为探究爆炸荷载作用下聚脲涂层对沉箱码头的保护作用,采用LS-DANA非线性动力分析平台,模拟在1 kg TNT当量炸药水中非接触爆炸时,不同涂覆厚度聚脲涂层的沉箱码头毁伤破坏特征。结果表明:无聚脲防护的沉箱码头毁伤破坏程度明显大于涂覆...为探究爆炸荷载作用下聚脲涂层对沉箱码头的保护作用,采用LS-DANA非线性动力分析平台,模拟在1 kg TNT当量炸药水中非接触爆炸时,不同涂覆厚度聚脲涂层的沉箱码头毁伤破坏特征。结果表明:无聚脲防护的沉箱码头毁伤破坏程度明显大于涂覆聚脲防护的沉箱码头,沉箱码头的毁伤主要集中在迎爆面外墙和迎爆侧上部管沟,随着聚脲涂层厚度的增加,沉箱码头各部分毁伤程度降低;随着涂覆聚脲厚度的增加,迎爆侧外墙位移逐渐降低,但降幅较小,区域空化效应会加大外墙上部位移;无聚脲防护的沉箱码头迎爆侧外墙位移和毁伤程度明显大于涂覆聚脲防护的沉箱码头,表明聚脲涂层对于沉箱码头具有较好的保护作用。展开更多
钢筋混凝土(RC)单向板是桥梁建设的重要组成部分.对6块高强RC单向板进行非接触爆炸试验,研究HRB400、HRB500和HTRB600高强RC单向板的抗爆性能,分析爆炸后试件的破坏形态和参数.结果表明:非接触爆炸下,3种类型高强钢筋混凝土单向板的破...钢筋混凝土(RC)单向板是桥梁建设的重要组成部分.对6块高强RC单向板进行非接触爆炸试验,研究HRB400、HRB500和HTRB600高强RC单向板的抗爆性能,分析爆炸后试件的破坏形态和参数.结果表明:非接触爆炸下,3种类型高强钢筋混凝土单向板的破坏形态相似,单向板整体响应后出现弯曲破坏,侧表面出现多条弯曲破坏裂缝;在2.5 kg TNT作用下的HTRB600高强RC单向板的裂缝数量和裂缝类型与2.1 kg TNT作用下的HRB500高强RC单向板和1.7kg TNT作用下的HRB400高强RC单向板差别不大,相差范围在1条裂缝以内;HTRB600高强RC单向板在承受更大载荷时,其平均加速度峰值比低载荷下HRB500、HRB400高强RC单向板分别增加45.1%和88.6%,其抗弯承载力更好,刚度更大.展开更多
Aiming at the estimation of personal injury attached by counter-terrorist door breaching explosive blast wave, according to the actual scene, four typical application space models of count- er-terrorist door breaching...Aiming at the estimation of personal injury attached by counter-terrorist door breaching explosive blast wave, according to the actual scene, four typical application space models of count- er-terrorist door breaching explosives are established, and numerical simulation of air-blast wave propagation by non-contact explosion counter-terrorist door breaching explosive are achieved. The research results show that the overpressure behind the target door is attenuated deeply through the burglary resistant safety door, and the propagation of blast wave and the damage effect under differ- ent space conditions are obviously different.展开更多
The ship hull is simplified as a free beam with varying sections. Based on hydroelasticity and explosion mechanics theory,mechanical model and kinetic equation for hull girder vibration under non-contact explosion are...The ship hull is simplified as a free beam with varying sections. Based on hydroelasticity and explosion mechanics theory,mechanical model and kinetic equation for hull girder vibration under non-contact explosion are established. The equation is solved by Wilson-θ algorithm. On the basis of the above principles,a structure kinetics analysis program is compiled. The dynamic response of supposed warship under air explosion is calculated conveniently and quickly. Under the explosion condition designed in the paper,the positive pressure period of non-contact explosion wave is much less than the natural periods of the first four modes of hull girder and the resonance of ship girder overall vibration can be avoided. The ratio of midship maximum moment to ultimate bearing strength under non-contact explosion accelerates with the increment of impact factor.展开更多
文摘为探究爆炸荷载作用下聚脲涂层对沉箱码头的保护作用,采用LS-DANA非线性动力分析平台,模拟在1 kg TNT当量炸药水中非接触爆炸时,不同涂覆厚度聚脲涂层的沉箱码头毁伤破坏特征。结果表明:无聚脲防护的沉箱码头毁伤破坏程度明显大于涂覆聚脲防护的沉箱码头,沉箱码头的毁伤主要集中在迎爆面外墙和迎爆侧上部管沟,随着聚脲涂层厚度的增加,沉箱码头各部分毁伤程度降低;随着涂覆聚脲厚度的增加,迎爆侧外墙位移逐渐降低,但降幅较小,区域空化效应会加大外墙上部位移;无聚脲防护的沉箱码头迎爆侧外墙位移和毁伤程度明显大于涂覆聚脲防护的沉箱码头,表明聚脲涂层对于沉箱码头具有较好的保护作用。
文摘钢筋混凝土(RC)单向板是桥梁建设的重要组成部分.对6块高强RC单向板进行非接触爆炸试验,研究HRB400、HRB500和HTRB600高强RC单向板的抗爆性能,分析爆炸后试件的破坏形态和参数.结果表明:非接触爆炸下,3种类型高强钢筋混凝土单向板的破坏形态相似,单向板整体响应后出现弯曲破坏,侧表面出现多条弯曲破坏裂缝;在2.5 kg TNT作用下的HTRB600高强RC单向板的裂缝数量和裂缝类型与2.1 kg TNT作用下的HRB500高强RC单向板和1.7kg TNT作用下的HRB400高强RC单向板差别不大,相差范围在1条裂缝以内;HTRB600高强RC单向板在承受更大载荷时,其平均加速度峰值比低载荷下HRB500、HRB400高强RC单向板分别增加45.1%和88.6%,其抗弯承载力更好,刚度更大.
基金Supported by Defense Industrial Technology Development Program(B2220110013)
文摘Aiming at the estimation of personal injury attached by counter-terrorist door breaching explosive blast wave, according to the actual scene, four typical application space models of count- er-terrorist door breaching explosives are established, and numerical simulation of air-blast wave propagation by non-contact explosion counter-terrorist door breaching explosive are achieved. The research results show that the overpressure behind the target door is attenuated deeply through the burglary resistant safety door, and the propagation of blast wave and the damage effect under differ- ent space conditions are obviously different.
文摘The ship hull is simplified as a free beam with varying sections. Based on hydroelasticity and explosion mechanics theory,mechanical model and kinetic equation for hull girder vibration under non-contact explosion are established. The equation is solved by Wilson-θ algorithm. On the basis of the above principles,a structure kinetics analysis program is compiled. The dynamic response of supposed warship under air explosion is calculated conveniently and quickly. Under the explosion condition designed in the paper,the positive pressure period of non-contact explosion wave is much less than the natural periods of the first four modes of hull girder and the resonance of ship girder overall vibration can be avoided. The ratio of midship maximum moment to ultimate bearing strength under non-contact explosion accelerates with the increment of impact factor.
