【摘要】 为研究混凝土的冲击损伤性能,采用落锤冲击试验机,首先对混凝土棱柱体试件进行冲击试验,之后对其进行轴心受压试验,获得不同损伤程度混凝土试件的应力-应变关系曲线。通过24个混凝土试件的试验,考察了强度等级、落锤高度和落锤重量等试验参数对其损伤性能的影响,描述了超声波损伤指标与混凝土峰值应力、峰值应变和弹性模量之间的关系。结果表明:超声波检测冲击损伤具有较高的灵敏度;受冲击混凝土弹性模量、抗压强度均有所降低;受冲击混凝土试块破坏形态因损伤发生了显著的脆性破坏。更多还原

【Abstract】 In this paper,the mechanical property of damaged concrete after impact was investigated. Firstly,the specimen was crushed by using drop hammer impact test machine in order to cause initial damage. Then compressionafter-impact tests were carried out to examine and compare the damage responses of the specimens,and some stressstrain curves of the specimens under different damage degrees were obtained. Test parameters,such as the strength grade,height of the fall and drop weight were studied. The damage behaviors of the 24 tested specimens with the acquired UT( ultrasonic test) data were analyzed. The experiment results indicate that using UT to test the damage of concrete is highly sensitive; Concrete elastic modulus and compressive strength after impact are reduced. Brittle fracture of the concrete specimen after impact is remarkable.更多还原