Numerical model to determine shear capacity of reinforced concrete deep beams exposed to fire

Shengxin Fan*, Kang Hai Tan, Minh Phuong Nguyen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

This paper introduces a preliminary numerical model used for simulation of reinforced concrete (RC) deep beams subjected to ambient and elevated temperature. A model for deep beams at ambient temperature condition is first proposed. Calibration of the model is achieved by comparing numerical predictions with test data collected from published literature. Subsequently, modifications to the model are adopted, including adjustments of material constitutive models, and considerations of thermal gradient and thermal restraint. Results from this study demonstrate that failure mode changes from shear to flexural-shear failure when temperature effect is considered. Strength reductions up to 67% are observed when the beam models are heated. Furthermore, diagonal concrete struts become wider in restrained beams compared to unrestrained beams. Improvement on beam strength and stiffness from unrestrained beams and change of failure mode to strut splitting are noted. The study also indicates that the strut-and-tie design approach in ACI 318 gives over-conservative predictions on shear strength of deep beams exposed to fire.

Original languageEnglish
Title of host publicationHigh Tech Concrete
Subtitle of host publicationWhere Technology and Engineering Meet - Proceedings of the 2017 fib Symposium, 2017
EditorsD.A. Hordijk, M. Lukovic
Publisherfib. The International Federation for Structural Concrete
Pages1410-1419
Number of pages10
ISBN (Print)9783319594705
DOIs
Publication statusPublished - 2018
Externally publishedYes
EventInternational fib Symposium on High Tech Concrete: Where Technology and Engineering Meet, 2017 - Maastricht, Netherlands
Duration: Jun 12 2017Jun 14 2017

Publication series

Namefib Symposium
ISSN (Print)2617-4820

Conference

ConferenceInternational fib Symposium on High Tech Concrete: Where Technology and Engineering Meet, 2017
Country/TerritoryNetherlands
CityMaastricht
Period6/12/176/14/17

Bibliographical note

Publisher Copyright:
© Springer International Publishing AG 2018.

ASJC Scopus Subject Areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (miscellaneous)

Keywords

  • Deep beam
  • Discontinuity region
  • Elevated temperature
  • Numerical modelling
  • Shear capacity

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