大空间柱面网壳结构在爆炸荷载下的动力响应  

Dynamic response of a large-space cylindrical reticulated shell under blast loading

作　　者：高轩能[1] 王书鹏[1,2] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021 [2]石家庄铁路职业技术学院,石家庄050041

出　　处：《振动与冲击》2009年第10期68-73,共6页Journal of Vibration and Shock

基　　金：福建省科技计划重点项目(2006H0030);厦门市科技计划项目(3502Z20073036)

摘　　要：通过应用LS-DYNA程序对柱面网壳结构室内爆炸的数值模拟实验,建立了大空间结构在爆炸作用下进行动力响应计算的合适模型。数值模拟计算结果与J.亨利奇公式结果吻合。通过提取结构表面有限测点的冲击波超压并将其POD分解,解决了冲击波荷载的时空差异性及结构表面压力场分布问题。采用Ritz-POD法对大空间单层柱面网壳结构在爆炸荷载下的动力响应进行了数值模拟计算,研究了结构矢跨比、结构高度、炸药TNT当量及爆炸点位置等参数变化对结构动力响应的影响。结果表明,计算模型适用于大空间结构的爆炸动力响应分析。大空间结构的最大位移和应力响应随炸药TNT当量的增加成非线性增大,应力响应成倍增大,位移响应成数倍增加。偏心爆炸冲击波比中心爆炸对大空间结构构件的损害大,对结构的边跨构件最为不利。对于应力控制设计的结构,应更注重支座附近和边跨结构的防爆能力。矢跨比大的结构防(抗)爆炸冲击波的能力较强。Using LS-DYNA and numerically simulating the explosion in a cylindrical reticulated shell,an appropriate model for calculating the dynamic responses of a large-space structure under blast loading was established and the calculations showed a good consistent with those from J.Henrych's formulae.The problems of spatiotemporal asynchrony of shock waveforms and pressure distributions on the large-space structure surface were solved by extracting the shockwave overpressure data of the finite points on structural surface and using the proper orthogonal decomposition(POD) method.Using Ritz-POD method,the numerical simulation of dynamic responses of the large-space single-layer cylindrical reticulated shell under explosion was carried out.The influence of the ratio of rise to span,the height of structure,the TNT equivalence of dynamite and the position of explosion on the dynamic responses of the shell was studied.The numerical simulation results showed that the calculation model was suitable for the dynamic response analysis of the large-space structure under explosion.The maximum displacement and stress responses of the large-space structure under blast loading quickly developed with increase in the TNT equivalence of explosive,the stress response doubled and the displacement response multiplied.The damages to the large-space structure caused by eccentric blast shock waves are more serious than those caused by central explosion and were most disadvantageous to the edge components of the structure.The more attention should be paid to the anti-explosion capacity of the support areas and the edge components for shells designed with stress control.And in general,the cylindrical reticulated shells with bigger ratios of rise to span had stronger capacity of anti-explosion.

关 键 词：大空间柱面网壳 爆炸荷载 动力响应 压力场 本征正交分解法 

分 类 号：O383.2[理学—流体力学] TU393.3[理学—力学]