Prediction of performance of UHPFRC flexural member under blast loading
Rizwanullah, H.K. Sharma
Department of Civil Engineering, National Institute of Technology, Kurukshetra, (Haryana) India
Spalling and Scabbing;
An explosion within or near a building can cause terrible damage to the building. Ultra-high performance fibre reinforced concrete (UHPFRC) increases the strength and ductility of designing the structural elements with reduced sections. UHPFRC has a better load-carrying capacity, tensile strength (TS), and enhanced energy absorption capacity than the normal strength concrete (NSC) and high-performance concrete (HPC). This study focuses on understanding the behaviour of UHPFRC and HPC structural elements when subjected to the blast loading. Stress-strain behaviour, total deformation versus time response, and other ductility associated characteristics of UHPFRC based structural elements under blast loading of different charge weights were investigated. The design was carried out according to unified facilities criteria (UFC: 3-340-02). The total deformation of the beam was verified and compared with computed ANSYS R18.1 generated result. A significant reduction in total deformation was observed in UHPFRC compared to HPC and NSC structural elements. Flexural member designed to withstand a blast of 1.315 kN was found to resist a blast load of 5 kN within elastic range and up to 15 kN in the plastic field due to the inclusion of UHPFRC. The use of UHPFRC made the structural elements to reduced section dimensions thereby, decreasing the dead load, which is always advantageous in earthquake-resistant structures. UHPFRC can benefit blast-resistant facilities under high strain rates because of its extremely higher force capacity for the same size and reinforcement.
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