【摘要】 在大连理工大学自行研制的大型静、动态电液伺服试验系统上对两种湿度条件和两种温度条件下的混凝土进行了不同应变速率(1-0 5/s~1-0 2/s)下的动态压缩试验,系统研究了湿度、温度条件对混凝土材料动态抗压强度特性的影响,探索了混凝土材料产生应变速率敏感性的内在机理,发现动态抗压强度随应变速率增加而增加.研究表明,在室温(20℃)条件下,含水量高的混凝土应变速率敏感程度高;温度通过改变混凝土内部自由水的状态来影响混凝土的应变速率敏感性.更多还原

【Abstract】 Dynamic compressive tests were carried out on the servo-hydraulic static-dynamic testing machine designed and manufactured at Dalian University of Technology. The effect of temperature and moisture content on the strain rate sensitivity of concrete in compressive strength is investigated systematically and the dynamic fracture mechanism of concrete is also analyzed.From the test results it is shown that the dynamic ultimate compressive strength increases with the increasing of strain rate.At room temperature(20 ℃) the moisture content can enhance the strain rate sensitivity of concrete in compression.And temperature affects the strain rate sensitivity of concrete through changing the state of free water inside specimens.更多还原