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.
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