中文摘要：

混凝土静载强度是结构设计的理论基础，在涉及抗震部分的验算时只是将静载强度乘以一个系数作为调整来反映地震作用对结构的影响。实际上在地震荷载的作用下，结构的地震响应非常复杂，不同的建筑物或者建筑物不同的部位，其应变率的变化各不相同，单纯用一个系数调整显然过于简单。通过对C50混凝土试件进行10-、10-4、10-3、10-2／s四个应变率下的轴拉试验来研究高强度混凝土在动载下极限强度、弹性模量、泊松比、表面微裂缝开展与应变率的关系。

英文摘要：

Concrete static load strength is the theoretical basis of structure design.To reflect the impact of the earthquake effects on structures,it was multiplied by a factor in the seismic calculation.In fact,the seismic response of structures under earthquake is complicated.For different buildings or different parts of the building, the strain rate changes differently, only one factor can not reflect the all.Axial tension test under the strain rate of 10-5 , 10-4, 10-3 10-2/s of C50 concrete specimens was conducted to study the relationship between ultimate strength, elastic modulus, PoiSSon＇s ratio, surface micro-cracks and strain rate.