关键词: 玄武岩纤维混凝土梁;弯曲;承载力;挠度;应变

Abstract: Through the four point bending test of basalt fiber reinforced concrete beams ,analysis of their failure patterns and mechanisms . And study on the variation law of bearing capacity , deflection , toughness , concrete strain and steel strain of the beam with different basalt fiber content .Test results show that:basalt fiber reinforced concrete beam on the cracking load and ultimate load is enhanced , the maximum amplitude of the cracking load is 32％, and the maximum amplitude is 6 .5％.The deflection , ductility and toughness of basalt fiber reinforced concrete beams are better than that of ordinary reinforced concrete beams . The compressed concrete beam of basalt fiber has the ability to prevent crack propagation , when the upper compression zone of crushed concrete beam , concrete pieces will not peel in bridging fibers , the beam still maintain good integrity .

Key words: basalt fiber reinforced concrete beam;bend;bearing capacity;deflection;strain