中文摘要：

利用大连理工大学自行研制、改造的大型液压伺服混凝土静动试验系统进行动态压缩试验，研究应变速率以及初始静态荷载对混凝土动态强度和变形特性的影响。试验结果表明，随着应变速率的增加，混凝土的强度有增加的趋势；初始静态荷载对混凝土的动强度影响明显，随着初始荷载的增加，动强度有降低的趋势；在初始静态荷载较大时，动强度降低的趋势更为明显；动强度随初始静态荷载变化规律接近指数函数。同时发现，在应变速率发生变化的位置，切线弹性模量也发生改变；在较大初始静态荷载作用时，切线模量的改变尤为显著，值得引起重视。

英文摘要：

Dynamic compressive tests of concrete were carried out by using a static-dynamic test machine. The effects of strain rate and initial static load on dynamic strength and deformation characteristics of concrete in compression were investigated. It was revealed that the ultimate dynamic compressive strength increased with the increase of strain rate, and the initial static load was significantly influencing the final dynamic strength. Following the increase of initial static load the dynamic strength tended to decrease. The relationship between initial static load and dynamic compressive ultimate strength was formulated by an exponential function. At the critical point at which strain rate changed, the from the stress-strain curve also changed. When the concrete was subjected to change of tangential modulus became more remarkable. tangential modulus obtained higher initial static load, the change of tangential modulus became more remarkable.