高温后钢-玄武岩混杂纤维混凝土动态力学性能研究OA北大核心

In order to study the influence of high temperature on the dynamic mechanical properties of steel-basalt hybrid fiber reinforced concrete(HFRC),a φ50 mm split Hopkinson pressure bar(SHPB)system was used to carry out dynamic compression and dynamic splitting experiments on steel fiber reinforced concrete(SFRC),basalt fiber reinforced concrete(BFRC),and hybrid fiber reinforced concrete at different temperatures(25,100,200,400,600,800 ℃).The volume content of steel fiber and basalt fiber was 1％and 0.2％,respectively.The dynamic stress-strain process under different temperature conditions was obtained.The corresponding dynamic compressive strength,dynamic splitting strength and peak strain were obtained.The results show that the residual mechanical properties of specimens can be ensured at high temperature by adding basalt fiber,and the dynamic splitting tensile strength of specimens can be improved obviously by adding steel fiber.Temperature damage softening has an important effect on the mechanical properties of concrete.The addition of steel fiber and basalt fiber can effectively relieve the deterioration of high temperature,and steel-basalt hybrid fiber concrete exhibits better mechanical properties under normal and high temperature conditions.