冲击荷载下玄武岩纤维混凝土动态力学特性试验研究  

Experimental study on dynamic mechanical properties of basalt fiber concrete under impact load

作　　者：张永生[1,2] ZHANG Yongsheng(China Railway 15th Bureau Group Co.,Ltd.,Shanghai 200070,China;Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine,University of Science and Technology,Beijing 100083,China)

机构地区：[1]中铁十五局集团有限公司,上海200070 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《混凝土》2023年第2期25-29,共5页Concrete

基　　金：国家青年科学基金(51504016)。

摘　　要：采用Ф50 mm的分离式霍普金森压杆装置(SHPB)分别对不同纤维体积掺量(0、0.1%、02%、0.3%)的玄武岩纤维混凝土在50~200 s^(-1)应变率范围下进行了动态力学性能试验,得到了不同纤维体积掺量和不同应变率下的动态应力-应变曲线。试验结果表明,玄武岩纤维混凝土材料对应变率较为敏感,其峰值应力、DIF、峰值应变、冲击韧度都随应变率的增加呈增长趋势,但玄武岩纤维混凝土的力学性质受纤维体积掺量的影响较为复杂。试验证明玄武岩纤维的加入可进一步提高混凝土的抗压强度,同时在中高应变率下纤维的加入进一步提高了混凝土的韧性,通过对静、动态力学各性能进行,分析认为0.1%的玄武岩纤维体积掺量对各力学的提升性能最优。The dynamic mechanical properties of basalt fiber concrete with different fiber volume content(0,0.1%,02%,0.3%)were tested in the strain rate range of 50~200 s^(-1) by using aФ50 mm SHPB device.The stress-strain curves of basalt fiber concrete with different fiber content and strain rates were obtained.The experimental results show that basalt fiber concrete is a strain rate sensitive material,and it′s the peak stress,DIF,peak strain and IT increase with the increase of strain rate,but the effect of fiber volume content on mechanical properties is complicated.Basalt fiber improves the compressive strength and toughness of concrete at medium and high strain rates.Through static and dynamic mechanical properties analysis,0.1%is considered as the optimal fiber content.

关 键 词：冲击荷载 玄武岩纤维混凝土 霍普金森压杆(SHPB) 力学特性 

分 类 号：TU528.572[建筑科学—建筑技术科学]