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爆炸冲击荷载下土中平封头圆柱壳动力屈曲研究

DOI: 10.11858/gywlxb.2013.05.008, PP. 704-710

Keywords: 爆炸荷载,土中平封头圆柱壳,动力屈曲,临界屈曲荷载

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Abstract:

爆炸冲击荷载下土埋储油设施的动力响应研究是涉及公共结构设施安全的重要课题。以平封头圆柱壳结构模拟储油罐,根据土中圆柱壳的受力特征,利用修正的Winkler模型对圆柱壳-土相互作用进行描述,并给出确定模型参数的方法。基于在爆炸压力模拟器内进行的土埋钢质圆柱壳模型的爆炸压力加载实验,确定了壳壁周边荷载分布的合理简化模型。进而对平封头圆柱壳结构的动力屈曲问题进行了有限元数值计算,并根据Budiansky-Roth准则确定了临界屈曲荷载。通过对多工况下数值计算结果的分析,给出了临界屈曲荷载与土体弹性常数K的关系。

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