三向应力状态下钢纤维混凝土动态特性试验研究  

Experimental study on dynamic characters of steel fiber reinforced concrete under triaxial pressure

作　　者：徐超[1] 彭刚[1] 戚永乐[1] 雷敏[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《混凝土》2011年第6期23-25,28,共4页Concrete

基　　金：国家自然科学基金项目(50679039);国家自然科学基金重大项目(90510017);中国博士后基金项目(20060390832)

摘　　要：研究了三向应力状态下钢纤维含量为0和2.0%的混凝土在应变速率为10-5、10-4、5×10-4 s-1时的强度特性和变形特性;试验过程采用变形控制。试验结果表明,钢纤维混凝土与素混凝土常规三轴峰值应力随围压的提高而增长明显,同种混凝土在相同围压下,其抗压强度随着应变速率的提高而提高;钢纤维混凝土与素混凝土的常规三轴峰值应变、耗能能力均随围压和应变速率的提高而提高;低应变速率能更好地发挥钢纤维的阻裂性能,围压削弱钢纤维在混凝土中的阻裂效能;建立了钢纤维混凝土的空间破坏准则,计算强度与试验数据拟合较好。The strength character and deformation character of steel fiber reinforced concrete（SFRC） with 0 and 2.0% steel fiber content at different strain rates（10-5,10-4,5×10-4 s-1） under triaxial state of stress are investigated;The experimental process is controlled by deformation.The experimental results show that,triaxial peak stress of plain concrete and SFRC are improved clearly as confining pressure increased,if the compressive strength is the same and with same confining pressure,the strength of concrete is increased as strain rates increased;The triaxial peak strain,energy absorption capability of plain concrete and SFRC are also improved as confining pressure and strain rates increased;The character that prevent cracking of steel fiber is more clearly under low strain rates,and this character is weaken by confining pressure;The space failures criterion of steel fiber reinforced concrete is established,and the strengths of calculation fit well with experimental results.

关 键 词：钢纤维混凝土 常规三轴 应变率 破坏准则 

分 类 号：TU528.01[建筑科学—建筑技术科学]