关键词: 相似律, 应变率效应, 重力, 单层网壳

Abstract:

Through the dimensional analysis,a comparability rule expression of single-layer reticulated shells sub- jected to a vertex impact is derived in this paper,which considers the gravity and the strain-rate effect of relevant materials.On this basis,two methods of preparing material specially and adding extra mass are proposed to meet the scaling requirements.Then,a model according well with available literaturesis constructed by using the non- linear finite element software LS-DYNA,and it is proved to be reliable by comparing the experimental results with- the simulation ones.Finally,two analytical models of Kiewitt-Lamella single-layer reticulated shells are respec- tively constructed to verify the proposed two methods by comparing their node displacements.The results show that the proposed two methods can both accurately predict the displacement of the prototype,with the relative error ab- solutes of less than 15% and 12% respectively,and they can both accurately predict the collapse modes of the pro- totype,especially the whole collapse,and that the method of adding extra mass is better in terms of precision and maneuverability.

Key words: comparability rule, strain-rate effect, gravity, single-layer reticulated shell