关键词: 破坏形态;应变;混杂纤维;受剪承载力

Abstract: Taking different dopants as experimental parameters, comparison experiment on one group(replacement rate 50%) of ordinary RAC beams and three groups of RAC beams of different dopants was carried out.Under condition of the same shear cross ratio and stirrup ratio, research different brick particle content, content of silica fume and the fiber content effects on the damage form, vertical stirrup strain and shear bearing capacity of RAC beams.The results show that the rupture process and morphology of RAC beams and ordinary RAC beams is basically the same, but the incorporation of silica fume is relatively little impact on the performance of the RAC, and with the incorporation of brick grain, the shear capacity is reduced, on the contrary, the hybrid fiber makes the shear capacity significantly improved RAC beam finally;according to the analysis of experimental data, more in line with the actual ultimate bearing capacity improved empirical regression formula.

Key words: failure mode;strain;hybrid fiber;shear capacity