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工程力学  2015 

单层网壳结构冲击响应模式及临界冲击动能研究

DOI: 10.6052/j.issn.1000-4750.2013.12.1125, PP. 81-87

Keywords: 冲击荷载,单层球面网壳,有限元分析,冲击响应模式,临界冲击动能

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Abstract:

采用ANSYS/LS-DYNA对60m跨度的K-6型单层球面网壳建立有限元模型,通过大量参数分析得出K-6网壳的4种冲击响应模式及其变化规律,考虑材料屈服强度、弹性模量及杆件截面积对网壳冲击响应模式及其分布规律的影响,提取网壳在冲击作用下发生局部倒塌和整体倒塌时的临界冲击动能,比较材料特性及截面特性对网壳抗冲击性能的影响,拟合了临界冲击动能的计算公式,并与有限元结果进行了对比。结果表明,K6网壳的冲击响应模式随冲击物携带动能的改变呈规律性变化。在杆件的截面特性和材料特性中,杆件的截面积对网壳的抗冲击性能影响较大,提高杆件的截面积可以大幅度提高网壳抵抗冲击荷载的能力。网壳的临界冲击动能可以利用公式进行计算。该结果对于网壳结构的抗冲击设计具有实际意义。

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