Fugenlose Betonbrücken mit flexiblen Widerlagern

Pötzl, Michael; Naumann, Frank

doi:10.1002/best.200590184

Cited by 15 publications

(8 citation statements)

References 6 publications

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“…In order to mitigate the aforementioned design issues, England [27] has patented a displacement compensation unit for integral bridges, Horvath [28] has introduced the use of expanded polystyrene and mechanically stabilised backfills to rectify the ratcheting effects, and Hoppe [29] introduced the use of elasticised expanded polystyrene to alleviate interaction effects. Potzl et al [30] tested fullheight abutments with expanded polystyrene layers interjected between the abutment and the soil. However, it was found that the polystyrene exhibits permanent deformations and creeps [31]; therefore, gaps are being created between the abutment and the backfill, which allow the soil to flow.…”

Section: Introductionmentioning

confidence: 99%

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Extending the application of integral frame abutment bridges in earthquake‐prone areas by using novel isolators of recycled materials

Mitoulis

Palaiochorinou

Georgiadis

et al. 2016

Earthq Engng Struct Dyn

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Integral Abutment Bridges (IABs) are jointless structures without bearings or expansion joints, which require minimum or zero maintenance. The barrier to the application of longspan IABs is the interaction of the abutment with the backfill soil during the thermal expansion and contraction of the bridge deck, i.e. serviceability, or when the bridge is subjected to dynamic loads, such as earthquakes. The interaction of the bridge with the backfill leads to settlements and ratcheting of the soil behind the abutment and, as a result, the soil pressures acting on the abutment build-up in the long-term. This paper provides a solution for the aforementioned challenges, by introducing a novel isolator that is a compressible inclusion (CI) of reused tyre derived aggregates (TDA) placed between the bridge abutment and the backfill. The compressibility of typical tyre derived aggregates was measured by laboratory tests and the compressible inclusion was designed accordingly. The CI was then applied to a typical integral frame abutment model, which was subjected to static and dynamic loads representing in-service and seismic loads correspondingly. The response of both the conventional and the isolated abutment was assessed based on the settlements of the backfill, the soil pressures and the actions of the abutment. The study of the isolated abutment showed that the achieved decoupling of the abutment from the backfill soil results in significant reductions of the settlements of the backfill and of the pressures acting on the abutment. Hence, the proposed research can be of use for extending the length limits of integral frame bridges subjected to earthquake excitations.

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Section: Introductionmentioning

confidence: 99%

“…Potzl et al [30] tested full-height abutments with expanded polystyrene layers interjected between the abutment and the soil. However, it was found that the polystyrene exhibits permanent deformations and creeps [31], therefore gaps are being created between the abutment and the backfill, which allow the soil to flow.…”

Section: Introductionmentioning

confidence: 99%

Extending the application of integral frame abutment bridges in earthquake‐prone areas by using novel isolators of recycled materials

Mitoulis

Palaiochorinou

Georgiadis

et al. 2016

Earthq Engng Struct Dyn

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“…B. [11,12]). Die Intention dieser Maßnahmen ist es einerseits, den Pfahlkopfbereich weicher zu gestalten, und andererseits, den mobilisierten Erddruck hinter der Widerlagerwand zu reduzieren.…”

Section: Einfluss Von Weicheinlagen 341 Allgemeinesunclassified

Wesentliche Aspekte bei der Planung integraler Brücken

Pietra¹,

Oberwalder²,

Tue

2019

Beton und Stahlbetonbau

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Da es sich bei Integralbrücken um Rahmentragwerke handelt, sind bei der Bemessung einige Besonderheiten zu beachten. Ein wesentlicher Aspekt ist die Beanspruchung infolge Temperatur‐ und Erddrucklasten sowie deren Interaktion in Abhängigkeit von der Tragwerks‐ und der Gründungssteifigkeit, welche in diesem Beitrag untersucht wird. Aufbauend auf diesen Erkenntnissen wird die Auswirkung von Weicheinlagen hinter der Widerlagerwand bzw. im Pfahlkopfbereich im Fall von Tiefgründungen auf die Beanspruchung im Tragwerk beurteilt. Als letzter Punkt wird der Übergang zwischen Brückentragwerk und Straße betrachtet und dessen besondere Anforderungen im integralen Brückenbau aufgezeigt.

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“…14 In the latter case, the aim is to minimize its in-service loading. Potzl et al 15 have also employed the use of EPS in full height abutments. It ap pears that the in-service bridge-abutment-backfill interaction has attracted most of the current research.…”

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confidence: 98%

Two New Earthquake Resistant Integral Abutments for Medium to Long Span Bridges

Mitoulis

Tegos

2011

Structural Engineering International

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A wide field of study is open to new abutment configurations and design innovation as no unified procedure is available for the design and construction of integral abutment bridges (IABs). In this framework, an extended state-of the-art review on the configuration of IABs, with emphasis on the European Bridge Engineering, was done and two new integral abutments were studied. The primary feature of both integral abutments is the de coupling of the in-service response of the bridge from the backfill soil and the utilization of the backfill's resistance during earthquake, aiming at reducing the seismic demand on bridges. This objective was achieved by accommodating the in-service constraint movements of the deck through the flexibility of the IAB and via as small as possible clearances. During an earthquake the IABs interact with the backfill soil and reduce the displacements of the deck and thereby the seismic demand on bridge piers and foundations. Abutments will be useful in future design of intermediate to long-span bridges.

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Fugenlose Betonbrücken mit flexiblen Widerlagern

Cited by 15 publications

References 6 publications

Extending the application of integral frame abutment bridges in earthquake‐prone areas by using novel isolators of recycled materials

Extending the application of integral frame abutment bridges in earthquake‐prone areas by using novel isolators of recycled materials

Wesentliche Aspekte bei der Planung integraler Brücken

Two New Earthquake Resistant Integral Abutments for Medium to Long Span Bridges

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