基于杆件破坏形式的冲击荷载下单层球面网壳失效机理分析
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摘要
应用有限元软件ANSYS LS/DYNA建立60m跨度K8型单层球面网壳与圆柱形冲击物的模型并进行数值分析,得到网壳竖向变形、主要杆件受力及塑性发展三方面的结构动力响应。归纳出顶点竖向冲击荷载下网壳结构的四种失效模式:杆件损伤,杆件破坏,局部凹陷,整体凹陷。通过考察网壳杆件受力与破坏形式,得出杆件按时间顺序可能出现的三种受力状态:剪切、弯曲、拉伸,以及四种破坏形式:剪切、弯曲、拉弯、拉伸。研究发现:破坏的杆件起到将冲击物的能量传递给网壳主体的重要作用,杆件破坏形式预示其传递能量的能力,而传递的能量是决定的网壳动力响应的主要因素,更重要的是网壳的失效模式是依据最大动力响应定义的。由此,以能量传递为媒介,建立了杆件破坏形式与网壳失效模式间的对应关系。
Four failure modes of a reticulated dome including member slight damage failure,member broken failure,local dent failure and global dent failure were generalized according to its dynamic response,when a single-layer reticulated dome was subjected to vertical impact load on its apex.And failure members were all in impact zone.Dynamic response of failure members was given out.Then,there were three states of load before failure of members: shear,bending and tension appeared in time order.Besides,four failure types of members were put forward basing state history before failure: shear,bending,bending and tension as well as tension.Based on analysis of energy transfer,the relationship among failure types of members,failure modes of reticulated dome and energy transferring were put forward: failure modes of reticulated dome were decided by the maximum dynamic response;then,the maximum dynamic response was decided mainly by the energy in the outer zone of reticulated dome;the ability of transferring energy could be judged by failure types of members in impact zone.
Four failure modes of a reticulated dome including member slight damage failure,member broken failure,local dent failure and global dent failure were generalized according to its dynamic response,when a single-layer reticulated dome was subjected to vertical impact load on its apex.And failure members were all in impact zone.Dynamic response of failure members was given out.Then,there were three states of load before failure of members: shear,bending and tension appeared in time order.Besides,four failure types of members were put forward basing state history before failure: shear,bending,bending and tension as well as tension.Based on analysis of energy transfer,the relationship among failure types of members,failure modes of reticulated dome and energy transferring were put forward: failure modes of reticulated dome were decided by the maximum dynamic response;then,the maximum dynamic response was decided mainly by the energy in the outer zone of reticulated dome;the ability of transferring energy could be judged by failure types of members in impact zone.
引文
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[16]WANG Duozhi,ZHI Xudong,FAN Feng,et al.Failureprocess and energy transmission for single-layer reticulateddomes under impact loads[J].Transactions of Tianjin Uni-versity,2008,14(1):551-557.
[2]Schmidt J A,Asce P E M.Simplified Structural Analysis andDesign for External Terrorist Bomb Attacks,CE World,Pres-entation,Structures[EB/OL].http://www.ceworld.org/ceworld/Presentations/Structures,2002.
[3]Samuel Tan.Cable-based retrofit of steel building floors toprevent progressive collapse.Master paper of University ofCalifornia 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]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,2008,21(2):107-114.
[6]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,2001,34(6):8-10.
[7]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.
[8]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.
[9]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.
[10]李海旺,郭可,魏剑伟,等.冲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.
[11]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.
[12]ANSYS/LS-DYNA使用指南.安世亚太.
[13]Karagiozova D,Alves M.Transition from progressive buck-ling to global bending of circular shells under axial impact—Part I:Experimental and numerical observations[J].Inter-national Journal of Solids and Structures,2004,41(5-6):1565-1580.
[14]Karagiozova D,Alves M.Transition from progressive buck-ling to global bending of circular shells under axial impact—Part II Theoretical analysis[J].International Journal of Sol-ids and Structures,2004,41(5-6):1581-1604.
[15]FAN Feng,WANG Duozhi,ZHI Xudong,et al.Failuremodes for single-layer reticulated domes under impact loads[J].Transactions of Tianjin University,2008,14(1):545-550.
[16]WANG Duozhi,ZHI Xudong,FAN Feng,et al.Failureprocess and energy transmission for single-layer reticulateddomes under impact loads[J].Transactions of Tianjin Uni-versity,2008,14(1):551-557.
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