Similaridades entre resistência à punção em lajes-cogumelo e ao cisalhamento em vigas de concreto armado com fibras de aço

Hanai, João Bento de; Holanda, Kristiane Mattar Accetti

doi:10.1590/s1983-41952008000100001

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…Während [25,26] Biegezugfestigkeiten beim Erstriss ohne nähere Angabe zu Versuchsaufbau und Auswertung enthalten, wurden in [28,29,31,32,35,37] Spaltzugprüfungen zur Bestimmung der Nachrisszugfestigkeit durchgeführt. [1,33,34,36,39,40]…”

Section: Aufsatz Articleunclassified

Datenbank zum Durchstanzen stahlfaserverstärkter Flachdecken ohne Durchstanzbewehrung

Landler

Fischer

2021

Beton und Stahlbetonbau

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Die Durchstanzbemessung stahlfaserverstärkter Flachdecken erfolgt derzeit in Deutschland anhand der bauaufsichtlich eingeführten Richtlinie „Stahlfaserbeton” des Deutschen Ausschuss für Stahlbeton (DAfStb). Die Zugabe von Stahlfasern in den Beton ermöglicht nach dem Eintreten der Rissbildung eine effektive Zugkraftübertragung über den Riss hinweg und begrenzt die fortschreitende Rissöffnung, was sich für die Durchstanztragfähigkeit von Flachdecken als besonders günstig erweist. Zahlreiche Untersuchungen seit Mitte der 1970er Jahre bestätigten dies und ermöglichten die Ableitung empirischer und teils mechanisch basierter Ansätze zur rechnerischen Erfassung der Fasertragwirkung beim Nachweis einer ausreichenden Durchstanztragfähigkeit ohne Durchstanzbewehrung. Zur Bewertung und Weiterentwicklung dieser Ansätze wurde eine Datenbank zu Durchstanzversuchen an stahlfaserverstärkten Flachdecken ohne Durchstanzbewehrung aufgebaut. Unter Beachtung der zugrunde gelegten baupraktischen Anforderungen in Bezug auf die Plattendicke, den Längsbewehrungsgrad sowie die Betondruck‐ und die Nachrisszugfestigkeit konnten etwa 116 Versuche in die Durchstanz‐Datenbank „Stahlfaserbeton” aufgenommen werden. Dieser Beitrag stellt die Datenbank vor und diskutiert deren Auswertung hinsichtlich der Vorhersagegenauigkeit und des Sicherheitsniveaus der Bemessungsansätze nach der DAfStb‐Richtlinie „Stahlfaserbeton” sowie nach Model Code 2010.

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Section: Aufsatz Articleunclassified

Datenbank zum Durchstanzen stahlfaserverstärkter Flachdecken ohne Durchstanzbewehrung

Landler

Fischer

2021

Beton und Stahlbetonbau

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“…The geometry of the samples used in this research included the range of h = 55-180 mm, d = 39-150 mm, bc = 60-225. The data points in this dataset were acquired from the experimental studies available in the literature [12,14,15,[79][80][81][82][83][84][85][86][87][88][89][90][91]. Table 1 presents the statistical descriptions of the variables in this dataset to predict the punching shear strength (V).…”

Section: Experimental Data Collectionmentioning

confidence: 99%

A Novel Feature Selection Approach Based on Tree Models for Evaluating the Punching Shear Capacity of Steel Fiber-Reinforced Concrete Flat Slabs

Koopialipoor

Asteris

et al. 2020

Materials

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When designing flat slabs made of steel fiber-reinforced concrete (SFRC), it is very important to predict their punching shear capacity accurately. The use of machine learning seems to be a great way to improve the accuracy of empirical equations currently used in this field. Accordingly, this study utilized tree predictive models (i.e., random forest (RF), random tree (RT), and classification and regression trees (CART)) as well as a novel feature selection (FS) technique to introduce a new model capable of estimating the punching shear capacity of the SFRC flat slabs. Furthermore, to automatically create the structure of the predictive models, the current study employed a sequential algorithm of the FS model. In order to perform the training stage for the proposed models, a dataset consisting of 140 samples with six influential components (i.e., the depth of the slab, the effective depth of the slab, the length of the column, the compressive strength of the concrete, the reinforcement ratio, and the fiber volume) were collected from the relevant literature. Afterward, the sequential FS models were trained and verified using the above-mentioned database. To evaluate the accuracy of the proposed models for both testing and training datasets, various statistical indices, including the coefficient of determination (R2) and root mean square error (RMSE), were utilized. The results obtained from the experiments indicated that the FS-RT model outperformed FS-RF and FS-CART models in terms of prediction accuracy. The range of R2 and RMSE values were obtained as 0.9476–0.9831 and 14.4965–24.9310, respectively; in this regard, the FS-RT hybrid technique demonstrated the best performance. It was concluded that the three hybrid techniques proposed in this paper, i.e., FS-RT, FS-RF, and FS-CART, could be applied to predicting SFRC flat slabs.

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“…Numerous researches have been conducted on the use of steel fibre on slab structures [5] [8]. From previous research, hooked end steel fibre was found to be a suitable additional material to improve the performance of concrete such as mechanical resistance of concrete and ductility [9].…”

Section: Introductionmentioning

confidence: 99%

Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel

Samsudin

Hashim

Hamzah

et al. 2018

SRJ

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Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction ofribbed slab reduces concrete materials and thusthe cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2. The slab wastested underthree-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. Thisresearch showsthat SFRCRibbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

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Similaridades entre resistência à punção em lajes-cogumelo e ao cisalhamento em vigas de concreto armado com fibras de aço

Cited by 12 publications

References 4 publications

Datenbank zum Durchstanzen stahlfaserverstärkter Flachdecken ohne Durchstanzbewehrung

Datenbank zum Durchstanzen stahlfaserverstärkter Flachdecken ohne Durchstanzbewehrung

A Novel Feature Selection Approach Based on Tree Models for Evaluating the Punching Shear Capacity of Steel Fiber-Reinforced Concrete Flat Slabs

Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel

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