Research on dynamic stability of single-layer reticulated shell structures subjected to impact loads

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (2) : 119-124.

MA Xiao-tong1,2，WANG Xiu-li1, 2

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Abstract

Unlike seismic action，conventional dynamic stability criteria are no longer applicable for impact load. Firstly, the basic theory of solving the impact problem and value of impact load were expounded; Secondly, according to the impact load characteristics, dynamic stability criterion which is suitable for impact collision problem of single-layer reticulated shell structure is proposed. Lastly, choose a K6 single-layer reticulated shell model, dynamic stability analysis under impact is done by internationally computing dynamic nonlinear finite element software ANSYS / LS-DYNA. The whole process dynamic response under the action of different impact quality and speed is analyzed through a lot of examples. Dynamic instability critical energy region of single-layer reticulated shell under impact loads are got according to the dynamic response model; By analyzing the dynamic stability under earthquake to get instability critical load which is compared with the impact action. From the rise-span ratio, span, bar cross-section to do parameters analysis. The results show: Dynamic stability discriminant method of single-layer reticulated shell structures which combining the dynamic response model and impact energy is reasonable; The smaller the structure stiffness, the worse the dynamic stability under impact load; Increase the main bar section is most conducive to improving the structure dynamic stability.

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impact load / dynamic stability / discriminant criterion / parametric analysis

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MA Xiao-tong;WANG Xiu-li;. Research on dynamic stability of single-layer reticulated shell structures subjected to impact loads[J]. Journal of Vibration and Shock, 2015, 34(2): 119-124