Untersuchungen zum Risswachstum in Verbunddübelleisten/Crack propagation investigations on composite dowels

Wolters, Kevin; Christou, George; Feldmann, Markus

doi:10.37544/0005-6650-2019-06-50

Cited by 12 publications

(15 citation statements)

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“…In contrast to the small part tests on a dowel, the shear forces transmitted by the composite dowels could not be directly controlled by the cylinder's force. Numerous preliminary investigations were carried out to select the upper and lower loads in the load cycles, which are described in [18]. The small part tests showed a pronounced crack initiation phase despite doweling, which is why the loads were initially selected somewhat higher for the first beam and then reduced from the measurable crack propagation, because the measured crack propagation rates indicated that the crack was growing too fast.…”

Section: Methodsmentioning

confidence: 99%

“…Within the framework of the research project, the crack propagation in composite dowels was initially investigated in small part tests with only one steel tooth [21]. The results of the small part tests were presented in [18]. On the basis of three fatigue tests on largeformat beams, the extent to which the findings of the small parts tests can be transferred to the steel tooth in the composite beam and which additional effects have to be taken into consideration is investigated.…”

Section: Test Set-up and Measurementmentioning

confidence: 99%

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Crack propagation and residual load‐bearing behavior of composite dowels – effects on the global behavior of composite girders under cyclic loading

Wolters¹,

Christou²,

Feldmann³

2021

ce papers

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Fatigue of a composite girder according to Eurocode 4 is carried out on the decisive shear connector. It is not taken into account that the composite girder is an internally highly statically indeterminate system in which the failure of a dowel does not necessarily lead to the failure of the girder. This applies in particular to composite dowels which are characterised by a crack propagation phase with a high residual load‐bearing capacity of a damaged dowel. In own small part and girder tests as well as numerical studies, numerous positive load‐bearing effects could be identified in composite girders with composite dowels, which increase the lifetime of the girder. In case of an initial crack in a steel dowel, followed by crack propagation, the stiffness degradation of the damaged connector leads to a redistribution of forces. The lifetime of a girder is limited by the residual capacity of the composite joint or by a global failure with increasing partial connection. A global safety concept for composite girders taking into account the crack development and residual strength of the dowels as well as the redistribution of forces within the composite joint holds an enormous economic potential. This article shows how these effects can be taken into account.

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Section: Methodsmentioning

confidence: 99%

Section: Test Set-up and Measurementmentioning

confidence: 99%

Crack propagation and residual load‐bearing behavior of composite dowels – effects on the global behavior of composite girders under cyclic loading

Wolters¹,

Christou²,

Feldmann³

2021

ce papers

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“…Von besonderem Interesse sind hierbei die Dehnungsmessstreifen (DMS) auf den Stahlzähnen der Verbunddübelleiste, da diese eine Aussage über das Versagen der Verbundfuge liefern können. Die Position der Messstreifen wurde ausgehend von den Erfahrungen vergangener Untersuchungen [25, 26] so gewählt, dass sie die Hotspot‐Spannungen der Stahlzähne messen können (Bild 8).…”

Section: Numerische Untersuchungenunclassified

Integrale Spundwandwiderlager für modulare Verbundbrücken

2023

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Die alternde Bestandsinfrastruktur von Brückenbauwerken in Deutschland hat zu einem massiven Sanierungs‐ und Erneuerungsbedarf geführt. Im Sinne einer nachhaltigen Ressourcennutzung sind neben den reinen Herstellkosten auch die Lebenszyklus‐ und volkswirtschaftlichen Kosten zu beachten, was in bisherigen Entwurfskonzepten meist nur ungenügend berücksichtigt wird. Modulare Verbundbrücken mit integralen Spundwandwiderlagern bieten in dieser Hinsicht Vorteile. Da hierfür jedoch noch keine standardisierte Bemessungspraxis existiert, werden bisher nur einzelne Bestandteile dieser Bauweise in wenigen Pilotprojekten ausgenutzt. Um an dieser Stelle entgegenzuwirken, werden im Rahmen des FOSTA‐Forschungsprojekts P1521 zwei Konzepte zur Ausführung einer quasimonolithischen Verbindung zwischen Verbundfertigteilträgern und Spundwänden als Gründungselemente entwickelt. Um eine möglichst breite Anwendungspraxis zu erzielen, wird zum einen ein teilmomententragfähiger Anschluss für Spannweiten bis ca. 25 m, zum anderen ein vollmomententragfähiger Anschluss für größere Spannweiten bis ca. 45 m untersucht. Hierfür werden neben experimentellen Untersuchungen des Anschlussdetails in der Rahmenecke umfangreiche numerische Untersuchungen und Parameterstudien durchgeführt, um maßgebliche Einflussparameter auf die Steifigkeit und Tragfähigkeit des Details zu identifizieren. Die Auswertung der Versuche zeigt eine durchaus hohe Tragfähigkeit sowie ein gutmütiges Nachbruchverhalten der Verbindung.

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“…Further investigations regarding rib shear connectors under static and cyclic loading were conducted in [9]. Investigation focusing on the steel fatigue of composite girders are included in [10] and [11]. The former publication included numerical and experimental investigation on rib shear connectors, while the…”

Section: State Of the Artmentioning

confidence: 99%

Concrete fatigue of composite constructions with rib shear connectors

2021

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Rib shear connectors are gaining increasingly attention in the field of composite constructions. Especially in bridge constructions, rib shear connectors offer many advantages compared to conventional composite shear connectors such as headed studs. In order to describe the load‐bearing behaviour of rib shear connectors under cyclic loading, the successively increasing slip resulting from the cyclic loading of the shear connectors must be taken into account. The latter leads to the growth of the relative displacements along the composite joint and thus, to the degradation of the previously rigid shear connection. This effect leads to rearrangements of internal forces between the composite partners through which the load bearing behaviour and load bearing capacity of the structure alter. In this article results of experimental investigations on two cyclic single Push‐Out‐Tests (sPOT) and one full‐scale girder test regarding the degradation of the composite interconnection are presented and analysed. The investigated shear connectors in the full‐scale girder test are subjected to a comparable load history to that of the connectors in the sPOT. The results give insight into the effects of the degradation of the shear connection, as previously seen in sPOT, on the overall load bearing behaviour of composite girders.

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Untersuchungen zum Risswachstum in Verbunddübelleisten/Crack propagation investigations on composite dowels

Cited by 12 publications

References 0 publications

Crack propagation and residual load‐bearing behavior of composite dowels – effects on the global behavior of composite girders under cyclic loading

Crack propagation and residual load‐bearing behavior of composite dowels – effects on the global behavior of composite girders under cyclic loading

Integrale Spundwandwiderlager für modulare Verbundbrücken

Concrete fatigue of composite constructions with rib shear connectors

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