Explosions and fires in tunnel, potential hazards from highly-energetic materials stored in tanks and reservoirs terroristic attacks are becoming safety issues. For such reason, the mechanical response of concrete structure subjected to impact loading and high temperature, main load conditions present in a blast scenario, cannot be ignored in the design, but they have to be predicted and controlled starting by investigation on proper material models for cementitious composites, and their response to strain-rate effects and thermal damage. The mechanical behaviour of cementitious composites when are subjected to extreme temperatures, impacts or blast has still many aspects open to investigation. As a matter of fact a scanty information provided so far by such special equipments as the Hopkinson bar for very high strain rates (as in explosions) shows significant increases in peak strength, but these increases can provide a scanty information to design a structure subjected to a dynamic load. Moreover fibre cementitious composites are often used to improve the impact resistance, preventing scabbing and fragmentation problems, due to their ability in energy absorption, but the link between the dynamic energy and the static energy absorption, its strain rate sensitivity and thermal damage influence are not clear yet. In the paper some preliminary results on the behaviour of thermally damaged HPFRC subjected to high strain rate are presented and compared with results obtained in a static range.

Behaviour of advanced cementitious composites under dynamic loadig and fire

CAVERZAN, ALESSIO;DI PRISCO, MARCO
2009-01-01

Abstract

Explosions and fires in tunnel, potential hazards from highly-energetic materials stored in tanks and reservoirs terroristic attacks are becoming safety issues. For such reason, the mechanical response of concrete structure subjected to impact loading and high temperature, main load conditions present in a blast scenario, cannot be ignored in the design, but they have to be predicted and controlled starting by investigation on proper material models for cementitious composites, and their response to strain-rate effects and thermal damage. The mechanical behaviour of cementitious composites when are subjected to extreme temperatures, impacts or blast has still many aspects open to investigation. As a matter of fact a scanty information provided so far by such special equipments as the Hopkinson bar for very high strain rates (as in explosions) shows significant increases in peak strength, but these increases can provide a scanty information to design a structure subjected to a dynamic load. Moreover fibre cementitious composites are often used to improve the impact resistance, preventing scabbing and fragmentation problems, due to their ability in energy absorption, but the link between the dynamic energy and the static energy absorption, its strain rate sensitivity and thermal damage influence are not clear yet. In the paper some preliminary results on the behaviour of thermally damaged HPFRC subjected to high strain rate are presented and compared with results obtained in a static range.
2009
self compacting mortar; high strength; steel fibres; uniaxial tension behaviour; fracture; thermal damage; residual behaviour; high strain rates
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/567603
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