Concrete creep and shrinkage effect in adhesive anchors subjected to sustained loads

Boumakis, Ioannis; Marcon, Marco; Ninčević, Krešimir; Czernuschka, Lisa-Marie; Wan‐Wendner, Roman

doi:10.1016/j.engstruct.2018.07.067

Cited by 21 publications

(12 citation statements)

References 31 publications

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“…All concrete cylindrical specimens used for creep and shrinkage tests had the same geometry and were instrumented in the same way with strain-gauges. More detailed information about creep and shrinkage tests and drawings of the creep frame can be found in [28]. the loading rate effect on strength.…”

Section: Concrete Mechanical Propertiesmentioning

confidence: 99%

Consistent Time-to-Failure Tests and Analyses of Adhesive Anchor Systems

et al. 2020

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Motivated by tunnel accidents in the recent past several investigations into the sustained load behavior of adhesive anchors have been initiated. Nevertheless, the reliable life-time prediction of bonded anchor systems based on a relatively short period of testing still represents an unsolved challenge due to the complex non-liner viscoelastic behaviour of concrete and adhesives alike. This contribution summarizes the results of a comprehensive experimental investigation and systematically carried out time-to-failure analysis performed on bonded anchors under sustained tensile load. Two different adhesive materials that find widespread application in the building industry were used, one epoxy and one vinylester based. Performed experiments include full material characterizations of concrete and the adhesives, bonded anchor pull-out tests at different loading rates, and time-to-failure sustained load tests. All anchor tests are performed in a confined configuration with close support. After a thorough review of available experimental data and analysis methods in the literature the experimental data is presented with the main goals to (i) derive a set of recommendations for efficient time to failure tests, and (ii) to provide guidance for the analysis of load versus time-to-failure test data. Finally, a new approach based on a sigmoid function is proposed and compared to the established regression models. The analyses indicate a better agreement with the physics of the problem and, thus, more reliable extrapolations.

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Section: Concrete Mechanical Propertiesmentioning

confidence: 99%

Consistent Time-to-Failure Tests and Analyses of Adhesive Anchor Systems

et al. 2020

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“…Die Kenntnis dieses Langzeitverhaltens ist von essenzieller Bedeutung für die Bemessung solcher Befestigungen, da ein Überschreiten der kritischen Verschiebungen durch Kriechen zu einem abrupten Versagen der Befestigung während der Nutzungsdauer führen kann. Das Langzeitverschiebungsverhalten von Verbunddübeln ist daher Gegenstand intensiver Forschungen [1–8].…”

Section: Zielsetzungunclassified

Einfluss unterschiedlicher Lastaufbringungsverfahren auf die Verschiebungsprognose von Verbunddübeln

Stierschneider¹,

Zeman²,

Bergmeister³

2020

Beton und Stahlbetonbau

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In diesem Beitrag wird der Einfluss von drei unterschiedlichen Lastaufbringungsarten im Rahmen von Dauerlastversuchen an Verbunddübeln untersucht. Diese unterscheiden sich in der Gleichmäßigkeit der aufgebrachten Dauerlast und ihrer Regelung über die Versuchszeit, sind aber alle für die Durchführung zulässig. Da die aufgebrachte Dauerlast in direktem Zusammenhang mit den gemessenen Verschiebungen steht, welche auf eine Nutzungsdauer von derzeit üblicherweise 50 Jahren extrapoliert werden, soll der Einfluss unterschiedlicher Lastaufbringungsarten auf die Verschiebungsprognose untersucht werden. Da gegenwärtig eine verlängerte Nutzungsdauer immer mehr an Bedeutung gewinnt, sind mögliche Einflüsse im Zuge der Versuchsdurchführung auf die Extrapolation von Relevanz. Die so gewonnenen Erkenntnisse in Bezug auf die Art der Lastaufbringung und deren Einfluss auf die Prognose können unter Umständen für die Erarbeitung von Prüfrichtlinien für eine verlängerte Nutzungsdauer herangezogen werden.

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“…A more detailed description of the experimental apparatus can be found in the study of Boumakis et al. .…”

Section: Time‐dependent Propertiesmentioning

confidence: 99%

“…One of the goals of this CDL is the understanding of the long-term were measured with strain gauges. A more detailed description of the experimental apparatus can be found in the study of Boumakis et al [5]. Figure 5 shows the instrumentation of the specimens to measure the different types of shrinkage; autogenous and drying; and creep, basic, and drying.…”

Section: Creep and Shrinkagementioning

confidence: 99%

Comprehensive data collection for the development of anchorage lifetime prediction models

et al. 2019

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Nowadays, fastening systems represent a very important part of the construction industry due to their versatility and use in reconstruction. Therefore, it is essential to study and understand phenomena and effects influencing the lifetime of a fastening system. However, the mechanisms are complex and not yet fully understood. As a result, numerical models, which are reliable and are able to capture all involved effects, are needed. The basis of these models is a wide range of high quality data, for model development, calibration, and validation purposes. Within the 7‐year Christian Doppler Laboratory (CDL) of Life Cycle Robustness, an extensive concrete data base, consisting of short‐term mechanical properties of concrete, time‐dependent measurements as well as tests on full fastening systems, was generated. The material tests reach from compression, indirect tensile, and fracture tests to long‐term creep and shrinkage tests. Shear and pull‐out tests were carried out on bonded and mechanical anchors. In order to characterize the long‐term performance, sustained load and time to failure tests were conducted at a system level. In total, 12 concrete mixes were tested. This contribution will give an overview of the performed tests and will highlight the importance of sound experimental data.

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Concrete creep and shrinkage effect in adhesive anchors subjected to sustained loads

Cited by 21 publications

References 31 publications

Consistent Time-to-Failure Tests and Analyses of Adhesive Anchor Systems

Consistent Time-to-Failure Tests and Analyses of Adhesive Anchor Systems

Einfluss unterschiedlicher Lastaufbringungsverfahren auf die Verschiebungsprognose von Verbunddübeln

Comprehensive data collection for the development of anchorage lifetime prediction models

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