摘要
目前测定各种新型复合混凝土材料的抗冲击性能大多采用美国ACI 544规范中的落锤冲击试验。利用摆锤试验机进行了672块简支弯曲试件的冲击试验,获得了普通混凝土、钢纤维混凝土以及钢纤维自应力混凝土试件冲击破坏的吸收功,并根据各自的耗能值对其抗冲击性能作了比较,得到了体积率为1%的钢纤维自应力混凝土试件吸收功高于同体积率的钢纤维混凝土;随着钢纤维体积率的增加,试件吸收功会出现拐点,极值出现在2%到3%之间;并且试件的破坏形态逐渐从剪切破坏过渡到冲压破坏。
The impact resistance of all kinds of new composite concrete material is usually measured according to the falling weight im- pact test provided by ACI 544 specification. A number of 672 specimens were impacted in the three - point bending situation with pen- dulum machine. The energy absorbing of concrete, steel fiber reinforced concrete and steel fiber reinforced self - stressing concrete test specimens were obtained. Compared the impact capacity with respective energy consumption, it concluded that the energy absorbing of steel fiber reinforced self- stressing concrete test specimens with 1% fiber volume content was higher than that of same volume content steel fiber reinforced concrete specimens.The energy consumption of specimens would come to a inflection point as the volume content raising and the extreme value was between 2% and 3%, while the failure mode changed from shearing to stamping destruction gradually.
出处
《混凝土》
CAS
北大核心
2016年第2期77-80,共4页
Concrete
基金
国家自然科学基金资助项目(51108207)
吉林省青年科研基金资助项目(201201057)
关键词
钢纤维
自应力混凝土
冲击功
破坏形态
teel fiber
self - stressing concrete
impact energy
failure mode
