Lined With Three-dimensional Corrugated Steel, Reinforced Concrete Shell Theory And Numerical Simulation

A new structure, reinforced concrete shell with three-dimension ripple steel plate inward, which has been widely applied in China, is studied in this paper. Its effect of controlling the concrete's crack and crush, decreasing the structural deformation and improving the structural stability is marked. So, its prospect is bright in Chinese military shield. To provide scientific basis for its wide application in China, going on the calculation of this structure on theory and numerical modeling is necessary.Assuming that the abilities resisting tension and bending of the reinforcement bars, the three-dimension ripple steel plates and the ribs are equably distributed in the range that the ribs act on and ignoring theirs contributions to torsion, the basic differential equilibrium equations of it is derived in the 1 st chapter of this paper. The displacement of the structure under the case of distributed loads can be solved by the triangle series method. Comparing the results with those of the ordinary shell, it can be concluded that the contributions of the three-dimension ripple steel plates are notable.In the second part of this paper, from chapter 2 to chapter 6, the finite element method is used to calculate the structure under static loads and dynamic loads. Considering the material nonlinear of concrete, the elastic-plastic finite element analysis of this structure is carried out. During these courses, the eight-node shell elements are used to model the concrete and the three-dimension ripple steel plates, and the line element and film element are used to model the upper steel bar net and the single steel bar respectively. In the dynamic calculation, the harmony mass matrix and the Rayleigh damp matrix are adopted to form the dynamic formula, and Wilson_# method is applied to solve the dynamic equation. In the nonlinear analysis, the Drucker-Prager criterion is taken as the concrete's yielding criterion, and the modified Newton method is used to solve the nonlinear equations. The results of this part also show that the structural stability and bearing ability is evidently improved.