Effect of sustained service loading on post-fire flexural response of reinforced concrete T-beams

Chanachai Thongchom, Akhrawat Lenwari, Riyad S Aboutaha

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

This paper presents the effect of sustained service loading at elevated temperatures on the residual flexural response of reinforced concrete (RC) T-beams after exposed to elevated temperatures of 700 and 900°C (1292 and 1652°F) for 3 hours and then cooled in air. Two beams were subjected to a constant simulated service loading equal to 22.6% of undamaged (unheated) flexural strength, while the counterpart beams were exposed to fire without any applied sustained load. The test results showed that the bottom (tension) steel reinforcements in all fire-exposed beams had experienced the peak temperatures that were higher than a critical value (593°C [1099°F]) before the post-fire static test. The post-fire static test results showed that the sustained loading has a detrimental effect on the post-fire flexural response of RC beams. The effect was more pronounced on the post-fire stiffness and ductility than on strength. In the paper, simplified finite element models for predicting the temperature response and post-fire load-deflection relationships of fire-exposed RC beams are also described.

Original languageEnglish (US)
Pages (from-to)243-254
Number of pages12
JournalACI Structural Journal
Volume116
Issue number3
DOIs
StatePublished - Jan 1 2019

Keywords

  • Elevated temperatures
  • Finite element analysis
  • Fire damage
  • Flexural response
  • Reinforced concrete beams
  • Sustained service loading
  • Thermal response

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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