Effect of elevated temperature on the mechanical properties of high-strain-rate-induced partially damaged concrete and CFSTs

Mahsa Mirmomeni, Amin Heidarpour, Xiao Ling Zhao, Jeffrey A. Packer

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

The present research investigates the effect of high temperatures on the mechanical properties of plain concrete as well as steel-concrete composite samples which have previously sustained partial damage under high-strain-rate loading. With the rise of interest in investigating extreme loading events such as post-impact-fire scenarios, this study will help in evaluating whether partially damaged concrete and composite elements can further sustain additional stresses in case of a subsequent fire outbreak. Unconfined self- compacting concrete (SCC) and SCC-filled mild steel tube (CFST) samples are subjected to a dual-phase testing procedure where they undergo interrupted compressive loading at impact rates of strain, controlled locally at pre-defined damage levels to account for different deformation states. Damaged specimens are subsequently exposed to elevated temperatures and the residual mechanical properties of the samples are measured under quasi-static compression test conditions. Results indicate that for concrete and CFSTs, variation of residual properties is dependent on the level of pre-induced damage as well as exposed temperature, with the effect of pre-deformation losing significance at very high temperatures. Residual characteristics of CFSTs are shown to be reliant on rate and temperature dependency of both constituent materials. Furthermore, X-ray imaging has been utilized to investigate the extent of cracking and crack propagation at different damage levels.

Original languageEnglish
Pages (from-to)346-358
Number of pages13
JournalInternational Journal of Impact Engineering
Volume110
DOIs
Publication statusPublished - Dec 2017

Keywords

  • Concrete-filled steel tube
  • Elevated temperatures
  • High-strain-rate loading
  • Partial damage
  • Self-compacting concrete

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