平面管桁架柱在汽车冲击作用下的动力响应及失效模式研究

发布时间：2018-01-14 18:36

本文关键词：平面管桁架柱在汽车冲击作用下的动力响应及失效模式研究　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着国家钢材产量的增加和建筑使用要求的不断提高,钢结构越来越多地应用于建筑结构中。而桁架柱因用料经济、自重较小,结构线型优美、造型多样等优点,被广泛应用在会展中心、体育场馆、工业厂房等结构中。虽然汽车冲击荷载属于偶然荷载,理论上发生的概率很小,但是近年来随着国民生活水平的提高,汽车保有量的逐年增加,汽车冲击建筑物事件发生的概率不断增加。目前国内外对汽车冲击荷载的研究多集中于桥梁方向,对于建筑结构的相关研究很少。基于以上问题,本文提出了管桁架柱在汽车冲击荷载作用下的冲击响应分析方法,对管桁架柱受汽车冲击时的失效模式及失效规律展开了深入的研究,具体内容如下:1、在ANSYS/LS-DYNA中建立了汽车冲击平面管桁架柱的有限元模型,研究了汽车冲击荷载作用下管桁架柱冲击响应的分析方法,确定了管桁架柱的冲击响应特征指标,包括管桁架柱的特征响应和冲击荷载时程曲线。2、根据汽车模型冲击作用下管桁架柱的失效特点,定义了管桁架柱的三种失效模式,分析了相应失效模式的冲击响应特征。并详细分析了汽车冲击管桁架柱的全过程,从能量的角度揭示了三种失效模式的失效机理。最后分析了汽车和桁架柱的参数对失效模式规律的影响。3、对比两种汽车模型下管桁架柱的失效规律,发现刚体汽车模型作用下管桁架柱的破坏较为严重,冲击荷载也较大。再将两者结果与规范相比较,得到欧洲和中国规范规定的冲击荷载偏小,美国规范更具参考价值的结论。
[Abstract]:With the increase of steel production countries and architectural requirements continue to increase, the steel structure is more and more used in building structures. And the truss column due to the economic materials, small self weight, linear structure is exquisite, modelling diversity and other advantages, is widely used in the exhibition centers, stadiums, industrial plants and other structures. Although the vehicle impact load belong to accidental load, happened on the theory of probability is very small, but in recent years, with the improvement of the living standard, car ownership has increased year by year, the probability of vehicle impact event building is increasing. The current domestic and foreign research on car impact load are more concentrated in the direction of the bridge, for little related research building structure based on the above. The problem, this paper presents a calculating method of response of pipe truss column in automobile under impact load impact on failure mode of pipe truss columns subjected to shock and loss of car Effect of in-depth research, the specific contents are as follows: 1, in ANSYS/LS-DYNA the finite element impact plane pipe truss column model, analysis of pipe truss column impact response of the vehicle under the shock load, the tube truss column impact response characteristics, including the characteristics of response and shock load of tube the truss column curve of.2, according to the characteristics of impact failure model of automobile tube truss column, defines three kinds of failure modes of pipe truss column, analyzed the failure modes of the shock response characteristics. The whole process and a detailed analysis of the automobile shock tube truss column, three failure modes of the failure mechanism was revealed from the angle of energy. The final analysis of the parameters of automobile and truss column effect on failure mode of.3, the failure regularity of pipe truss column comparing the two kinds of car model, found that the rigid body model cars effect The failure of the lower trussed truss column is more serious and the impact load is larger. Comparing the two results with the specifications, we get the conclusion that the impact load specified by the European and Chinese regulations is too small, and the American standard is more valuable.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391

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