Crítica de la CSCT para los artículos del Código Modelo sobre la resistencia a cortante y su efecto de escala en vigas de hormigón armado

Abdullah Dönmez, Zdenk P. Bažant*

*Bu çalışma için yazışmadan sorumlu yazar

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Özet

The size effect of Muttoni et al.’s critical shear crack theory (CSCT) is shown to be quite close (with differences up to 15%) and asymptotically identical to the energetic size effect law (SEL), which has been extensively verified experimentally and theoretically (and is adopted for the 2019 ACI Code, Standard 318, for both beam shear and punching). However, the CSCT derivation and calculation procedure obfuscates the mechanics of failure. It is shown to rest on six scientifically untenable hypotheses, which would have to be taught to students as an article of faith. They make CSCT untrust-worthy outside the testing range; ditto for beams with T, I and box cross section, or for continuous beams. The present conclusions are supported by experimentally calibrated finite element simulations of crack path and width, of stress distributions and localizations during failure, and of strain energy release. The simulations also show the CSCT to be incompatible with the “strut-and-tie” model, which is (for 2019 ACI Code) modernized to include the size effect in the compression strut. Finally, further deficiencies are pointed out for the Modified Compression Field Theory (MCFT), currently embedded in the Model Code.

Tercüme edilen katkı başlığıCritique of Critical Shear Crack Theory for fib Model Code Articles on Shear Strength and Size Effect of Reinforced Concrete Beams
Orijinal dilİspanyolca
Sayfa (başlangıç-bitiş)41-53
Sayfa sayısı13
DergiHormigon y Acero
Hacim75
Basın numarası302-303
DOI'lar
Yayın durumuYayınlandı - 22 Şub 2024

Bibliyografik not

Publisher Copyright:
© 2024 Hormigón y Acero, the journal of the Spanish Association of Structural Engineering (ACHE).

Finansman

Se agradece la financiación parcial dada por el proyecto NSF no. CMMI-1439960 de la Universidad de Northwestern. El primer autor agradece al Consejo de Investigación Científica y Tecnológica de Turquía el apoyo financiero a su investiga-ción postdoctoral en la Universidad de Northwestern.

FinansörlerFinansör numarası
Consejo de Investigación Científica y Tecnológica de Turquía

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