CAJ | 학술논문

采用准100 mm分离式霍普金森压杆系统以及自主研制的高温加热设备，研究了高温下素混凝土以及钢纤维混凝土的冲击吸能特性，分析了温度、加载速率等因素对混凝土吸能特性的影响规律。结果表明：钢纤维混凝土较素混凝土在冲击能量吸收方面性能更加优异，具有更高的韧性；混凝土的能量密度随加载速率的提高而增大，随作用温度的升高而减小；高温对能量密度的弱化效应比加载速率引起的强化效应表现更为突出，造成材料能量密度下降。
채용준100 mm분리식곽보금삼압간계통이급자주연제적고온가열설비，연구료고온하소혼응토이급강섬유혼응토적충격흡능특성，분석료온도、가재속솔등인소대혼응토흡능특성적영향규률。결과표명：강섬유혼응토교소혼응토재충격능량흡수방면성능경가우이，구유경고적인성；혼응토적능량밀도수가재속솔적제고이증대，수작용온도적승고이감소；고온대능량밀도적약화효응비가재속솔인기적강화효응표현경위돌출，조성재료능량밀도하강。
A 100 mm diameter split Hopkinson pressure bar and a home-grown heating equipment were used to experimentally study the impact energy absorption characteristics of plain concrete and steel fiber reinforced concrete at elevated temperatures.The effects of temperature and loading rate on the energy absorbing features of concretes were investigated.The results showed that compared with plain concrete,steel fiber reinforced concrete had a more excellent performance in absorbing impact energy and it had a higher ductility.The en-ergy density of concrete increased with the rising of loading rate and decreased with the rising of temperature.The weakening effect caused by temperature was more pronounced than the strengthening effect caused by loading rate on energy density of concrete ,and the energy density of concrete eventually descended with the influence of two efforts.