冻融作用下BFRC轴向拉伸本构模型研究  

Constitutive Analysis About Axial Tension of BFRC Under Freeze-thaw Action

作　　者：皇民 赵玉如 毕洁同 王松 HUANG Min;ZHAO Yu-ru;BI Jie-tong;WANG Song(School of Civil Engineering,Henan Institute of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院土木工程学院,河南郑州451191

出　　处：《混凝土与水泥制品》2020年第9期47-51,共5页China Concrete and Cement Products

基　　金：国家自然基金项目(50878187);河南省科技攻关计划(162102310403);河南省教育厅自然科学研究重点项目(12A560004);郑州市科技发展计划项目(20130816);河南工程学院博士基金项目(D2012008)。

摘　　要：设计了5组不同玄武岩纤维体积掺量(0、0.1%、0.2%、0.3%和0.4%)的混凝土试件,并对其进行了冻融循环试验和轴向拉伸试验。结果表明,玄武岩纤维提高了混凝土的轴向拉伸强度,纤维掺量越大,峰值应力越大,峰值应变也相应提高,试件表现出较好的延性破坏特征。冻融循环过程降低了混凝土轴向拉伸强度,而玄武岩纤维可以减弱混凝土的冻融损伤。玄武岩纤维的最佳体积掺量为0.3%。通过对试验数据进行拟合,得到了玄武岩纤维混凝土(BFRC)的轴向拉伸应力-应变本构关系和冻融损伤演化方程,并在此基础上建立了BFRC在冻融环境下的轴向拉伸应力-应变本构模型。Five groups of specimens with different volume fractions of basalt fibers(0,0.1%,0.2%,0.3%and 0.4%)were designed,and the freeze-thaw cycle test and the axial tension test were carried out on the specimens.The test results show that the basalt fiber improves the axial tensile strength of concrete;the higher the fiber content,the higher the peak stress and the peak strain;the specimen shows better ductile failure characteristics.Freeze-thaw cycle reduces the tensile strength of concrete,while basalt fiber can decrease the freeze-thaw damage of specimens.The optimum volume content of basalt fiber is 0.3%.By fitting the experimental datas,the stress-strain constitutive relation and the freeze-thaw damage evolution equation of basalt fiber reinforced concrete(BFRC)are obtained,and on this basis,the stress-strain constitutive model of BFRC under freeze-thaw environment is established.

关 键 词：冻融循环 玄武岩纤维 混凝土 轴向拉伸 本构模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]