混凝土动态抗剪特性试验研究

【作者】 李红； 宫必宁； 王伟；

【机构】 河海大学水利水电工程学院；

【摘要】 地震作用下混凝土动力反应和破坏过程极其复杂,结构的抗震设计是否安全、合理,不仅取决于抗震动力分析,而且取决于设计采用的地震动参数和混凝土材料动态力学参数,故而混凝土动态特性研究对结构的设计有着重要的意义。本文基于振动台的抗剪试验结果,从动态力学的性质方面进行了研究和探讨,提出了两种效应观点:一方面,频率的加载速率效应使得材料强度倾向于提高;另一方面,频率的疲劳损伤效应使得材料强度倾向于降低。材料强度的最终表现,则取决于这两个方面各自影响力大小。更多还原

【Abstract】 Dynamic response and failure process of concrete structures under earthquake are very complicated. Safety and reasonableness of structures’earthquake-resistance design rely not only on dynamic analytical methods of earthquake-resistance,but also on parameters of earthquake motion and dynamic mechanical parameters of concrete.It is significant to study dynamic behavior of concrete for the design of structures. Based on the experimental data on shaking table,this paper studies the dynamic shearing properties of concrete material,and puts forword a theory of two effects about the influence mechanism of loading frequency on shearing strength.On the one hand,the effect of loading velocity causes the strength to increase;on the other hand,the effect of fatigue damage causes the strength to decrease.The final strength is decided by the summation of the above two effects.更多还原