Zum Riss‐ und Verformungsverhalten von Stahlverbundträgern mit Ganzfertigteilen

Mager, Matthias; Geißler, Karsten

doi:10.1002/stab.201900064

Cited by 3 publications

(7 citation statements)

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“…Zu beachten ist in jedem Fall der zusätzliche Einfluss des Schwindens. Über die Berechnungsansätze für Ganzfertigteilträger wird in einem separaten Aufsatz berichtet .…”

Section: Rissbreitenberechnung An Verbundträgernunclassified

Zum Riss‐ und Verformungsverhalten von Stahlverbundträgern mit Teilfertigteilen

Mager

Geißler

2020

Stahlbau

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Crack and deformation behaviour of composite beams using partial-depth precast concrete units The structural behaviour of statically indeterminate composite beams under service conditions is basically influenced by crack formation in ranges with negative moments. Composite beams with partial-depth precast concrete units show some particularities, which cannot be described accurately using the established methods of calculation. This article presents methods of calculation, which can be used to cover the specific structural behavior and describe crack formation, crack widths and deformations realistically. Bild 20 Schwindmodell -a) K-Bereich, b) F-Bereich Model for shrinkage -a) K-range, b) F-range Bild 21 Prinzipieller Zeitverlauf der Schwindfälle FT*, FT und OB Time functions in principle for shrinkage types FT*, FT and OB Bild 22 Schwindbehinderungsbeiwert b t,e Coefficient of disabled shrinkage b t,e

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“…Zu beachten ist in jedem Fall der zusätzliche Einfluss des Schwindens. Über die Berechnungsansätze für Ganzfertigteilträger wird in einem separaten Aufsatz berichtet .…”

Section: Rissbreitenberechnung An Verbundträgernunclassified

Zum Riss‐ und Verformungsverhalten von Stahlverbundträgern mit Teilfertigteilen

Mager

Geißler

2020

Stahlbau

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“…Composite beams subjected to bending loads can be analyzed by transferring the general correlations known from reinforced concrete construction to describe the crack formation. In this method, the concrete chord is considered as an eccentrically loaded tension member 1–3 …”

Section: Crack Width Calculation For Composite Beamsmentioning

confidence: 99%

“…The following sections describe the approaches to calculate partial‐depth precast concrete beams. The detailed deduction is given in Reference 3. The geometry of the precast units produces local states of stresses which must be superimposed upon the overall stresses.…”

Section: Crack Width Calculation For Composite Beamsmentioning

confidence: 99%

“…In this context, it is vital to consider the additional influence of shrinkage. A separate article reports on the approaches to calculate fully precast beams 6 …”

Section: Crack Width Calculation For Composite Beamsmentioning

confidence: 99%

“…Explaining the complex correlations between crack states, average component behavior and steel stresses goes beyond the scope of this article. Please refer to Reference 3 for these and other aspects of shrinkage in partial‐depth precast concrete units.…”

Section: Residual Stressesmentioning

confidence: 99%

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Crack and deformation behavior of composite beams using partial‐depth precast concrete units

Mager

Geißler

2020

Civil Engineering Design

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In ranges with negative moments, crack formation influences the structural behavior of statically indeterminate composite beams under service conditions. Composite beams with partial-depth precast concrete units show some particularities, which cannot be described accurately using the established methods of calculation. This article presents methods of calculation, which can be used to cover the specific structural behavior and describe crack formation, crack widths and deformations realistically. K E Y W O R D S bridge engineering, composite beams, composite constructions, crack widths, partial-depth precast concrete units 1 | INTRODUCTION Employing precast reinforced concrete components in composite beams helps to take advantage of the benefits of prefabrication in composite construction. The construction time can be reduced, whilst quality and material properties can be enhanced, due to the production in the factory, the splitting of construction processes and the elimination of formwork. These measures cut construction costs. The fields of application are both in building construction and bridge engineering. Over several decades, structural engineers have gathered experiences with the use of precast concrete units in composite beams. Various construction methods have been developed, which can be classified according to the type and the timing of the composite, but above all according to the type of precast units. The most established constructions are • composite beams with partial-depth precast concrete units (TFT), in which the compound between the partial-depth precast concrete units and the steel beam is produced subsequently by adding in-situ concrete as top concrete, • composite precast beams, in which the slab is partially covered with concrete in the factory resulting in an instant compound, and • composite beams consisting of full-depth precast concrete units (GFT), in which the fully precast unit and the steel beam are bonded by in-situ concrete in the relatively wide longitudinal joints. Continuous systems and frameworks show tensile stress in the chord of the composite beam, usually resulting in crack formation.Within the scope of the design, this issue is to be addressed directly by means of structural analysis of the limit values for crack widths as well as indirectly through numerical simulation of deformations and sectional forces. In the case of conventional composite beams comprising pure in-situ concrete slabs, the concrete behavior under tensile load has been sufficiently documented for decades and can easily be mapped. The crack behavior of precast composite beams differs in key aspects from conventional composite beams, mainly because of the transverse joints. Therefore, the crack behavior cannot be accurately described using standard calculation models. Hence, it is currently impossible to decide whether the simplified calculation method can be applied to these components.

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