D concrete constitutive relationships indicates that the level of accuracy is comparable, whilst significant computing time saving is achieved by the new model. Model validation is confirmed by comparison with cyclic loading laboratory test results. Finally, two frames with the same overall strength enhancement factor are analysed under earthquake loading; the difference in the response clearly demonstrates that the model accounts for important behavioural characteristics which are hitherto neglected in comparable existing models.

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“…The smeared and discrete formulations have been found to be unsuitable for complicated reinforcement grid geometries thus undergo several restrictions when implemented. On the other hand, the embedded reinforcement formulation provides the ability of representing the grid's geometry in an exact manner without the need of modifying the actual arrangement of rebars to conform with the concrete FE mesh [12][13].…”

Section: Introductionmentioning

confidence: 99%