Research on dynamic stability of single-layer reticulated shell structures subjected to impact loads
MA Xiao-tong1,2，WANG Xiu-li1, 2
1. Lanzhou University of Technology, School of Civil Engineering, Lanzhou 730050,China；2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Tech, Lanzhou 730050,China
Abstract：Unlike seismic action，conventional dynamic stability criteria are no longer applicable for impact load.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.
马肖彤;王秀丽;. 冲击荷载作用下单层网壳结构动力稳定性研究[J]. 振动与冲击, 2015, 34(2): 119-124.
MA Xiao-tong;WANG Xiu-li;. Research on dynamic stability of single-layer reticulated shell structures subjected to impact loads. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(2): 119-124.
2015, Vol. 34 
