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 language | English |
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Title of host publication | High Tech Concrete |
Subtitle of host publication | Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium, 2017 |
Editors | D.A. Hordijk, M. Lukovic |
Publisher | fib. The International Federation for Structural Concrete |
Pages | 1410-1419 |
Number of pages | 10 |
ISBN (Print) | 9783319594705 |
DOIs | |
Publication status | Published - 2018 |
Externally published | Yes |
Event | International fib Symposium on High Tech Concrete: Where Technology and Engineering Meet, 2017 - Maastricht, Netherlands Duration: Jun 12 2017 → Jun 14 2017 |
Publication series
Name | fib Symposium |
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ISSN (Print) | 2617-4820 |
Conference
Conference | International fib Symposium on High Tech Concrete: Where Technology and Engineering Meet, 2017 |
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Country/Territory | Netherlands |
City | Maastricht |
Period | 6/12/17 → 6/14/17 |
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