Joints presented in structures substantially reduce the overall rigidity and strength of structures in the joint area, also affect the explosion resistance of structures to different extents.To study the influence of joint conditions on the extent of damage to specimens,experiments to assess the resistance against surface contact explosion of spliced concrete specimens were conducted.Failure characteristics of the specimens when explosives were detonated at the joint were discussed.A finite element analysis software was used to simulate the experiments: the results thereof are in good agreement with the experimental data.The joint at a corner among three selected locations is the worst performance case under a contact explosion.The analysis reveals that the joint position has a great influence on the destructive effect of the explosion.Moreover, the width of the joints is the major factor influencing joint conditions.For shield lining structures, when the width of the joints is 2 mm, the depth of damage is maximised, which is close to 1.5 times the depth of damage at the centre of the test piece.
Key words
joint /
cratering by explosion /
contact explosion /
free surface /
numerical simulation
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
［1］ZHANG Z X.Rock fracture and blasting, theory and application［M］.New York:Elsevier Inc, 2016.
［2］Fundamental of protective design for conventional weapons:TM5-855-1［R］.［S.l.］:Waterway Experimental Station, Department of the Army, 1986.
［3］AL-HASSANI S T S, JOHNSONT W.Fracture of triangular plates due to contact explosive pressure［J］.Journal Mechanical Engineering Science,1972, 14(3):173-183.
［4］JOHN S R.Stress transients in solids［M］.Beijing: China Coal Industry Publishing House, 1981.
［5］方志威，侯海量，李典,等.破片着靶点位置对拼接的UHMWPE板抗侵彻性能影响数值研究［J］.振动与冲击, 2018, 37(21):22-28.
FANG Zhiwei, HOU Hailiang, LI Dian, et al.Numerical simulation for influences of fragment impact positions on-anti-penetration performance of UHMWPE plate［J］.Journal of Vibration and Shock, 2018, 37(21): 22-28.
［6］LI Y M,CONTESTABILE E,VON ROSEN B,et al.Explosive cratering to finite size of earth structure［J］.The 4th Asian-Pacific Symposium on Blasting Techniques.Shenzhen:APSBT,2014.
［7］A.H.哈努卡耶夫.矿岩爆破物理过程［M］.刘殿中,译.北京：冶金工业出版社, 1980.
［8］盾构法隧道施工与验收规范:GB 50446-2008［S］.北京：中国建筑工业出版社，2008.
［9］Lawrence Software Technology Corporation.LS-DYNA keyword user’s manual, version 971［R］.Livermore: Livermore Software Technology Corporation, 2007.
［10］HALLQUIST J O.LS-DYNA theory manual［R］.Livermore: Livermore Software Technology Corporation, 2006.
［11］SCHWER L E.Simplified concrete modeling with Mat_concrete_damage_rel3［Z］.JRI LS-DYNA User Week,2005.
［12］赵跃堂，寇伟晓，储程,等.管片衬砌结构在接触爆炸荷载作用下的毁伤特性分析［J］.振动与冲击, 2018, 37(11): 95-100.
ZHAO Yuetang, KOU Weixiao, CHU Cheng, et al.Damage characteristics analysis for segment lining structures under contact detonation［J］.Journal of Vibration and Shock, 2018, 37(11): 95-100.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(1678 KB)
