摘要
为研究双装药同步爆炸载荷对钢筋混凝土梁的毁伤效应,开展了钢筋混凝土梁双装药同步爆炸试验,得到了混凝土梁的破坏特征和位移响应。基于试验结果,利用有限元仿真软件建立了相应的钢筋混凝土梁双装药同步爆炸仿真模型,考虑了简支边界条件的影响。通过对比混凝土梁的局部破坏特征以及最大位移响应,验证了仿真模型的可靠性。基于此,进一步研究双装药同步爆炸时装药间距和炸高对混凝土梁破坏特征和位移响应的影响。此外,对比相同炸高下双装药和总质量相同的单个装药对混凝土梁的毁伤效应。研究结果表明:随着装药间距的增大,混凝土梁的破坏模式由局部破坏逐渐变为冲切破坏。由于双装药同步爆炸冲击波叠加增强效应的影响,混凝土梁位移响应和迎爆面破坏范围随着装药间距的增加呈现先增大、后减小的变化趋势。对于破坏模式,双装药作用下混凝土梁的局部破坏比等质量单装药作用时更加均匀,破坏范围更大,尤其是对迎爆面的破坏;对于位移响应,存在一个关于装药间距的区间范围,在该范围内双装药作用下混凝土梁的位移响应大于等质量单装药作用下混凝土梁的位移响应:炸高越小,该区间范围越大,装药质量越大,该区间范围越大。
To study the damage effect of synchronous explosive loading of double charges on reinforced concrete(RC) beams,the experiments were conducted on RC beams subjected to the synchronous explosive loading of double charges.The damage characteristics and displacement response of RC beams were obtained through the experiments.Based on the experimental results,a corresponding RC beam synchronous explosion simulation model with double charges is established using finite element simulation software,considering the influence of simply supported boundary conditions.The reliability of the simulation model is verified by comparing the local failure characteristics and maximum displacement responses of RC beams from experiments and simulation.Based on this,the effects of charge spacing and blast height on the failure characteristics and displacement of concrete beams during synchronous explosion of double charges are further studied.In addition,the damage effects of double charges and equivalent single charges on the concrete beams at the same blast height are compared.The results show that the failure mode of concrete beams gradually changes from local failure to punching shear failure with the increase of charge spacing.As the charge spacing increases,the displacement response and front surface failure of concrete beam shows a trend of first increasing and then decreasing,mainly due to the enhancement effect of shock wave superposition during synchronous explosions of two charges.Besides,compared to the destructive effect of a single charge with the same total mass on concrete beams,the local damage of RC beams under the action of double charges is more uniform.Moreover,there exists a range of intervals related to charge spacing,within which the displacement response of RC beams under double charges is greater than that under equal mass single charge:the smaller the blast height,the larger the range of this interval;The larger the charge mass,the larger the range of this interval.
作者
许迎亮
刘彦
闫俊伯
白帆
于浩
李旭
王虹富
XU Yingliang;LIU Yan;YAN Junbo;BAI Fan;YU Hao;LI Xu;WANG Hongfu(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China;China Research and Development Academy of Machinery Equipment,Beijing 100089,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第12期3719-3732,共14页
Acta Armamentarii
基金
国家自然科学基金项目(11521062)。
关键词
双装药
同步爆炸
混凝土梁
叠加冲击波
装药间距
毁伤范围
double charges
synchronous explosion
RC beams
superimposed shock wave
charge spacing
damage range
