钢纤维混凝土冲击压缩力学性能研究  

A Study on the Mechanical Properties of Steel Fiber Concrete under Impact Compression

作　　者：郭国强 李良松 钟雷[1,2] GUO Guoqiang;LI Liangsong;ZHONG Lei(Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang Hubei 443002;College of Civil Engineering and Architecture,China Three Gorges University,Yichang Hubei 443002;Ganxi Vocational College of Science and Technology,Xinyu Jiangxi 338000;Sponge City Research Institute,Pingxiang University,Pingxiang Jiangxi 337000,China)

机构地区：[1]防灾减灾湖北省重点实验室(三峡大学) [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]赣西科技职业学院,江西新余338000 [4]萍乡学院海绵城市研究院,江西萍乡337000

出　　处：《萍乡学院学报》2023年第6期17-23,共7页Journal of Pingxiang University

基　　金：江西省科技计划项目“基于机器学习的海绵城市洪淓防控和LID综合效益研究”(PY2023009)。

摘　　要：基于钢纤维随机生成算法和HJC本构模型生成了满足钢纤维体积率及几何特征要求的钢纤维混凝土细观数值模型,课题组研究了应变速率、钢纤维含量等因素对钢纤维混凝土在不同围压作用下冲击压缩力学性能的影响。结果表明:在钢纤维含量及钢纤维长径比相同的条件下,随着应变速率的提高,钢纤维混凝土的峰值应力和峰值应变均有不同程度的增大;随着围压的增大,钢纤维混凝土的冲击压缩强度及抵抗变形的能力显著增强;在有围压状态下,钢纤维混凝土冲击压缩强度的率效应受到抑制,围压越大,钢纤维混凝土冲击压缩强度的率效应的抑制效果越强。A mesoscopic numerical model of steel fiber reinforced concrete,which meets the requirements of steel fiber volume fraction and geometric characteristics,was generated based on the random generation algorithm of steel fibers and the Holmquist Johnson Cook(HJC)constitutive model.The influence of factors such as strain rate and steel fiber reinforced content on the impact compression mechanical properties of the steel fiber reinforced concrete under different confining pressures was studied.The results showed that when both the steel fiber content and steel fiber aspect ratio were being equal,the peak stress and peak strain of steel fiber reinforced concrete increased to varying degrees with the rising of strain rate;With the increase of confining pressure,the impact compressive strength and resistance to deformation were significantly enhanced.Under the confining pressure,the rate effect was restrained.The larger the confining pressure,the stronger the restraint effect was.

关 键 词：钢纤维混凝土 冲击压缩 力学性能 破坏模式 围压 

分 类 号：TN99[电子电信—信号与信息处理]