Effect of support condition and load arrangement on the shear response of reinforced concrete beams without transverse reinforcement

Tung, Nguyen Duc; Tue, Nguyen Viet

doi:10.1016/j.engstruct.2015.12.022

Cited by 20 publications

(22 citation statements)

References 4 publications

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“…Most models place the critical section close to the higher moment-to-shear M/Vd ratio. 7,21 However, according to other authors, [22][23][24][25] the critical section is placed closer to the position where the bending moment reaches the cracking moment. Since these models are based on different failure criteria, a comparison of the accuracy provided by these models could point which one better represents the shear failure.…”

Section: Introductionmentioning

confidence: 77%

“…The literature provides the following shear slenderness definitions (λ): (a) a/d ratio, which is geometric relations between the shear span and the effective depth of members, mostly used in codes of practice 12 ; (b) M/Vd ratio, which directly expresses the ratio between the acting internal forces in a section and is equivalent to the a/d ratio for simply supported members, 34 and (c) max(a 1 ;a 2 )/d ratio, which accounts for geometric information on the bending moment diagram and covers both simply supported and continuous members. 32 Tung and Tue 25 observed when M span > M sup in continuous members subjected to uniformly DLs (Figure 5a), the shear strength is approximately equal to that of simply supported members under uniformly DLs (Figure 5b). The authors highlighted if M span < M sup , the shear strength of continuous beams under DLs can be approximated by the sum of two equivalent cantilevers, that is, one loaded by the shear force at the point of inflection and another loaded by a DL (Figure 5c).…”

Section: Degree Of Rotational Restraint and Shear Slendernessmentioning

confidence: 90%

“…27,28 The contribution of different shear transfer mechanisms can vary according to the location, shape, and kinematics of the critical shear crack. Tung and Tue 25 observed some members, such as cantilevers under uniformly DLs, can be favored regarding shear strength by higher bending moments close to the support. Therefore, questions on a possible influence of the structural system and load arrangement on the main shear-carrying mechanisms may be raised.…”

Section: Introductionmentioning

confidence: 99%

“…The critical section in models based on the modified compression field theory (MCFT) 29 and critical shear crack theory (CSCT) 21 is usually close to the section of higher M/Vd, where d is the effective depth. These models predict the shear strength has an inverse relation with longitudinal concrete strain ε in the critical section, which is directly associated with bending moment M. However, according to some experimental results 25,30 the shear strength of members such as cantilever under uniformly DLs may benefit from higher bending moment in the section of maximum M/Vd ratio. Therefore, for such cases, the shear behavior may not be well described without considering the structural system and load arrangement, which can influence the contributions of the main shear-carrying mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…However, in cantilever members under DLs, the higher bending moment close to the support can improve the compression chord capacity in such a way that the total shear strength can be improved instead of reduced. 25…”

Section: Introductionmentioning

confidence: 99%

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One‐way shear strength of wide reinforced concrete members without stirrups

Sousa

Lantsoght

Debs

2020

Structural Concrete

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The calibration of most analytical models that assess the shear strength of wide reinforced concrete members without shear reinforcement is based on simply supported beam tests, which may not be representative of slabs and wide members failing in shear. This paper addresses the knowledge on the shear strength of wide members, identification of their most important parameters, and an evaluation of the accuracy and precision of the main models presented in codes of practice and literature. A database of 170 shear tests was built on wide members loaded over the entire width, with the ratio width to effective depth b/ d > 1. This database includes members under concentrated loads (CLs) and distributed loads (DLs) in the span direction. A parameter analysis revealed such shear strength is mostly influenced by the shear slenderness and size effect rather than by the ratio b/d. Furthermore, the results show a clear decrease in the shear strength of continuous members under DLs to higher shear slenderness, similar to the behavior of members under CLs. This trend was well observed with the proposed model of shear slenderness, which assumes that continuous members with higher bending moment in the span than over the inner support behave closer to simply supported members. A comparison of the shear capacities predicted by the physical-mechanical and semiempirical approaches showed the higher accuracy and precision of models based on the critical shear crack theory and critical shear displacement theory, regardless of the ratio b/d. Therefore, the same models derived based on beam tests are valid for wide members. Apart from that, the analyses of nonslender members with some strain-based models combined with reducing factors of the acting shear load provide accurate results of shear strength for members without stirrups.Abbreviations: AVG, average value; CCCM, compression chord capacity model; COV, coefficient of variation; CSCT, critical shear crack theory; CSDT, critical shear displacement theory; CWSB, critical width of the shear band; MCFT, modified compression field theory; MIN, minimum value; SFSMM, shear-flexural strength mechanical model. Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Introductionmentioning

confidence: 77%

Section: Degree Of Rotational Restraint and Shear Slendernessmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

