钢纤维混凝土的受力破坏机制及力学性能研究

Study on the Failure Mechanism and Mechanical Properties of Steel Fiber Reinforced Concrete

采用试验和数值模拟相结合的方法,对比研究了普通混凝土和钢纤维混凝土的力学性能、应力-应变响应、破坏特征和声发射规律。结果表明:随着钢纤维体积掺量的增加,试件的抗压和抗折强度均呈先增大后减小的趋势,适宜掺量范围为2.0%~2.5%,超过该掺量范围后,试件的抗压和抗折强度降低;掺入适量钢纤维可增大混凝土的弹性模量和残余强度,增强混凝土的峰后延性,改善混凝土的破坏形态。

The mechanical properties,stress-strain response,failure characteristics and acoustic emission laws of ordinary concrete and steel fiber reinforced concrete were compared and studied by means of tests and numerical simulation.The results show that with the increase of steel fiber volume content,the compressive and flexural strength of the specimen first increase and then decrease,and the appropriate content range is 2.0%~2.5%.When the content range is exceeded,the compressive and flexural strength decrease.Adding appropriate content of steel fiber can increase the elastic modulus and residual strength of concrete,enhance the post-peak ductility of concrete,and improve the failure mode of concrete.