Extended Strip Model for slabs subjected to load combinations

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Abstract

The loads that are used for the assessment of existing reinforced concrete slab bridges are the self-weight, superimposed loads, and distributed and concentrated live loads. As such, the shear capacity of reinforced concrete slabs under a combination of distributed and concentrated live loads is a topic of practical relevance. For slabs subjected to a single concentrated load, a plastic model for assessment exists: the Extended Strip Model, developed based on the Strip Model for concentric punching shear. A further adaptation of the model to assess slabs subjected to distributed and concentrated loads is presented in this paper. The proposed model is compared to experiments on slabs subjected to a single concentrated load and a line load. The conclusion of this comparison is that the Extended Strip Model results in a safe estimate of the maximum concentrated load on the slab, and that the method can be used for the assessment of existing bridges subjected to heavy truck loads.

Original languageEnglish
Pages (from-to)60-69
Number of pages10
JournalEngineering Structures
Volume145
DOIs
Publication statusPublished - 15 Aug 2017

Keywords

  • Assessment
  • Extended Strip Model
  • Flexure
  • Live loads
  • Plasticity-based model
  • Punching
  • Reinforced concrete
  • Shear
  • Slab bridges

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