One‐way shear strength of wide reinforced concrete members without stirrups

Sousa

Lantsoght

Debs

2020

Structural Concrete

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Einfluss geringer Querkraftbewehrung auf die Querkrafttragfähigkeit von Stahlbetonbalken unterschiedlicher M/V‐Kombinationen

Tue

Ehmann

Betschoga

et al. 2018

Beton und Stahlbetonbau

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Es wurden Schubversuche mit Querkraftbewehrungsgraden zwischen dem 0,6‐ und 1,6‐Fachen der Mindestquerkraftbewehrung ρw,min nach EC2 durchgeführt. Insgesamt wurden vier Einfeldbalken unter Einzellast und drei Einfeldträger sowie vier Kragarme unter Gleichstreckenlast getestet. Die Versuchsergebnisse zeigen einen erheblichen Einfluss des statischen Systems und der Belastungsart auf die Traglast und das Rissbild der untersuchten Balken. Während ein Bewehrungsgrad unterhalb der Mindestquerkraftbewehrung kaum Einfluss auf die Querkrafttragfähigkeit von Stahlbetonbalken unter Einzellast hat, führt bereits eine sehr geringe Querkraftbewehrung (≈ 0,6 ρw,min) zu einer erheblichen Steigerung der Querkrafttragfähigkeit bei Balken unter Gleichstreckenlast. Neuartige Messmethoden wie z. B. photogrammetrische Verformungsmessung erweisen sich als geeignetes Werkzeug zur Ermittlung der Änderung des Kraftflusses im Bauteil in Abhängigkeit vom Belastungslevel.

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Biegeschubtragfähigkeit zentrisch vorgespannter Stahlbetonbalken unter Gleichstreckenlast

Betschoga

Sever

Tung

et al. 2022

Beton und Stahlbetonbau

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Es wurde ein experimentelles Programm zur Untersuchung des Einflusses einer zentrischen Vorspannung auf die Querkrafttragfähigkeit von Stahlbetonbalken ohne Querkraftbewehrung durchgeführt. Insgesamt wurden zwölf vorgespannte Einfeldträger und Kragarme unter Gleichstreckenlast getestet. Die Versuchsergebnisse zeigen, dass der Einfluss der Normalkraft bei den Kragarmen mit Gleichstreckenlast, bei denen der kritische Schubriss im Bereich hoher Momentenbeanspruchung auftritt, deutlich geringer als bei Einfeldbalken mit Gleichstreckenlast ist. Der Einfluss der Vorspannung wird somit maßgeblich durch die damit verbundene Änderung des Rissbilds und der Dehnungsebene am Querschnitt mitbestimmt. Ergänzend wurde eine umfassende nichtlineare FE‐Parameterstudie durchgeführt. Durch Kombination der experimentellen und numerischen Untersuchungen kann der Einfluss der Vorspannkraft auf die Querkrafttragfähigkeit bei unterschiedlichen statischen Systemen und Belastungen quantifiziert werden.

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Effect of support condition and load arrangement on the shear response of reinforced concrete beams without transverse reinforcement

Cited by 20 publications

References 4 publications

One‐way shear strength of wide reinforced concrete members without stirrups

One‐way shear strength of wide reinforced concrete members without stirrups

Einfluss geringer Querkraftbewehrung auf die Querkrafttragfähigkeit von Stahlbetonbalken unterschiedlicher M/V‐Kombinationen

Biegeschubtragfähigkeit zentrisch vorgespannter Stahlbetonbalken unter Gleichstreckenlast

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