单层网壳结构冲击响应模式及临界冲击动能研究

发布时间：2018-03-11 06:53

本文选题：冲击荷载　切入点：单层球面网壳　出处：《工程力学》2015年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The finite element model of K-6 single-layer spherical latticed shell with 60m span is established by ANSYS/LS-DYNA. Through the analysis of a large number of parameters, four shock response modes of K-6 reticulated shell and their variation laws are obtained, and the yield strength of the material is considered. The effects of elastic modulus and bar cross-sectional area on the shock response mode and its distribution of latticed shells are studied. The critical impact kinetic energy of the latticed shells is extracted when the local collapse and the whole collapse occur under the impact action. The effects of material characteristics and cross-section characteristics on the impact resistance of latticed shells are compared, and the formulas for calculating critical impact kinetic energy are fitted. The results show that the shock response mode of K6 latticed shell changes regularly with the kinetic energy of the impact. In the cross section characteristic and material characteristic of the member, the impact response mode of the shell is compared with that of the finite element method. The cross section area of the member has a great influence on the impact resistance of the reticulated shell. The critical impact kinetic energy of latticed shells can be calculated by using the formula, which is of practical significance for the design of latticed shell structures.
【作者单位】：兰州理工大学土木工程学院;清华大学土木工程系;
【基金】：国家自然科学基金项目(51278236) 国家科技支撑计划项目(2011BAK12B07)
【分类号】：TU311.3;TU399

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