A closed-form shear resistance model for regions of prestressed beams without flexural cracks

Marco A. Roosen*, Yuguang Yang, Cor van der Veen, Dick G. Schaafsma, Max A.N. Hendriks

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

When the shear resistance of prestressed beams with stirrups is determined with the current Eurocode, no distinction is made between regions with and without flexural cracks. This while it may be expected that a region without flexural cracks will have a higher shear resistance. This is due to the lower longitudinal strains and the narrow crack widths, resulting in a higher contribution of aggregate interlock. Also, the Eurocode does not take into account that in regions without flexural cracks, a significant part of the shear force is transferred through the uncracked flanges. This article proposes therefore a shear resistance model, based on Modified Compression Field Theory (MCFT), that does consider the low longitudinal strains and shear transfer through the uncracked flanges. From a comparison it was found that the proposed model can determine shear resistance as accurately as the most comprehensive level III approach of the Model Code 2010. However, the proposed model was found to be much easier to use in engineering practice as no iterations are necessary.

Original languageEnglish
Pages (from-to)1304-1315
Number of pages12
JournalStructural Concrete
Volume23
Issue number3
DOIs
Publication statusPublished - 2022

Keywords

  • existing structures
  • prestressed concrete
  • regions without flexural cracks
  • shear resistance
  • web-shear failure

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