Influence of steel fibers on the shear and flexural performance of high-strength concrete beams tested under blast loads

[摘要] This paper presents the results of a study examining the effect of steel fibres on the blast behaviour of high-strength concrete beams. As part of the study, a series of three large-scale beams built with high-strength concrete and steel fibres are tested under simulated blast loading using the shock-tube testing facility at the University of Ottawa. The specimens include two beams built with conventional high-strength concrete (HSC) and one beam built with high-strength concrete and steel fibres (HSFRC). The effect of steel fibres on the blast behaviour is examined by comparing the failure mode, mid-span displacements and, overall blast resistance of the specimens. The results show that the addition of steel fibres in high-strength concrete beams can prevent shear failure and substitute for shear reinforcement if added in sufficient quantity. Moreover, the use of steel fibres improves flexural response under blast loading by reducing displacements and increasing blast capacity. Finally, the provision of steel fibres is found to improve the fragmentation resistance of high-strength concrete under blast loads.

[发布机构] Department of Civil Engineering, University of Ottawa, Ottawa; ON; K1N5S5, Canada^1

[关键词] Flexural performance;Flexural response;High strength concretes;High-strength concrete beams;Mid-span displacements;Shear reinforcement;Testing facility;University of Ottawa