铁道科学与工程学报2018，Vol.15Issue(6)：1415-1423,9.
普通混凝土落锤冲击动态力学性能试验研究
Experimental study on dynamic mechanical properties of ordinary concrete under drop hammer impact loading
摘要
Abstract
In order to investigate the dynamic behavior of ordinary concrete under impact loading, the low-speed impact tests on C30 concrete cylindrical specimens were carried out by using an improved drop hammer test setup. The rubber and sponge with different thickness were used as shaper to reduce the impact inertia effect and obtain steady loading rate. The 20 mm thick rubber pad significantly reduced the inertia effect and prolonged the loading time duration. The longitudinal stress of the specimens tended to uniformly distribute and led to a constant loading rate. The test results show that the concrete failure mode under impact loading is the same as that under static loading. Furthermore, dynamic increase factor (DIF), ultimate strain and energy-absorption increase with the increase of strain rate. However, it is found that within the test parameters of this paper, the strain rate has little effect on the shape of stress-strain curves of concrete. Moreover, the dynamic tests on concrete from the literature were further summarized and compared. The formula recommended by CEB2010 can conservatively describe the relationship between DIF and strain rate. The results in this paper filled in the blank within the strain rate range of 10-1/s～100/s for the existing testing data.关键词
落锤冲击/混凝土/波形整形/惯性力/动态增大系数Key words
drop hammer impact/concrete/wave shaping/inertial force/dynamic increase factor分类
建筑与水利引用本文复制引用
刘练,霍静思,刘艳芝,王海涛,谭清华..普通混凝土落锤冲击动态力学性能试验研究[J].铁道科学与工程学报,2018,15(6):1415-1423,9.基金项目
国家自然科学基金资助项目(51378200,51438010) （51378200,51438010）
教育部新世纪优秀人才计划资助项目(NCET-11-0123) （NCET-11-0123）
