Shear strength of straight concrete members without shear reinforcement. Reassessment of the effectiveness factors used in the crack sliding theory

Jens-Christian Kragh-Poulsen*, Mogens Peter Nielsen, Per Goltermann

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Recently it has been shown that the effectiveness factors used in the crack sliding theory are not well suited for predicting the shear strength of beams with large depths. Therefore, formulas for the effective concrete compression strength and the effective tensile strength have been reformulated by changing the size effect factor and adding a term to take into account the maximum aggregate size. Also, the theory has been improved to predict better the shear strength of deep beams and beams with short shear span. This is done by including the effect of the transverse stress. Experimental data for slender beams and deep/short beams with rectangular cross sections have been used for validation of the crack sliding theory. The outcome of this analysis is that the new theory in general are substantially better for predicting shear strength than the old one.
    Original languageEnglish
    JournalStructural Concrete
    Volume21
    Issue number3
    Pages (from-to)966-982
    ISSN1464-4177
    DOIs
    Publication statusPublished - 2020

    Keywords

    • Deep beams and beams with short shear span
    • Maximum aggregate size
    • Shear strength
    • Size effect
    • Slender beams
    • Transverse stress

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