利用数值模拟技术研究了地面爆炸冲击波与双曲线型壳体结构相互作用的模拟方法及作用于结构表面上爆炸荷载的预测方法。采用多物质欧拉与拉格朗日耦合算法,建立了不同比例距离下TNT炸药-结构耦合模型。通过参数分析,研究了结构表面爆炸荷载超压峰值沿环向和高度的分布规律,以及基本点反射超压峰值放大系数,并给出了拟合函数表达式。结果表明,结构背面(0°~90°区域)荷载超压峰值相比正面的超压峰值很小,在分析结构动力响应时可以忽略不计。荷载超压峰值沿环向及高度的分布与比例距离关系不明显,除环向局部分布需要用波形函数拟合外,其余部分均可以用线性函数拟合。基本点反射超压峰值放大系数与比例距离呈指数关系。结合已有的研究结论,建议了双曲线型壳体结构爆炸冲击荷载模型。
Abstract
Numerical simulation of blast wave propagation and its interaction with hyperbolic shell structures are studied. And the method for predicting blast loads on the structure is proposed. Using the multi-material Eulerian and Lagrangian coupling algorithm, several models considering fluid-structure interaction with different scaled distance are established. Parametric studies are conducted to investigate the peak overpressure distribution of blast loading along the height and the circumference of the structure, the reflected peak overpressure amplification factor of basic point are also investigated. Fitting functions are derived. The results show that reflected peak overpressure in back of the structure (region ranged from 0 degrees to 90 degrees) is so small that it is negligible in the analysis of structural dynamic response, compared to that in front of the structure. The peak overpressure along the circumference and height of the structure has little impact on the scaled distance. Except that the local circumferential distribution need to be fitted with wave function, the remaining part can be fitted with a liner function. The reflected peak overpressure amplification factor of basic point has exponential relationship with scaled distance. Based on the research results, a blast load model for hyperbolic shell structures is proposed.
关键词
双曲线型壳体结构 /
数值模拟 /
地面爆炸 /
荷载分布 /
爆炸荷载模型
{{custom_keyword}} /
Key words
Hyperbolic shell structures /
Numerical simulation /
Surface explosion /
Loading distribution /
Blast load model
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] Wu C.,Hao H.Modelling of simultaneous ground shock and air blast pressure on nearby structures from surface explosions[J].International Journal of Impacting Engineering , 2005,31:699-717.
[2] 师燕超. 爆炸荷载作用下钢筋混凝土结构的动态响应行为与损伤破坏机理[D].天津:天津大学,2009.
Shi Yan-chao. Dynamic Response and Damage Mechanism of Reinforced Concrete Structures under Blast Loading[D].Tianjin: TianjinUniversity,2009.
[3] 穆朝民,任辉启,李永池 等. 爆炸冲击波作用于墙体及对墙体绕射的实验研究[J].实验力学,2008,23(2):169-174.
Mu Chao-min,Ren Hui-qi,Li Yong-chi et al. Experimental Study of Blast Wave Reflection and Diffraction on a Shelter Wall[J]. Journal of Experimental Mechanics,2008,23(2):169-174
[4] 穆朝民,任辉启,李永池 等. 爆炸冲击波对墙体绕射效应的研究[J].力学与实践, 2009, 31(5):35-40.
Mu Chao-min,Ren Hui-qi,Li Yong-chi et al.Research into Impact Effect on Wall and Flow Around Wall of Explosive Shock Wave[J].Mechanics in Engineering,2009,31(5):35-40.
[5] 高轩能,王书鹏,江媛. 爆炸荷载下大空间结构的冲击波压力场分布及泄爆措施研究[J].工程力学,2010,27(4):226-233.
Gao Xuan-neng,Wang Shu-peng,Jiang Yuan.Shock Wave Pressure Distribution on Large-Space Structures and Explosion Venting Under Blast Loading[J]. Engineering Mechanics 2010,27 (4):226-233.
[6] 张秀华,段忠东,张春巍. 近地空中爆炸作用下钢框架结构冲击响应[J].地震工程与工程振动,2009,29(4):70-76.
Zhang Xiuhua,Duan Zhongdong,Zhang Chunwei.Shock responses of steel frame structure near the ground explosion[J].Journal Of Earthquake Engneering And Engneering Vibration, 2009,29(4):70-76.
[7] 王震,胡可,赵阳.拱顶钢储罐内部蒸气云爆炸冲击荷载的数值模拟[J].振动与冲击,2013,32(20):35-40.
WANG Zhen,HU Ke,ZHAO Yang.Numerical simulationg of internal vapor cloud explosion loading in dome-roof steel tanks[J]. Journal of Vibration and Shock,2013,32(20):35-40.
[8] 胡可,赵阳,王震.锥顶钢储罐内部可燃气体爆炸冲击荷载的CFD模拟[J].振动与冲击,2015,34(12):150-156.
HU Ke,ZHAO Yang,WANG Zhen.CFD simulation of internal flammable gas explosion loading in cone-roof steel tanks[J].Journal of Vibration and Shock,2015,34(12):150-156.
[9] LS-DYNA keyword user’s manual [Z].Version 971 LSTC,2005.
[10] O’Daniel J L,Krauthammer T.Assessment of numerical simulation capabilities for medium-structure interaction systems under explosive loads[J].Computers and Structures,1997,63(5): 875-887.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}