强冲击荷载下RC板失效仿真研究  

Simulation Research on Failure of RC Plate Under Strong Impact Load

作　　者：梁婧 刘慧萍[1] 黄华[2] 银昱杰 LIANG Jing;LIU Hui-ping;HUANG Hua;YIN Yu-jie(School of Civil&Architecture Engineering,Xi'an Technological University,Xi'an 710021,Shaanxi,China;School of Civil Engineering,Chang an University,Xi'an 710061,Shaanxi,China)

机构地区：[1]西安工业大学建筑工程学院,陕西西安710021 [2]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2022年第3期139-145,共7页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51778060)。

摘　　要：为了更有效地模拟强冲击荷载作用下混凝土材料的失效行为,采用LS-DYNA软件,基于HJC模型,建立弹体冲击钢筋混凝土(RC)板有限元模型,研究失效类型、主应变、剪应变和应力等参数对弹体侵彻混凝土并贯穿RC板的影响规律。结果表明:当失效控制参数FS值取0或1.0~1.5时,部分模型的弹体未能贯穿RC板,与试验现象不符;当FS值为0.1~0.9时,弹体侵彻贯穿RC板后的残余速度随FS值的增大而减小,其中FS值为0.3~0.8时,模拟得到的残余速度与试验值吻合较好;在模型中添加失效准则,当主应变取0.225~0.275或剪应变取0.4~0.5时,弹体以606、746、1058 m·s^(-1)的速度冲击贯穿RC板的残余速度计算值与试验值更接近;在考虑主应变失效、剪应变失效或二者共同作用时,FS值为0.8时的模拟结果与试验结果的吻合程度较好;拉伸应力失效准则不适用于较薄RC板遭受强冲击荷载作用的情况。In order to more effectively simulate the failure behavior of concrete materials under strong impact load,using LS-DYNA software and based on HJC model,the finite element model of projectile impact reinforced concrete(RC)plate was established,and the effects of failure type,principal strain,shear strain and stress on the penetration of projectile into concrete and through RC plate were studied.The results show that when failure control parameter FS value is 0 or 1.0-1.5,the projectile body of some models fails to penetrate the RC plate,which is inconsistent with the test phenomenon.When FS value is 0.1-0.9,the residual velocity of projectile penetrating through RC plate decreases with the increase of FS value.When FS value is 0.3-0.8,the simulated residual velocity is in good agreement with the experimental value.As for adding failure criteria to the model,when the principal strain is 0.225-0.275 or the shear strain is 0.4-0.5,the calculated residual velocity of the projectile penetrating through the RC plate at the speeds of 606,746,1058 m·s^(-1) is closer to the test value.When considering the principal strain failure or shear strain failure or their combined action,the simulation results with FS value of 0.8 are in good agreement with the test.The tensile stress failure criterion is not suitable for thin RC plates subjected to strong impact load.

关 键 词：强冲击荷载 RC板 HJC模型 失效准则 残余速度 

分 类 号：TU528[建筑科学—建筑技术科学]