scholarly journals Shear Response of Members without Shear Reinforcement—Experiments and Analysis Using Shear Crack Propagation Theory (SCPT)

2021 ◽  
Vol 11 (7) ◽  
pp. 3078
Author(s):  
Maximilian Schmidt ◽  
Philipp Schmidt ◽  
Sebastian Wanka ◽  
Martin Classen
Keyword(s):  
Crack Propagation ◽  
Shear Crack ◽  
Shear Capacity ◽  
Experimental Investigations ◽  
Shear Reinforcement ◽  
Propagation Theory ◽  
Ongoing Research ◽  
Shear Transfer ◽  
Loading Process ◽  
Concrete Members

The determination of the ultimate shear capacity and the identification of the corresponding load-carrying mechanisms of concrete members without shear reinforcement has been an ongoing research topic for over 100 years. Based on a full mechanical model, the Shear Crack Propagation Theory (SCPT) enables to analyze and understand the ever-changing interplay of crack propagation, evolution of stresses at the crack tip and in uncracked concrete parts, as well as the activation of shear transfer actions within the growing shear crack during the entire loading process. In this paper, selected experimental investigations for further validation of the SCPT are presented. These beam shear test results are then compared to the theoretical results emerging from the SCPT algorithm. Finally, the evolution of different shear transfer actions (e.g., aggregate interlock and dowel action) during the entire loading process is evaluated and discussed.

scholarly journals The influence of longitudinal reinforcement on shear capacity of reinforced concrete members without shear reinforcement

2014 ◽  
Vol 13 (3) ◽  
pp. 151-158
Author(s):  
Marta Słowik
Keyword(s):  
Reinforced Concrete ◽  
Shear Capacity ◽  
Longitudinal Reinforcement ◽  
Test Results ◽  
Shear Reinforcement ◽  
Professional Literature ◽  
Model Code ◽  
Concrete Members ◽  
Eurocode 2 ◽  
Model Code 2010

In the paper, the influence of longitudinal reinforcement on shear capacity of reinforced concrete members without shear reinforcement is discussed. The problem is analyzed on the basis of the author’s own test results and tests results reported in the professional literature. It has been concluded that longitudinal reinforcement has an effect on shear capacity especially in members of shear span-to-depth ratio a/d < 2,5. The test results have also been used to verify standard methods of calculating the shear capacity in reinforced concrete members without shear reinforcement given in Eurocode 2, ACI Standard 318 and Model Code 2010.

scholarly journals Influence of coarse aggregate on the shear strength of reinforced concrete beams

2020 ◽  
Author(s):  
◽  
Hoosen Ahmed Jajbhay
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Coarse Aggregate ◽  
Concrete Beams ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Shear Reinforcement ◽  
Shear Transfer ◽  
Coarse Aggregates

Research to accurately predict the shear capacity of reinforced concrete beams without shear reinforcement has been ongoing since the early 20th century. Aggregate interlock of the coarse aggregates at the shear crack interface is one of the internal mechanisms of shear transfer and a major contributor to the shear capacity of slender beams. It is plausible, therefore, to investigate if the coarse aggregate itself influences the shear capacity of a concrete beam. The influence of the type of coarse aggregate on the shear capacity of beams without shear reinforcement was investigated in this study. From the literature study an understanding of the properties of coarse aggregates was gained, the internal mechanisms of shear transfer in reinforced concrete beams without shear reinforcement were determined, and the parameters influencing shear strength were identified. Based on this information an experimental program was designed. Eighteen reinforced concrete beams without shear reinforcement were cast. The beams were cast from three different types of coarse aggregates commonly used in the Durban area, i.e., dolerite, quartzite and tillite. For each type of coarse aggregate two variations were tested, i.e., 13 mm and 19 mm maximum aggregate sizes. For each size of coarse aggregate, three concrete strengths were tested. The beams were loaded in a beam press, by applying an increasing point load offset from midspan to induce cracking on the shorter side, until shear failure of the beam occurred. For the three concrete strengths, beams cast from dolerite had the highest shear capacity while beams cast from tillite had less shear capacity than beams cast from quartzite coarse aggregate. Furthermore, beams cast from 13 mm maximum size coarse aggregate had higher shear capacity than beams cast from 19 mm aggregate. The conclusion may be drawn that the type and size of coarse aggregate does influence the shear strength of a reinforced concrete beam without shear reinforcement.

Experimentelle Untersuchungen zum Einfluss der Bauteilbreite und der Schubschlankheit auf die Querkrafttragfähigkeit von Stahlbetonplatten ohne Querkraftbewehrung/Experimental Investigations on the Influence of the Slab Width and the Moment-Shear-Ratio on the Shear Capacity of RC Slabs without Shear Reinforcement

Bauingenieur ◽  
2018 ◽  
Vol 93 (01) ◽  
pp. 37-45 ◽  
Author(s):  
V. Adam ◽  
M. Herbrand ◽  
M. Classen
Keyword(s):  
Shear Capacity ◽  
Experimental Investigations ◽  
Shear Reinforcement ◽  
Slab Width ◽  
Experimentelle Untersuchungen ◽  
The Moment ◽  
Rc Slabs

