K8型单层球面网壳基于AUTODYN的外爆响应分析

发布时间：2018-01-07 05:13

本文关键词：K8型单层球面网壳基于AUTODYN的外爆响应分析　出处：《工程力学》2015年S1期 　论文类型：期刊论文

【摘要】：该文采用显式动力有限元软件AUTODYN对K8型单层球面网壳在外爆荷载下的动态响应进行了研究。数值模拟中采用流固耦合方法施加荷载,钢材采用多段线性模型,首先验证了AUTODYN进行近场爆炸分析和远场爆炸分析的准确性;考察了跨度为20 m的网壳结构在外爆荷载下的荷载传播规律、最大节点位移变化规律以及塑性杆件发展规律,考察了跨度为40 m网壳结构在TNT质量、炸点距离以及炸点高度参数变化下的结构响应规律。数值分析的结果表明:AUTODYN具备准确进行近场爆炸和远场爆炸分析的能力;单层球面网壳在外爆荷载下主要经历两次冲击波荷载,最大节点位移出现在第一次冲击荷载作用时,结构杆件的塑性发展在0.05 s后基本结束;网壳结构的响应随TNT质量增加和炸点高度增加而加大,随炸点距离增大而减小。
[Abstract]:In this paper, the dynamic response of K8 single-layer spherical latticed shell under external blasting load is studied by using explicit dynamic finite element software AUTODYN. The fluid-solid coupling method is applied to the numerical simulation. The multi-segment linear model is used to verify the accuracy of near-field explosion analysis and far-field explosion analysis by AUTODYN. The law of load propagation, maximum node displacement and plastic member development of latticed shell structure with span of 20 m are investigated. The TNT mass of a 40 m reticulated shell with a span of 40 m is investigated. The results of numerical analysis show that: (1) AUTODYN has the ability of accurate near-field explosion and far-field explosion analysis. The single layer spherical latticed shell mainly experiences two shock wave loads under the external blasting load. When the maximum node displacement appears in the first impact load, the plastic development of the structural members ends basically after 0.05 s. The response of reticulated shell structure increases with the increase of TNT mass and the height of explosion point, and decreases with the increase of explosion point distance.
【作者单位】：结构工程灾变与控制教育部重点实验室(哈尔滨工业大学);哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金面上项目(51278152,51378151) 爆炸冲击防灾减灾国家重点实验室课题项目(DPMEIKF201404)
【分类号】：TU399
【正文快照】： 自9·11事件以来,恐怖主义威胁越来越严重,世界各地每年都会发生大量的恐怖爆炸袭击事件,民用建筑抗爆反恐研究领域逐渐活跃。大跨空间结构作为公共建筑的一种主要选择,常常是一个地区或区域的标志性建筑,受到爆炸袭击时不仅人员和财产损失巨大,社会影响也相当显著,因而研究其

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