摘要
使用直径120 mm的霍普金森压杆对混凝土进行冲击压缩试验,研究混凝土初始强度对其动态压缩力学性能的影响。试件采用尺寸为φ117 mm×80 mm的圆柱形试件,通过对不同初始强度（54.82、63.75、84.00 MPa）、不同应变率（10~40 s-1）下的试件进行冲击压缩试验,发现：混凝土的动态抗压强度与其自身的强度具有较大的相关性,在应变率相同时,随着混凝土初始强度的升高,其DIF因子减小;不同初始强度的混凝土试件在应变率基本相同时,其破坏形态也基本一致,且随着应变率的提高,混凝土试件的破坏程度加深,试件破坏的碎块尺度显著减小。
The Split Hopkinson Pressure Bar（ SHPB ）of 120 mm was used to do the dynamic compression test of concrete and study the influence of different initial strength for the dynamic compression mechanical properties. The cylindrical specimen is φ117 mm × 80 ram. Based on the result of the dynamic compression test which the specimen is different initial strength （54.82,63.75,84.00 MPa） and different strain rate （10-40/s）, found those：The dynamic compressive strength of concrete has great correlation with its initial strength. When the strain rate remain the same, With the increase of initial strength, DIF is reduced, the enhancement effect of strain rate becomes weak;While the strain rate keeps the same, the concrete specimen of different strength has the same failure pattern.
出处
《混凝土》
CAS
北大核心
2015年第3期42-45,共4页
Concrete
基金
国防科工局国防基础研究项目(B3120110004)
国家自然科学基金(10972187)
