The effect of concrete fatigue on the cyclic behaviour of composite dowels - derivation of a design approach based on experimental findings

Christou, George; Schmidt, Christopher; Hegger, Josef; Claßen, Martin

doi:10.1016/j.engstruct.2021.113743

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…The observations presented above underscore the necessity of a novel evaluation equation that incorporates consideration of the stress history influence. Christou et al (2022) established the multilinear skeleton curve of clothoid-shaped shear connectors based on pushout test results. Their study first proposed a shear stiffness evaluation equation.…”

Section: Applicability Of Evaluation Equations Proposed From Earlier ...mentioning

confidence: 99%

“…The multilinear function was constructed based on the normalized skeleton curves. For normalization, Christou et al (2022) defined the elastic slip displacement, the strength of which reaches 70% of the ultimate shear strength. Furthermore, the modification factor for pryingout failure po was included to accommodate the fluctuations depending on the failure modes.…”

Section: Applicability For the Shear Force-displacement Relationmentioning

confidence: 99%

“…Ultimately, the formulation was accomplished as the best fit for the normalized skeleton curves. Christou et al (2022) defined the breakpoint (s/sel, q/qmax) = (1.0, 0.7) at the elastic limit and (s/( posel), q/qmax) = (2.5, 0.9), (5.0, 1.0), (7.5, 1.0), and (15, 0.9).…”

Section: Applicability For the Shear Force-displacement Relationmentioning

confidence: 99%

“…In a recent study, Christou et al (2022) elucidated effects of concrete fatigue on the cyclic behavior of composite dowels. They pointed out the deficit of investigations of the fatigue performance of composite dowels.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Behavior of Steel-Concrete Composite Dowel by Clothoid-Shaped Shear Connectors under Fully Reversed Cyclic Stress

Suzuki

Hiraga

Kimura

2023

ACT

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Recently, novel types of shear connectors have been investigated enthusiastically in Europe. Among the new connector geometries, clothoid-shaped shear connectors are used practically for bridge engineering. Although various schemes for evaluating mechanical performance can be used, they were established based on the pushout test database. During their time of use, the concrete slab is expected to be subjected to fully reversed cyclic stress during an earthquake. The stress history thereby differs from those of standard pushout tests, resulting in the discrepancy from the evaluation equations. To address this concern through this study, cyclic loading tests were conducted, imposing compressive and tensile stresses cyclically. A comprehensive experiment using 14 specimens with various influential parameters revealed the cyclic behavior and stress transfer mechanism. The results confirmed that the mechanical capacity of a composite dowel with a clothoid-shaped shear connector is dependent on the stress orientation. Furthermore, the applicability of earlier evaluation formulae was clarified based on established knowledge of experimentally obtained data. Because the necessity for reflecting the stress history was demonstrated, this research newly presents a formula for evaluation of the ultimate shear strength and load-displacement relation.

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Section: Applicability Of Evaluation Equations Proposed From Earlier ...mentioning

confidence: 99%

Section: Applicability For the Shear Force-displacement Relationmentioning

confidence: 99%

Section: Applicability For the Shear Force-displacement Relationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cyclic Behavior of Steel-Concrete Composite Dowel by Clothoid-Shaped Shear Connectors under Fully Reversed Cyclic Stress

Suzuki

Hiraga

Kimura

2023

ACT

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“…While high stiffness is required from the connectors to minimize the deflection of composite girders, they must also be ductile in order to allow for force redistribution within the composite joint and thus a plastic design. Composite dowels possess both these properties and are therefore favoured increasingly both in building [1][2][3][4][5][6] and bridge [7][8][9][10][11][12][13][14][15][16] constructions. These innovative shear connectors are cut into the steel web or into the flanges of steel girders and positioned within the concrete slab, as shown in an example in Figure 1a or Figure 1c.…”

Section: Introductionmentioning

confidence: 99%

Combined Shear-Tension Loading of Composite Dowels in Cracked Concrete—Experimental Investigations and Design

et al. 2022

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The importance of slim decks has led engineers to the exploration of high-strength materials and also of innovative shallow shear connectors, such as composite dowels in the case of composite constructions. Minimizing the overall slab depth often leads to composite girders being weakened by means of web openings that are necessary for installations such as ventilation ducts. Depending on the geometrical and loading conditions, some of the shear connectors are subjected to a combination of tensile and shear forces. However, the load-bearing behaviour of these connectors has only been rudimentarily investigated in the case of shear-tensile interaction. In addition, the load-bearing capacity of composite dowels under combined tensile and shear forces has not been investigated in cracked concrete. Earlier investigations under pure shear and pure tensile loading indicate a dependence of the connectors’ load-bearing behaviour on the crack width, so that under combined loading, a similar influence is expected. In this paper, experimental investigations on composite dowels in transversely cracked concrete under systematically varied shear-tension loading combinations are presented. Hereby, predefined crack widths and patterns were considered using a special test rig. Finally, a design approach for concrete failure of composite dowels under shear-tension loading is proposed based on the test results.

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Prefabricated Composite Dowels Girders for Small Bridges‐Structural Design and Efficiency Evaluation

Xiong,

Pan,

Wolters

et al. 2024

ce papers

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A novel prefabricated steel‐concrete composite girder is proposed, which aims to provide an economic and sustainable solution for small bridge construction. The girder consists of composite dowels and concrete slabs. The depth of composite girder is analyzed in a span range of 8‐20m. A continuous deck joint between the simply supported bridge is proposed to enhance the durability of the girder. Carbon emissions from construction materials are compared between different schemes. The efficiency of the schemes is evaluated through Live Load Structural Index.

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The effect of concrete fatigue on the cyclic behaviour of composite dowels - derivation of a design approach based on experimental findings

Cited by 9 publications

References 32 publications

Cyclic Behavior of Steel-Concrete Composite Dowel by Clothoid-Shaped Shear Connectors under Fully Reversed Cyclic Stress

Cyclic Behavior of Steel-Concrete Composite Dowel by Clothoid-Shaped Shear Connectors under Fully Reversed Cyclic Stress

Combined Shear-Tension Loading of Composite Dowels in Cracked Concrete—Experimental Investigations and Design

Prefabricated Composite Dowels Girders for Small Bridges‐Structural Design and Efficiency Evaluation

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