Trotz jahrzehntelanger Forschung ist die Frage nach dem Querkrafttragverhalten von Stahlbetonbauteilen bis heute nicht abschließend geklärt. Nach aktueller normativer Regelung wird bei der Bemessung grundsätzlich zwischen Nachweisen für Bauteile mit und ohne Querkraftbewehrung unterschieden. Während balkenförmige Bauteile stets eine Mindestquerkraftbewehrung aufweisen müssen, dürfen Stahlbetonplatten ohne Querkraftbewehrung ausgeführt werden. Der semi-empirische Querkraftbemessungsansatz nach EC 2 für Bauteile ohne Querkraftbewehrung wurde jedoch an einer Datenbank mit balkenförmigen Versuchskörpern hergeleitet, die überwiegend als gelenkig gelagerte Einfeldträger getestet wurden. Ein möglicherweise tragfähigkeitssteigernder Einfluss infolge einer großen Bauteilbreite wird dementsprechend nicht berücksichtigt. Weitere Einflüsse, beispielsweise infolge statischer Systeme, die vom gelenkig gelagerten Einfeldträger abweichen, werden bei der Bemessung ebenfalls nicht berücksichtigt. Anhand von Querkraftversuchen an Stahlbetonplatten, die über ihre gesamte Versuchskörperbreite belastet wurden und Referenzversuchen an schmalen Plattenstreifen, soll der Einfluss einer Plattentragwirkung auf die Querkrafttragfähigkeit untersucht werden. Durch variierende statische Systeme und Momenten-Querkraftverhältnisse (Schubschlankheiten) wird im Rahmen der Versuche sukzessive die Lage des Momentennulldurchgangs verändert, um verschiedene Lastabstände zum Innenauflager durchlaufender Systeme zu untersuchen. Dadurch soll der tragfähigkeitssteigernde Einfluss kleiner Schubschlankheiten quantifiziert werden.

scholarly journals The Influence of Concrete Strength on Shear Capacity of Reinforced Concrete Members without Shear Reinforcement

2013 ◽  
Vol 12 (1) ◽  
pp. 151-158
Author(s):  
Marta Słowik
Keyword(s):  
Reinforced Concrete ◽  
Concrete Strength ◽  
Shear Capacity ◽  
Shear Reinforcement ◽  
Professional Literature ◽  
Standard Methods ◽  
Model Code ◽  
Concrete Members ◽  
Eurocode 2 ◽  
Model Code 2010

In the paper, dimensioning rules for shear capacity in reinforced concrete members without shear reinforcement given in Eurocode 2, ACI Standard 318 and Model Code 2010 are described. The fib Model Code recommendations are described in more detailed way as they are based on a new concept. The shear strength calculated on the basis of the mentioned codes is later compared to the results of test from professional literature in order to verify standard methods and to analyze the influence of concrete strength on shear capacity in beams without stirrups.

Influence of Spatial Variability on the Shear Capacity of RC Members without Shear Reinforcement

2013 ◽  
Vol 99 (7) ◽  
pp. 1679-1686
Author(s):  
Yuguang Yang ◽  
Joop Den Uijl ◽  
Joost Walraven ◽  
Stavros Petrocheilos
Keyword(s):  
Spatial Variability ◽  
Shear Capacity ◽  
Shear Reinforcement

Research on Shear Bearing Capacity of Reinforced Concrete Short Beam in Salt-Fog Environment

2012 ◽  
Vol 455-456 ◽  
pp. 1079-1083
Author(s):  
Wei Jun Yang ◽  
Hong Jia Huang ◽  
Wen Yu Jiang ◽  
Yi Bin Peng
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Salt Spray ◽  
Test Chamber ◽  
Shear Capacity ◽  
Salt Spray Test ◽  
Concrete Members ◽  
Short Beam ◽  
Shear Bearing Capacity ◽  
Salt Fog

Shantou atmospheric salt-fog environment is simulated with the comprehensive salt spray test chamber. By using reinforced concrete short beams under different water-cement radio, different corrosion time, the inclined section degradation rules of the corrosive reinforced concrete members are researched for establishing shear capacity of short beam formulas in salt-fog environment.

Shear Assessment of Concrete Bridge Deck Slabs

2017 ◽  
Vol 738 ◽  
pp. 110-119 ◽  
Author(s):  
Radoslav Vida ◽  
Jaroslav Halvonik
Keyword(s):  
Current Model ◽  
Shear Capacity ◽  
Concrete Bridge ◽  
Current Standard ◽  
Concrete Members ◽  
Deck Slabs ◽  
Bridge Structures ◽  
Bridge Deck Slabs ◽  
Concrete Bridge Deck ◽  
New Generation

The transitions from old STN standards to Eurocode standards brought several problems into bridge design and assessment. Shear reinforcement is now often required even in concrete members, which were previously allowed to be built without it. Moreover, assessment of existing reinforced concrete bridge structures often shows their insufficiency in shear capacity, which means that they should be strengthened or replaced. Work on new generation of Eurocodes is currently in progress and current model for shear assessment should be replaced by a new (and more precise) one. This paper deals with the problem of shear assessment of concrete bridge according to current standard and also according to the new shear models that are under consideration.

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