Behavior of RC interfaces subjected to shear: State-of-the art review

Palieraki, Vasiliki; Vintzileou, Elizabeth; Silva, J.F.

doi:10.1016/j.conbuildmat.2021.124855

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…The bonded length of those bars was varying from a few times the bars diameter to full development length. An evaluation of those results, along with the assessment of equations developed to predict the maximum resistance of those interfaces, is presented in the studies by Palieraki et al 6,7 In parallel, interface reinforcement other than cast‐in or postinstalled reinforcing bars was used in a number of experimental campaigns. A variety of alternative connectors were tested, including powder‐driven shear connectors, 8,9 steel threaded rods, 10 prestressing rods, 11 GFRP bars in various forms, 12 headed studs, 13 and concrete screws 14 .…”

Section: Literature Surveymentioning

confidence: 99%

Experimental cyclic behavior of concrete interfaces with postinstalled reinforcing bars or alternative connectors

Palieraki

Oikonomopoulou

Genesio

et al. 2023

Structural Concrete

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In this experimental campaign, concrete‐to‐concrete interfaces were examined under cyclic actions, crossed by postinstalled reinforcing bars or industrial steel screws. In addition, the effect of the embedment length and the roughness was investigated. It was observed that different failure modes occur, depending on the different connector types and embedment depths. The positive effect of roughness on the interface resistance was confirmed, but the results indicate that, for very high roughness values, the resistance may be smaller than for moderate values. It was also noticed that the behavior of interfaces crossed by mechanical anchors was less stiff in the ascending branch and exhibited a less steep falling branch. The extension of the project on testing thin overlays showed that the resistance was significantly affected in case of cyclic loading, suggesting that the use of any type of anchor in seismic conditions needs to be supported by adequate experimental evidence.

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Section: Literature Surveymentioning

confidence: 99%

Experimental cyclic behavior of concrete interfaces with postinstalled reinforcing bars or alternative connectors

Palieraki

Oikonomopoulou

Genesio

et al. 2023

Structural Concrete

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“…Available experimental results published in fifty-eight (58) papers were collected and compiled in a comprehensive database. A review of this database is presented elsewhere [1]. However, with the emphasis of this work being on the influence of external compressive stress on interfaces between concretes cast at different times and subjected to cyclic shear slip, a brief overview of the published experimental results investigating this parameter is initially provided herein.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Compressive Interface Stress on Interfaces in Reinforced Concrete Elements under Cyclic Action

Palieraki,

Zeris,

Vintzileou

2024

Applied Sciences

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Reinforced concrete interfaces, either cracks within monolithic elements or joints between concretes cast at different times may become critical under cyclic actions, due to stiffness and interface resistance degradation. Among the numerous parameters affecting the behavior of interfaces, this paper focuses on the effect of externally applied compressive stress. In conjunction with this parameter, the diameter of the reinforcing bars crossing the interface, their embedment length, and the anchorage of the interface reinforcement, by bond or using epoxy resin, are investigated. Roughened concrete interfaces crossed by reinforcing bars were subjected to cyclic shear slips, with or without compressive stress normal to the interface. The presented experimental results prove the beneficial effect of the external compressive stress on the ultimate shear resistance of interfaces, accompanied by the reduction of the effect of small embedment length of the interface reinforcement, due to its reduced contribution: the externally imposed compression leads to smaller crack openings at the interface, in most cases smaller than 0.40 mm, and to reduction of the reinforcement clamping effect. The shear resistance is activated at reduced shear slip values (0.20 mm–0.40 mm compared to 0.20–0.80 mm for interfaces under zero external compression), while the interface resistance degradation is also reduced (e.g., during the second load cycle, to 15% on average, compared to 30% for interfaces under zero external compression). Finally, an equation previously proposed by the authors is applied for the prediction of the shear resistance of interfaces under normal force, leading to satisfying accuracy.

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“…Generally speaking, the shear capacity of post-pouring-grouting multi-key assembly connection is better than that of parallel assembly connection. [14][15][16] Shear capacity of precast RC shear walls with various assembly connections has been investigated. 7,11,17,18 Soudki et al 7 conducted pseudo-static tests of assembly RC shear walls with welded longitudinal rebars in the assembly connection region.…”

Section: Introductionmentioning

confidence: 99%

“…The configuration of assembly connection can be divided into parallel assembly connection and post‐pouring‐grout multi‐key assembly connection. Generally speaking, the shear capacity of post‐pouring‐grouting multi‐key assembly connection is better than that of parallel assembly connection 14–16 …”

Section: Introductionmentioning

confidence: 99%

Experimental research and theoretical analysis of novel polygon‐key assembly connections

Wang

2023

Structural Concrete

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To improve the shear performance of assembly connections in precast RC shear wall structures, a novel polygon‐key assembly connection (PKA connection) was proposed. Shear tests were carried out to study the shear performance of the PKA connections, specimens' parameters considered in the tests consist of polygon‐key inclination angles, polygon‐key heights, and axial compression ratios. Shear capacity, stiffness, and failure modes of the PKA connections were investigated. Furthermore, theoretical analysis of the PKA connection was performed, equations of PKA connection's shear capacity were deduced, and the theoretical analysis results were verified by the test results. The results show that the polygon‐keys can effectively improve the shear capacity of assembly connection of precast RC shear wall structure. Compared with the parallel assembly connection, peak shear capacity of the PKA connection can be enhanced by more than 15%. When polygon‐key's inclination angle is within the range of 45–90°, the peak loads of PKA connections change slightly. When polygon‐key's height is within the range of 5–7 cm, the cracking load and peak load of the PKA connection change slightly. With an increase in axial compression ratio, the shear capacity of PKA connection gradually increases, and the peak displacement changes slightly. Based on the shear‐friction theory, the calculated PKA connection's peak loads are in good agreement with the test results.

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Behavior of RC interfaces subjected to shear: State-of-the art review

Cited by 15 publications

References 29 publications

Experimental cyclic behavior of concrete interfaces with postinstalled reinforcing bars or alternative connectors

Experimental cyclic behavior of concrete interfaces with postinstalled reinforcing bars or alternative connectors

Experimental Investigation of the Effect of Compressive Interface Stress on Interfaces in Reinforced Concrete Elements under Cyclic Action

Experimental research and theoretical analysis of novel polygon‐key assembly connections

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