考虑重力效应的单层球面网壳抗冲击荷载性能
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摘要
为研究冲击荷载作用下网壳结构的动力响应,应用有限元软件ANSYS/LS-DYNA建立60m跨度K8型单层球面网壳的冲击模型并进行数值分析,计算对比是否考虑重力效应两种情况下,网壳在冲击荷载作用下的动力响应.得出产生差异的主要原因:网壳结构的自重敏感性、离心力效应与几何大变形.由此得出结论:只有考虑重力效应,即冲击荷载与重力荷载同步施加到结构时,所得的动力响应才是准确的.在上述基础上,对135个K8型网壳算例进行分析,研究表明:网壳竖向变形和主要杆件受力随着冲击质量与速度的增加而增大,当质量与速度增加到一定值后,二者均不再变化.
To investigate the dynamic response of reticulated domes under impact load,a model of KIEWITT8 single-layer reticulated dome with span of 60 m was established and simulated by ANSYS/LS-DYNA. The dynamic response of dome under impact load was calculated and compared with or without the consideration of gravity. Results show that gravity sensitivity,effect of centrifugal load,large displacement of geometry all cause the difference between the two situations. Moreover,the exact dynamic response can not be obtained without the consideration of gravity. Moreover,the analysis on 135 examples indicates that the vertical displacement and stress of main elements increase with the increasing impact mass or impact velocity,but they do not change after increasing the impact mass or impact velocity to a certain degree.
To investigate the dynamic response of reticulated domes under impact load,a model of KIEWITT8 single-layer reticulated dome with span of 60 m was established and simulated by ANSYS/LS-DYNA. The dynamic response of dome under impact load was calculated and compared with or without the consideration of gravity. Results show that gravity sensitivity,effect of centrifugal load,large displacement of geometry all cause the difference between the two situations. Moreover,the exact dynamic response can not be obtained without the consideration of gravity. Moreover,the analysis on 135 examples indicates that the vertical displacement and stress of main elements increase with the increasing impact mass or impact velocity,but they do not change after increasing the impact mass or impact velocity to a certain degree.
引文
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[2]SCHMIDTJ A,ASCE P E M.Simplified Structural A-nalysis and Design for External Terrorist Bomb Attacks,C E World,Presentation,Structures[EB/OL].http://www.ceworld.org/ceworld/Presentations/Structures,2002.
[3]Samuel Tan.Cable-based retrofit of steel building floors to prevent progressive collapse[D].Berkeley:University of California in Berkeley,2003.
[4]熊明祥,钢框架组合结构的冲击响应和防护措施研究[D].武汉:华中科技大学,2005.
[5]陆新征,江见鲸.世界贸易中心飞机撞击后倒塌过程的仿真分析[J].土木工程学报,2001,34(6)8-10.
[6]赵振东,钟江荣,余世舟.钢混结构物受外来飞射体撞击的破坏效应研究[J].地震工程与工程振动,2003,23(5):89-94.
[7]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.
[8]史俊亮,K8型单层网壳在撞击荷载作用下的动力响应研究[D].太原:太原理工大学,2005.
[9]李海旺,郭可,魏剑伟,等.撞击载荷作用下单层球面网壳动力响应模型实验研究[J].爆炸与冲击,2006,26(1)39-45.
[10]KARAGIOZOVA D,MarcIlio Alves.Transition from progressive buckling to global bending of circular shells under axial impact—Part I:Experimental and numeri-cal observations[J].International Journal of Solids and Structures,2004,41:1565-1580.
[11]KARAGIOZOVA D,MarcIlio Alves.Transition from progressive buckling to global bending of circular shells under axial impact—Part II Theoretical analysis[J].International Journal of Solids and Structures,2004,41:1581-1604.
[12]安世亚太北京有限公司.ANSYS/LS-DYNA使用指南[M].北京:安世亚太有限公司,1999.
[13]沈祖炎,陈扬骥.网架与网壳[M].上海:同济大学出版社.1997.
[14]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.
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