钢纤维增强RPC受拉应力—应变曲线试验  

Tensile stress-strain curve of steel fiber reinforced RPC

作　　者：原海燕[1] 安明喆[2] 贾方方[2] 朱春梅[1] 

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《广西大学学报（自然科学版）》2015年第4期921-927,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：山东省科技厅优秀中青年科学家科研奖励基金项目(SBS1208);济南大学博士基金项目(XBS1040)

摘　　要：为得到钢纤维增强活性粉末混凝土(RPC)的受拉应力—应变曲线,采用自行设计的试验装置,完成了不同钢纤维体积掺量(Vf)时活性粉末混凝土的轴向拉伸试验,测出了Vf=1%、2%的活性粉末混凝土受拉应力—应变全曲线。试验结果表明,钢纤维增强RPC的受拉应力—应变全曲线分为上升段、峰值后应力骤降段、应力稳定段和下降段;随钢纤维掺量的增加,钢纤维增强RPC的抗拉强度、峰值应变、弹性模量增大,受拉破坏形式从脆性转变为延性。RPC的受拉峰值应变与其他混凝土相比无明显提高,其裂后延性优势应结合配筋形式发挥。In order to obtain the tensile stress-strain curve of steel fiber reinforced reactive powder concrete （ RPC） , axial tensile tests on reactive powder concrete were completed using a self-de-signed equipment. The complete tensile stress-strain curve of RPC with different volume fraction of steel fiber （ Vf=1%, 2%） were obtained through the test. The results indicate that the tensile stress-strain curve of RPC strengthened with steel fiber is composed of an upward section, a rapid drawdown section after the peak stress, a stable section and a downward section. With the increase of volume fraction of steel fiber, the tensile strength, the peak strain and the modulus of elasticity of the steel fiber reinforced RPC enlarge, and the tensile failure mode turns from brittleness to ductili-ty. Compared with other types of concretes, RPC has a tensile peek strain which is not obviously higher. The ductility of RPC should be applied with steel bars.

关 键 词：活性粉末混凝土 应力-应变曲线 轴向拉伸试验 钢纤维 

分 类 号：TU502[建筑科学—建筑技术科学]