一种低应变率下钢纤维混凝土本构关系  

A constitutive relation of steel fiber reinforced concrete under low strain rate

作　　者：叶中豹 李永池[2] 赵凯[2] 林加剑[4] 张永亮[2] 赵雯[3] 王义[5] YE Zhong-bao;LI Yong-chi;ZHAO Kai;LIN Jia-jian;ZHANG Yong-liang;ZHAO Wen;WANG Yi(Department of Civil Engineering, Anhui Province Key Laboratory of Building Structure and Underground Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China;University of Science and Technology of China, Hefei 230026, Anhui, China;Anhui Xinhua College, Hefei 230088, Anhui, China;Anhui University, Hefei 230601, Anhui, China;Construction Engineering Quality Supervision and Testing Station in Anhui Province, Hef& 231000, Anhui, China)

机构地区：[1]安徽建筑大学土木工程学院建筑结构与地下工程安徽省重点实验室,安徽合肥230601 [2]中国科学技术大学,安徽合肥230026 [3]安徽新华学院,安徽合肥230088 [4]安徽大学,安徽合肥230601 [5]安徽省建筑工程质量监督检测站,安徽合肥231000

出　　处：《实验力学》2019年第2期284-288,共5页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(11402266;11502099;11772160;11472008;51608005);安徽高等学校省级自然科学重点研究项目(KJ2016A315;KJ2016A316;KJ2017A615);安徽省高校优秀青年人才支持项目(gxyq2018122);中央大学基础研究基金项目(WK2480000003)

摘　　要：采用岩石力学试验机,开展了同一低应变率下,钢纤维体积含量分别为0%、0.75%、1.5%、3%、4.5%、6%的混凝土材料的准静态力学试验,并获得了材料的应力-应变曲线,由试验结果可知:钢纤维混凝土材料的峰值应力、峰值应变随着纤维含量的增加而提高,材料达到峰值应力后呈现应力的应变软化特征。基于试验应力-应变曲线,提出了一种合理的钢纤维混凝土准静态本构关系,通过拟合试验应力-应变曲线,获得了相应的材料参数,拟合结果表明采用该形式的本构关系方程能很好地拟合试验曲线。In this paper, quasi-static performance experiment for six kinds of concrete material with steel fiber volume ratio of 0%、0. 75%、1.5%、3%、4. 5%、6% respectively, was carried out by using a rock tri-axial testing machine. Stress-strain curves of steel fiber reinforced concrete with different steel fiber volume ratio were obtained at the same low strain rate.Experimental results show that with the increase of fiber content, peak strain and peak stress of steel fiber r&nforced concrete material increase and the strain softening phenomenon occurs after the peak stress.Based on experimental results, a new constitutive equation of steel fiber reinforced concrete (SFRC) at low strain rate is proposed in this paper. By fitting experimental curve, the material parameters related to steel fiber contents were obtained. Fitting results show that the constitutive relation is in good agreement with the experimental data.

关 键 词：钢纤维混凝土 准静态试验 纤维含量 本构关系 

分 类 号：O347[理学—固体力学]