Experimental investigation and mechanical modelling of shear failure in reinforced concrete members with plain and ribbed bent-up bars

Huber, Tobias; Untermarzoner, Franz; Kollegger, Johann

doi:10.1016/j.engstruct.2023.115793

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…From these measurements on the surface of RC beams, estimates of the shear force carried by each of these potential shear-transfer actions can be performed. [5][6][7][8][9][10][11][12][13][14] In recent years, several more refined mechanical models have been proposed for estimating the shear capacity of RC beams that consider the contribution from each of the potential shear-transfer actions based on an assumed shape and kinematics of the critical shear crack. 10,[15][16][17][18][19] This includes models that cover the transition from members without to members with small amounts of shear reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Mechanical modeling of dowel action and the influence of small amounts of shear reinforcement on the shear‐transfer actions in RC beams

Autrup

Jørgensen

Ruiz

et al. 2023

Structural Concrete

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Dowel action of the longitudinal reinforcement in RC beams without and with small amounts of shear reinforcement is typically considered a constant shear contribution determined from the splitting strength of the concrete cover. However, in a recent experimental investigation by the authors, it was shown that the shear force transferred by dowel action for beams without shear reinforcement should be determined from the dowel displacement and a linear elastic model and a rigid plastic dowel model. This article is aimed at extending this model to also cover members with small amounts of shear reinforcement. To that aim, a novel approach to calculate the shear force carried by dowel action of the longitudinal reinforcement in both beams with and without shear reinforcement is presented. The model is derived by establishing an equilibrium of work between the internal stored elastic or dissipated plastic energy and the external work performed by the shear force in the dowel. Additionally, a method to determine the displacement of the dowel from DIC measurements is presented. For the remaining shear‐transfer actions, reasonable constitutive models from the literature are adapted. On the basis of DIC measurements, the shear force carried by each of the shear‐transfer actions is calculated for 16 shear tests of beams without and with small amounts of shear reinforcement. The sum of shear force carried by each of the shear‐transfer actions is shown to predict the applied shear force fairly well, from the development of the critical shear crack until failure. Additionally, it is shown that for beams with shear reinforcement below the minimum requirements according to the current design standards, the shear capacity is governed by aggregate interlock, residual tensile stresses, and the inclination of the compression chord. While for beams with shear reinforcement above the minimum requirements, the shear capacity is governed by the shear reinforcement and dowel action.

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Section: Introductionmentioning

confidence: 99%

Mechanical modeling of dowel action and the influence of small amounts of shear reinforcement on the shear‐transfer actions in RC beams

Autrup

Jørgensen

Ruiz

et al. 2023

Structural Concrete

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Zur Querkrafttragfähigkeit von dünnwandigen Hohlkästen mit unbewehrten Fugen in den Stegen

Rath,

Untermarzoner,

Huber

et al. 2024

Beton und Stahlbetonbau

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Im Zuge des an der TU Wien in Entwicklung befindlichen LT‐Brückenbauverfahrens (L: Longitudinal, T: Transversal) werden dünnwandige Hohlkästen aus Beton als Längsträger (L) mit Fahrbahnplattenelementen (T) und Ortbeton kombiniert. Aufgrund des Bauablaufs verbleiben unbewehrte Fugen in den Stegen dieser Hohlkästen, während die Boden‐ und Deckplatten aufgrund der Ortbetonschichten durchlaufend bewehrt werden können. Es stellt sich die Frage, wie sich diese Fugenkonstellation auf die Quertragfähigkeit der Hohlkastenträger auswirkt. Um ein grundsätzliches Verständnis zu erlangen, wurden zwei großformatige Versuchskörper, einer mit Fugen in den Stegen und einer ohne, experimentell untersucht. Die Querkrafttragfähigkeit des Trägers mit Fugen entsprach in etwa jener des Trägers ohne Fugen, wodurch es demnach trotz der Fugen möglich war, nennenswerte Querkräfte zu übertragen. Als maßgebend für das Querkrafttragverhalten stellte sich die Fugenöffnung dar, da die an die Fuge angrenzenden Bügel wie eine Aufhängebewehrung agieren. So empfiehlt sich eine lokale Erhöhung der Bügelbewehrung in diesem Bereich. Um die Auswirkungen der Vorspannung, wie im LT‐Verfahren vorgesehen, auf das Tragverhalten zu analysieren, wurden nichtlineare Finite‐Elemente‐Untersuchungen durchgeführt. Es konnte gezeigt werden, dass das Tragverhalten des vorgespannten Trägers mit Fugen jenem des Trägers ohne Fugen weitestgehend entspricht.

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Shear resistance of prestressed HPFRC beams without stirrups: A mechanical analysis of shear-transfer actions based on detailed experimental measurements

Ruiz,

Fernández Ruiz,

Todisco

et al. 2024

Engineering Structures

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Experimental investigation and mechanical modelling of shear failure in reinforced concrete members with plain and ribbed bent-up bars

Cited by 4 publications

References 20 publications

Mechanical modeling of dowel action and the influence of small amounts of shear reinforcement on the shear‐transfer actions in RC beams

Mechanical modeling of dowel action and the influence of small amounts of shear reinforcement on the shear‐transfer actions in RC beams

Zur Querkrafttragfähigkeit von dünnwandigen Hohlkästen mit unbewehrten Fugen in den Stegen

Shear resistance of prestressed HPFRC beams without stirrups: A mechanical analysis of shear-transfer actions based on detailed experimental measurements

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