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 language | English |
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Pages (from-to) | 346-358 |
Number of pages | 13 |
Journal | International Journal of Impact Engineering |
Volume | 110 |
DOIs | |
Publication status | Published - Dec 2017 |
Externally published | Yes |
Keywords
- Concrete-filled steel tube
- Elevated temperatures
- High-strain-rate loading
- Partial damage
- Self-compacting concrete
ASJC Scopus subject areas
- Civil and Structural Engineering
- Automotive Engineering
- Aerospace Engineering
- Safety, Risk, Reliability and Quality
- Ocean Engineering
- Mechanics of Materials
- Mechanical Engineering