摘要
本文研究了循环加载历史对混凝土断裂韧度及断裂能的影响，用楔入劈拉试验对混凝土试块施加频率为１０ＨＺ的高频预加拉伸荷载，测出荷载－位移全过程曲线，通过与未承受加载历史的混凝土准静态断裂参数比较，发现当预加拉伸荷载强度超过某一特定值后，混凝土的抗裂能力显著降低。因此，混凝土的断裂参数不是独立于加载历史的物理量。
This paper reports the results of an experimental study of the effect of cyclic loading history on the fracture toughness and fracture energy of concrete. Wedge splitting test with 20cm notched concrete cubes preloaded by 10 Hz cyclic tension has been carried out and the load -displacement diagrams are obtained. In comparison with the results of quasi-static test where no preload was applied, it was found that the fracture strength of concrete noticeably decreased if the preloading capacity greater than a certain threshold value. Hence. it is concluded that the fracture parameter of concrete are not independent of loading history.
出处
《水利学报》
EI
CSCD
北大核心
1994年第5期25-30,44,共7页
Journal of Hydraulic Engineering
基金
国家自然科学基金
关键词
混凝土
断裂特性
循环加载
wedge splitting test
loading history
fracture energy
fracture toughness
