Experimental Investigation of Full Scale Two-Layer Reinforced Concrete Beams

Iskhakov, I.; Ribakov, Yuri; Holschemacher, Klaus; Mueller, T.

doi:10.1080/15376494.2012.680673

Cited by 30 publications

(48 citation statements)

References 8 publications

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“…The application fields of two‐layer concrete beams, based on different static schemes and load conditions, were made known. Previous experimental stages included testing small‐scale beam models and full‐scale samples . A logical extension of these tests is the experimental investigation of a continuous TLB (CTLB), which is a focus of the current study.…”

Section: Research Background and Aimsmentioning

confidence: 99%

Experimental investigation of continuous two-layer reinforced concrete beams

Iskhakov

Ribakov

Holschemacher

2017

Structural Concrete

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Funding informationAlexander von Humboldt Foundation.Models and full-scale statically determinate two-layer beams (TLBs) made of steel-fiber high-strength concrete (SFHSC) in the compression zone and normalstrength concrete (NSC) in the tensile zone have been tested by the authors. The present study is a further stage of these investigations, focused on testing a continuous, two-span TLB with optimal steel/fiber ratio as in the previous stages. This is the first experimental investigation of continuous TLBs (CTLBs). The study is aimed at testing the CTLB behavior under positive and negative bending moments in the span and above the middle support. An additional issue that is studied in the course of this work is the influence of bending moment redistribution on the behavior of a CTLB. As in the previous research stages, interaction of the concrete layers in a CTLB was studied to demonstrate the efficiency of such beams for real structures. No cracks between the SFHSC and NSC layers were observed up to the ultimate limit state of the tested beam, which demonstrates proper interaction between the layers. The results obtained in the present study enable the recommendation of CTLBs for practical application as effective and economical continuous bending elements. K E Y W O R D Scontinuous two-layer beams, interaction between concrete layers, steel-fiber high-strength concrete | INTRODUCTIONAs is known, the main drawback of simply supported reinforced concrete (RC) beams is the relatively large moments in the span, which leads to large deflections and extensive cracking. Moreover, in simple statically determinate RC structures there is no internal moment redistribution, so the section in which the moment is maximum determines the load-bearing capacity of the structure. A solution to this problem is the use of continuous (statically indeterminate) RC structures that allow reduction of the maximum moment and deflection. In continuous beams, the moments above the supports and those in the span are redistributed, permitting the use of typical longitudinal reinforcement.One of the first theoretical works on continuous RC beams was carried out by Gvozdev, 1 which was focused on the load-bearing capacity of such beams. According to this method, each of the beam bays is loaded and the corresponding load-bearing capacity for the loaded bay is found. An equation for the calculation of the external bending moment in a certain loaded bay was proposed. The problem was solved for a beam with constant section dimensions by maximizing the internal forces. In a more general form, the problem of maximization of the internal forces for continuous RC beams was recently solved theoretically. Two-layer high-performance RC beams can be used in the traffic (longitudinal) direction of long-span bridges. The beam section consists of two parts: a bottom part made of normal-strength concrete (NSC), and an upper one made of steel-fiber-reinforced high-strength concrete (HSC). Using two-layer beams (TLBs) is logical because, as the beam span beco...

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Section: Research Background and Aimsmentioning

confidence: 99%

Experimental investigation of continuous two-layer reinforced concrete beams

Iskhakov

Ribakov

Holschemacher

2017

Structural Concrete

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“…Addition of high strength steel fibers to concrete results in better ductility and higher load carrying capacity, compared to concrete with normal strength steel fibers in the absence of main reinforcement bars [4]. Use of optimal steel fiber weight ratio in high strength concrete produces high performance bending elements having elastic-plastic behavior similar to that of normal strength concrete members [5].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of steel fiber reinforced high strength lightweight self-compacting concrete (SHLSCC)

Iqbal

Ali

Holschemacher

et al. 2015

Construction and Building Materials

197

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“…Employing this strategy led to a weak bond among geopolymeric mortar plates, CFRP sheets, and concrete beams. The previous studies in [3][4][5]7] indicated that not using composite layers in the transition zone improves the bond between cementitious layers. This can be attributed to further introduction of interfaces between layers.…”

Section: Evaluation Of Fe Models With Experimental Resultsmentioning

confidence: 99%

“…Thus, no experimental and numerical information could be found for modeling the transition zone between the geopolymer concrete and DHCC layer. However, since the results obtained in Section 5.1 and the previous studies in [3][4][5][6][7]16] con rmed that the transition layer could be modeled by a perfect bond between two concrete layers, in the FE models, a perfect bond was used for attaching the ber-reinforced plates to the plain geopolymer concrete beam. Table 3 lists the values obtained from implementation of an inverse analysis to de ne the trilinear tensile diagram of the DHCC layers and geopolymer concrete.…”

Section: Evaluation Of Fe Models With Experimental Resultsmentioning

confidence: 99%

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Increasing the flexural capacity of geopolymer concrete beams using partially deflection hardening cement-based layers: Numerical study

2017

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Abstract. Experimental research has demonstrated the great exural performance of de ection hardening cement-based composites for strengthening the beams. This paper numerically investigates the feasibility of adding thin de ection hardening ber-reinforced layers to the bottom of geopolymer concrete beams to enhance the exural performance. To properly predict the structural behavior and crack patterns of beams, the smeared crack approach was adopted to simulate the beams. The numerical simulations were executed in the FEM-based computer program. To validate the developed numerical models, the experimental test beams were numerically simulated with a cross section of two layers. Regarding the results obtained, the models would well predict the structural behavior and crack patterns of beams. To ensure the e ciency and accuracy of the adopted constitutive model in predicting the structural behavior and crack patterns of beams, the numerical FE models were used to simulate the added hardening de ection ber-reinforced layer to the bottom of geopolymer concrete beams. The numerical results revealed that adding a thin ber-reinforced layer to geopolymer concrete beams resulted in increasing ultimate load capacity, ultimate de ection, and ductility. The greatest enhancement in the exural performance of the strengthened beams was found in the ultimate load capacity of the strengthened beams.

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Experimental Investigation of Full Scale Two-Layer Reinforced Concrete Beams

Cited by 30 publications

References 8 publications

Experimental investigation of continuous two-layer reinforced concrete beams

Experimental investigation of continuous two-layer reinforced concrete beams

Mechanical properties of steel fiber reinforced high strength lightweight self-compacting concrete (SHLSCC)

Increasing the flexural capacity of geopolymer concrete beams using partially deflection hardening cement-based layers: Numerical study

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