混凝土多轴应力状态下的徐变研究

在搜集国内外有关资料的基础上,通过对混凝土在多轴应力作用下的徐变与强度关系分析,说明在多轴应力状态下不能简单地采用叠加原理。展示了新的三轴徐变量测仪器及其徐变试验成果以及2组多轴与单轴应力状态下的徐变恢复试验成果,并对试验数据进行比较分析,得到多轴应力状态下徐变恢复与应力大小以及持荷时间之间的规律,证实了多轴应力状态下的徐变恢复与已经产生的压缩徐变有密切的关系。

Study on concrete creep in state of multi-axial stress

Based on the collection of relevant data at home and abroad,it is demonstrated that the superposition principle is invalid for analysis of the relationship between creep and strength of concrete under multi-axial stress. The new triaxial creep measurement instrument as well as experimental result was introduced.By analysis of the experimental data of creep recovery under triaxial and uniaxial stresses in two groups,the relationships between the creep recovery,stress,and loading time were deduced,and it is verified that there is a close relationship between creep recovery and compression creep being produced under multi-axial stresses.