钢纤维高强混凝土板抗爆细观数值模拟及实验研究  

Mesoscale Numerical Simulation and Experimental Study on Anti-explosion Steel Fiber Reinforced Concrete Slab

作　　者：蔡路军[1,3] 刘令 陈少杰 吴立过 许凯 CAI Lu-jun;LIU Ling;CHEN Shao-jie;WU Li-guo;XU Kai(College of Science,Wuhan University of Science and Technology,Wuhan 430065,China;School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Engineering Technology Research Center in Intelligent Blasting of Hubei Province,Wuhan 430065,China)

机构地区：[1]武汉科技大学理学院,武汉430065 [2]武汉科技大学城市建设学院,武汉430065 [3]湖北省智能爆破工程技术研究中心,武汉430065

出　　处：《爆破》2020年第4期145-154,共10页Blasting

基　　金：国家自然科学基金(51574184);湖北省教育厅科学研究计划重点项目(D20151105)。

摘　　要：基于纤维随机分布特征,对钢纤维交叉判重做出改进,设计出一种不交叉重叠的随机投放方法,借助MATLAB和ANSYS/LS-DYNA联合建立包含钢纤维、钢筋和混凝土的三维细观数值模型,通过纤维体积含量为0.6%、1.2%和1.8%SFRC板接触爆炸实验验证了细观有限元模型的正确性和有效性,从实验和数值模拟两方面对钢纤维高强混凝土板抗爆进行了研究。进一步分析长径比和板厚变化对结构抗爆性能的影响,结果表明:所建立的钢纤维高强混凝土细观数值模型较好地反映结构在承受爆炸超动态荷载作用时的损伤破坏行为,随着纤维体积含量的增加,SFRC板局部抗震塌效应显著增强,且纤维体积含量和爆炸形式相同条件下,结构整体抗爆性能随着长径比和板厚度的增加而增大,损伤程度逐渐减小,各工况迎爆面漏斗坑体积变化微小,但背部剥落坑体积减小较明显,研究表明纤维体积含量为1.8%、长径比为60、板厚为11cm时,结构抗爆性能较优。Based on the random distribution characteristics of fibers,the cross-weighting of steel fibers was improved,and a non-overlapping random delivery method was designed.Besides,a three-dimensional mesoscale model containing steel fibers,steel bars,and concrete was established by MATLAB and ANSYS/LS-DYNA.Meanwhile,the correctness and validity of the mesoscopic finite element model was verified by the SFRC explosion experiments as the fiber volume contents is 0.6%,1.2% and 1.8% respectively.Furthermore,the effect of different length-diameter ratios and thicknesses of the slab on the performance of the anti-blast structures was studied.The results show that the established model of the steel fiber reinforced concrete can reflect the structure damage and destruction behavior well when it withstands the super dynamic load from the explosion.With the increase of the fiber volume content,the local anti-seismic collapse effect of the SFRC slab is significantly enhanced.Under the same conditions of fiber volume content and explosion form,the overall anti-explosion performance of the structure increases with the increase of the length-diameter ratio and the thickness of the slab,and with the decrease of the damage degree.The volume of blasting crater on the blast-receiving surface is little changed.However,the crater on the back of the blasting surface is decreased obviously.Finally,the anti-blast performance of the structure is optimized with the volume content of 1.8%,the length-diameter ratio of 60,and the slab thickness of 11 cm.

关 键 词：钢纤维高强混凝土板 细观数值模型 接触爆炸 纤维体积含量 长径比 

分 类 号：TU375.02[建筑科学—结构工程]