Abstract
Understanding the dynamic response of Ultra-High Performance Fibre-Reinforced Concrete has important implications for engineering applications, including protective structures and critical infrastructures. It is wellknown that the loading rate affects both material failure mechanism and mechanical properties such as strengths and absorbed energy. Moreover, materials properties are influenced by stress confinement, which usually occurs in a real structure. The aim of this preliminary experimental campaign was to analyse the behaviour of the dynamic response of UHPFRC and its matrix under compression considering a pre-compression state of 56.5 MPa (about 1/3 of the failure stress). Compression at high stress rate (1.5 TPa/s) were carried out on cylindrical specimens with diameter of 30mm and three different heights of 30, 45 and 60 mm, respectively. An increment of strength and fracture time has been observed while increasing of the length of the specimen and a slight reduction of both quantities with the introduction of fibres for the longer specimens. The experimental results are analysed and discussed with the aim to better understand the mechanical behaviour of UHPFRC materials in case of dynamic event under service loading conditions and to study the size-effect on the material response.
Highlights
IntroductionDynamic loads (impact, blast, strong earthquake, etc) are accidental loads acting on building and infrastructures designed to withstand both service and accidental loads
Dynamic loads are accidental loads acting on building and infrastructures designed to withstand both service and accidental loads
Materials properties are influenced by stress confinement, which usually occurs in a real structure. The aim of this preliminary experimental campaign was to analyse the behaviour of the dynamic response of UHPFRC and its matrix under compression considering a pre-compression state of 56.5 MPa
Summary
Dynamic loads (impact, blast, strong earthquake, etc) are accidental loads acting on building and infrastructures designed to withstand both service and accidental loads. For a better comprehension of these phenomena it is necessary to subject the test specimen to static (mono-bi-tri-axial) state of stress prior to the impact loading. For this purpose a new experimental device was developed, named 3DModified Hopkinson Bar (3D-MHB) [1,2,3]. The testing campaign carried out by means of the 3D-MHB device was addressed to analyse the behaviour of the dynamic response of UHPFRC in compression aimed at analysing precompression state and by varying the size of the specimen. The experimental results are analysed and discussed with the aim to better understand the mechanical behaviour of UHPFRC materials in case of dynamic event under service loading conditions and considering the size effect on the material response
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