Theoretics Analysis And Computation For Ribbed Shell Structure Of 3D Ripped Steel Plate And Concrete

This paper focuses on the research of the stress mechanism of the ribbed shell structure in statics ,dynamics and under the explosive load on the basis of the engineering practice of cave depot of single aircraft .In this paper, according to the classical shell theories ,the basic differential equilibrium of the ribbed shell structure and the finite element analysis of 3D rippled plate are established ,in which the function of annular ribs reinforcement bars and 3D ripped steel plates are distributed in the range of the steel ,and the functions along the longitude direction of tension , bending ,and torsion are neglected ;Applied with dynamic analytical theory ,the dynamic model of ribbed shell structure and the analytical theory model of elastic-plastic are set up ;The triangle series method is used to solve the displacement and stress under the distributed load and the concentrated load of the ribbed shell structure . According to the theory of the finite element analysis, the matrix of mass, rigidity and damp in every part of shell structure have been fixed on; at the same time , calculation has been done in dynamics and statics. Compared with the results of the ordinary shell structure , the ribbed shell structure can improve the structural bearing capacity , so the theory of the stretching finite element analysis about statics has been extended successfully and also applied to calculation of stretching dynamics. The result indicates that the mechanics impact is of much distinctness compared with ordinary one.It also analyzed the whole stress of the ribbed shell structure under the explosive load .The analytic result keeps well with that of the dynamic response of 6.8kg TNT .It shows that this analytic method in this paper is feasible for the design and inspection of cave depot of single aircraft.in this paper at last .the localized anti-collapsing effect of the cave depot of single aircraft under the explosive load is calculated and analyzed .The explosive result shows that 3D ripped steel plate and ribbed shell structure are effective to raise the capacity of anti-collapsing of the protective structures.