Neue Untersuchungen zum Ermüdungsverhalten von Kopfbolzendübeln

Hanswille, Gerhard; Porsch, Markus; Üstündag, Cenk

doi:10.1002/stab.200610031

Cited by 16 publications

(14 citation statements)

References 2 publications

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“…The fatigue life of headed studs in push-out specimens is thus affected not only by the load range ΔP but also by the peak load P max and the static resistance P u,0 . To consider these effects, national and international fatigue tests were reanalysed [6], [7] and [8]. In order to avoid results that cannot be readily compared, only tests with test specimens meeting the requirements of Eurocode 4 were taken into account.…”

Section: Determination Of the Lifetimementioning

confidence: 99%

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Studies of the lifetime of cyclically loaded steel-concrete composite bridges

2010

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In current German and international standards for composite structures of steel and concrete, the determination of the ultimate load capacity and the fatigue life of headed shear studs is carried out with separate and independent verifications at the ultimate, serviceability and fatigue limit states. The fatigue resistance is verified in a similar way to steel structures, based on a nominal stresses concept and linear damage accumulation according to Palmgren‐Miner. The effect of pre‐damage due to fatigue loading at both the ultimate and serviceability limit states is not considered. Because cyclic loading of headed shear studs leads to a decrease in the static strength of stud connectors, the assumptions for independent limit states are not given and the reliability index of steel‐concrete composite structures subjected to fatigue loading may fall below the target values in codes. This paper deals with the results of a comprehensive programme of experimental work with more than 90 standard EC4 push‐out test specimens and two full‐scale beam tests which consider the crack propagation through the stud foot and the local damage to the concrete surrounding the studs as relevant consequences of highcycle loading. Based on the results of the push‐out tests, new design methods were developed to predict the fatigue life and the residual strength of headed shear studs after high‐cycle loading. Considering the interaction between the local damage and the behaviour of the global structure, these research results were taken as the basis for simulating the cyclic behaviour of composite beams by means of a damage accumulation method.

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Section: Determination Of the Lifetimementioning

confidence: 99%

“…4, in both series the load range was held constant and the peak load increased as well as decreased within the range of the loading parameters of the constant amplitude tests. More detailed information about the test results is given in [6], [7] and [8].…”

Section: Load Sequence Effectsmentioning

confidence: 99%

Studies of the lifetime of cyclically loaded steel-concrete composite bridges

2010

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“…Von Oehlers [13] und dann auch von Veljkovic und Johannson [14] wurde zur Berücksichtigung einer mit zunehmender Anzahl an Lastspielen geringer werdenden statischen Resttragfähigkeit P res mit einer linearen Reduktion berücksichtigt (Bild 15, blaue Linie A -C). Weiterreichende Untersuchungen von Hanswille, Porsch und Üstündag [15] führten mit zunehmender Lastspielzahl zu einer phasenweisen Reduktion der statischen Resttragfähigkeit (Bild 15, rote Linie A -C). Zurzeit wird in der Norm für Verbundbrücken durch eine Begrenzung der Oberlast unter der charakteristischen Kombination der Einwirkungen die Ausnutzung der Kopfbolzen beschränkt, um diesem Effekt vorzubeugen.…”

Section: Stand Der Technik Und Erweiterungunclassified

Randnahe Kopfbolzen – Ermüdungsverhalten unter Querschub

Raichle¹,

Kuhlman

2016

Stahlbau

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Kopfbolzen, die in neuen interessanten Konstruktionsformen nahe zum freien Bauteilrand des Betons angeordnet werden, zeigen ein anderes, durch frühe Spaltrissbildung bestimmtes Tragverhalten als die üblichen randfernen Kopfbolzen. Der effektive Randabstand hat einen bedeutenden Einfluss auf die Tragfähigkeit. Für die bisher schon in DIN EN 1994‐2, Anhang C gegebenen Bemessungsregeln bei einer randnahen Anordnung mit Beanspruchungsrichtung längs oder quer zum freien Bauteilrand werden Ergänzungen und Verbesserungen erläutert. Insbesondere werden Forschungsergebnisse zum Ermüdungsverhalten unter Querschub vorgestellt, die auch zu einer Bemessungsgleichung für die Ermüdungsfestigkeit von randnahen Kopfbolzen unter Querschub führen. Darüber hinaus wird für diesen Fall der Einfluss einer Ermüdungsbeanspruchung auf die statische Resttragfähigkeit näher betrachtet. Headed studs that cause splitting forces in direction of the slab thickness – Fatigue behaviour under transverse shear – enhancement of existing rules. Headed studs, arranged in interesting innovative composite cross sections near to the slab surface, show a different load carrying behaviour due to splitting forces than studs in standard situations without any edge influence. The effective edge distance has a significant influence on the carrying capacity. For the rules given in EN 1994‐2, Annex C for the case of headed studs close to the concrete surface with load direction either in longitudinal or transverse direction, enhancements and improvements are explained in detail. Especially research results on the fatigue behaviour of headed studs close to the concrete surface under transverse shear are introduced und a design equation for the fatigue resistance is provided. Furthermore the influence of a fatigue loading on the residual static resistance of headed stud arranged close to the concrete surface is discussed.

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“…

In modern bridge construction, steel-concrete composite structures with composite dowels are being built more than ever, especially for small and medium spans. In contrast to headed studs, in which initial steel cracks occur after only a few load cycles [1], [2], the lifetime of composite dowels is characterized by the compression of the multi-axially stressed concrete in front of the composite dowel. Here, plastic compression strains occur in the concrete and accumulate over load cycles, leading to a cyclic increase in relative displacements in the connection.

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Concrete fatigue in composite dowels

Claßen

Gallwoszus

2016

Structural Concrete

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In modern bridge construction, steel‐concrete composite structures with composite dowels are being built more than ever, especially for small and medium spans. In contrast to headed studs, in which initial steel cracks occur after only a few load cycles [1], [2], the lifetime of composite dowels is characterized by the compression of the multi‐axially stressed concrete in front of the composite dowel. Here, plastic compression strains occur in the concrete and accumulate over load cycles, leading to a cyclic increase in relative displacements in the connection. Certain proportions of these relative displacements, called inelastic slip, remain in the connection, even after the loading is relieved. The inelastic slip changes the characteristics of the static dowel curve. The initially rigid connection degrades over its lifetime, leading to redistributions of internal forces, which may be critical for fatigue design. In order to consider the degradation of the composite connection, a cyclic dowel curve can be used, which may be developed from the static dowel curve by introducing the inelastic slip. This paper presents the results of cyclic shear tests on different composite dowel geometries. The effect of load‐dependent parameters (upper load level and load range) was investigated. Furthermore, an engineering model for determining the cyclic dowel curve is presented, which was developed based on the results of experimental and numerical investigations.

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Neue Untersuchungen zum Ermüdungsverhalten von Kopfbolzendübeln

Cited by 16 publications

References 2 publications

Studies of the lifetime of cyclically loaded steel-concrete composite bridges

Studies of the lifetime of cyclically loaded steel-concrete composite bridges

Randnahe Kopfbolzen – Ermüdungsverhalten unter Querschub

Concrete fatigue in composite dowels

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