初始静荷载下的混凝土动力强度研究

Dynamic Strength of Concrete under Initial Static Load

在土木工程中,混凝土结构都不可避免的会承受动力荷载,并且混凝土结构的动力荷载总是在一定静力荷载基础上叠加的,但现有大多数研究都是基于材料直接承受动力荷载进行的,因此有必要研究初始静荷载对混凝土动力特性的影响。本文计算了含裂纹体在不同初始静荷载下的动力响应,在直接承受动力荷载的混凝土强度与加载速率关系基础上,研究了不同初始静力荷载下动力荷载惯性和破坏时间的关系;在适当简化下分析了初始静荷载对混凝土的动力抗拉、抗压强度的影响规律,对现有文献中的试验现象做出了定性的解释和定量的分析,可为混凝土结构动力分析提供参考。

In a civil engineering, concrete structures always suffer a dynamic load, furthermore, the dynamic load are always added at the base of some extent of static load. Thus it is very important to research the dynamic properties of concrete material under the initial static load. The dynamic strength of concrete under the different initial static load is investigated and calculated by using a single crack model with consideration of free water viscosity.The relationship between the dynamic strength increasing factor and the static stress level is obtained. It is indicated by comparison that the results by the model proposed in this paper agree with those by experiments in some available references.