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钢纤维混凝土准静态和冲击三轴劈拉强度实验研究

发表时间:2014-08-15  浏览量:1590  下载量:633
全部作者: 曲嘉,邹广平,夏培秀
作者单位: 哈尔滨工程大学航天与建筑工程学院
摘 要: 为研究混凝土材料的拉-拉-压三轴强度,建立混凝土球型试样主应力比值为σ1∶σ2∶σ3=0.24∶0.24∶-1.00的劈拉实验方法,并分别采用万能材料试验机和分离式霍普金森压杆(split Hopkinson pressure bar, SHPB)对钢纤维掺量为1%的混凝土球型试样进行准静态劈拉实验和动态劈拉实验。准静态实验中,钢纤维混凝土试样的平均应变率为8.3×10-5 s-1,劈拉强度为0.77 MPa,与已有研究结果相符。高应变率实验中,试样平均应变率为170 s-1,劈拉强度为1.01 MPa,与准静态实验结果对比表明:钢纤维混凝土劈拉强度随应变率增加而增加。
关 键 词: 实验固体力学;三轴劈拉强度;分离式霍普金森压杆;钢纤维混凝土;主应力比;应变率
Title: Experimental study of steel fiber reinforced concrete tri-axial split strength under quasi-static and impact loading
Author: QU Jia, ZOU Guangping, XIA Peixiu
Organization: College of Aerospace and Civil Engineering, Harbin Engineering University
Abstract: Splitting tensile test methodology has been established for the concrete spheriform specimens with the principal stress ratio σ1∶σ2∶σ3=0.24∶0.24∶-1.00 in order to study the tensile-tensile-compressive tri-axial strength. With the application of universal material testing machine and split Hopkinson pressure bar (SHPB), the quasi-static and dynamic splitting tensile tests have been exerted for the concrete spheriform specimens with 1% steel fiber dosage. In the quasi-static test, the average strain rate of the steel fiber reinforced concrete specimens is 8.3×10-5 s-1 and the splitting tensile strength is 0.77 MPa, which is consistent with the existing papers. In high strain rate tests, the average strain rate is 170 s-1 and the splitting tensile strength is 1.01 MPa. Compared with the quasi-static testing results, it is shown that the splitting tensile strength of steel fiber reinforced concrete increases with the rise of strain rate.
Key words: experimental solid mechanics; tri-axial split strength; split Hopkinson pressure bar; steel fiber reinforced concrete; principal stress ratio; strain rate
发表期数: 2014年8月第15期
引用格式: 曲嘉,邹广平,夏培秀. 钢纤维混凝土准静态和冲击三轴劈拉强度实验研究[J]. 中国科技论文在线精品论文,2014,7(15):1501-1507.
 
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