冲击荷载下单层网壳结构的整体倒塌分析
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摘要
对60m跨度的K6型单层球面网壳建模,利用ANSYS/LS-DYNA对其在不同质量及速度冲击物作用下的动力响应进行大量参数化分析。提取了关键节点的位移时程曲线,针对损伤最严重的整体倒塌模式进行了研究。得出了网壳结构在冲击荷载作用下出现整体倒塌现象与冲击物动能及节点位移的关系以及冲击过程动能传递率的分布规律。研究结果表明,冲击物质量越大,使K6网壳发生倒塌所需动能越少;当冲击物作用使关键节点的竖向位移值大于临界位移值时,网壳结构会发生倒塌现象;当冲击物携带动能为临界倒塌冲击动能时,冲击过程的动能传递率最大。
A model for the Kiewitt6single-layer reticulated shell with a span of 60 mwas established and ANSYS/LS-DYNA was adopted to analyze the parameters of the dynamic response to impact of different masses and velocities.The concepts of critical impact kinetic energy and kinetic energy transmissibility were introduced and the displacement time-history curve of the key node was obtained to study the overall collapse mode.The kinetic energy transmissibility and relation between impact kinetic energy and the displacement of nodes during the overall collapse of the reticulated shell under impact load was studied.The results showed that the more the impact weight was,the less the kinetic energy was needed for the collapse of the Kiewitt6single-layer reticulated shell,the reticulated shell collapsed when the vertical displacement of the key node under impact exceeded the critical displacement,and when the impact kinetic energy equaled the critical collapse kinetic energy,the transmissibility of kinetic energy maximized in the course of impact.
A model for the Kiewitt6single-layer reticulated shell with a span of 60 mwas established and ANSYS/LS-DYNA was adopted to analyze the parameters of the dynamic response to impact of different masses and velocities.The concepts of critical impact kinetic energy and kinetic energy transmissibility were introduced and the displacement time-history curve of the key node was obtained to study the overall collapse mode.The kinetic energy transmissibility and relation between impact kinetic energy and the displacement of nodes during the overall collapse of the reticulated shell under impact load was studied.The results showed that the more the impact weight was,the less the kinetic energy was needed for the collapse of the Kiewitt6single-layer reticulated shell,the reticulated shell collapsed when the vertical displacement of the key node under impact exceeded the critical displacement,and when the impact kinetic energy equaled the critical collapse kinetic energy,the transmissibility of kinetic energy maximized in the course of impact.
引文
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[3]刘锋,吕西林.冲击载荷作用下框架结构的非线性动力响应[J].振动工程学报,2008,22(2):107-114.
[4]陆新征,江见鲸.世界贸易中心飞机冲击后倒塌过程的仿真分析[J].土木工程学报,2001,48(6):8-10.
[5]赵振东,钟江荣,余世舟.钢混结构物受外来飞射体冲击的破坏效应研究[J].地震工程与工程振动,2003,23(5):89-94.
[6]张峰峰.钢框架在冲击荷载作用下的响应分析[D].大连:大连理工大学,2010.
[7]吴昊,方秦,龚自明,等.冲击爆炸作用对核电站安全壳毁伤效应研究的进展[J].防灾减灾工程学报,2012,32(3):384-392.
[8]王多智,范峰,支旭东,等.考虑重力效应的单层球面网壳抗冲击荷载性能[J].哈尔滨工业大学学报,2009,41(8):19-23.
[9]王多智,支旭东,范峰,等.冲击荷载下K8单层球面网壳的破坏类型[J].工程力学,2008,25(S2):144-149.
[10]范峰,王多智,支旭东,等.K8型单层球面网壳抗冲击荷载性能研究[J].工程力学,2009,26(6):75-81.
[11]王多智,范峰,支旭东,等.冲击荷载下单层凯威特型球面网壳防护方法及建议[J].振动与冲击,2012,31(8):136-142.
[12]王多智.冲击荷载下网壳结构的失效机理研究[D].哈尔滨:哈尔滨工业大学,2010.
[13]郭可.单层球面网壳在冲击荷载作用下的动力响应分析[D].太原:太原理工大学,2004.
[14]史俊亮.K8型单层网壳在冲击荷载作用下的动力响应研究[D].太原:太原理工大学,2005.
[15]王礼立,余同希,李永池.冲击动力学进展[M].合肥:中国科学技术大学出版社,1992.
[16]Karagiozova D,Marcilio A.Transition from Progressive Buckling to Global Bending of Circular Shells under Axial Impact-PartⅠ:Expperimental and Numerical Observations[J].International Journal of Solids and Structures,2004,41:1 565-1 580.
[17]Karagiozova D,Marcilio A.Transition from Progressive Buckling to Global Bending of Circular Shells under Axial ImpactPartⅡ:Theoretical Analysis[J].International Journal of Solids and Structures,2004,41:1 581-1 604.
[18]余同希,邱信明.冲击动力学[M].北京:清华大学出版社,2011.
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