Finite Element Analysis And Optimum Design Of Double Deck Reticulated Shell Structure Support Abutment

Double layer spherical reticulated shell is a kind of space structure,which is used more and more in the form of a space structure,Because of the beautiful shape,convenient construction,economic benefits,and the overall stiffness of the advantages,double layer spherical reticulated shell is favored by domestic and foreign engineering personnel.At present,the domestic and foreign scholars on the structure of the grid structure is relatively more attention,the research results are relatively mature,but the research on the structure and support of the lower part of the hyperbolic reticulated shell is relatively insufficient.This paper mainly carried out the following research:The large general finite element analysis software is used to analyze the structure of the double layer reticulated shell and its supporting frame under the actual load condition.The change of mechanical properties of double layer spherical reticulated shell is studied by sliding hinge support,flexible hinge support and fixed hinge support.Modeling of the supporting frame structure of the shell structure,one is the overall structure modeling with ring beam,the other one is modeling independent concrete columns without beam.To study the change of lateral displacement rigidity of concrete columns under the two conditions by the methods of theoretical analysis and numerical calculation,quantitative analysis of the influence on the level of concrete beam column stiffnessStudy on the effect of the mechanical properties of the double layer reticulated shell and the change of the stress in the bar in supporting frame structures under different conditions of settlement.Research on the failure mechanism of the structure of the shell and the way to exit the bar after the settlement of the lower supporting conditions.It is concluded that the structure of double layer spherical reticulated shell is more favorable to the shell structure with elastic hinge support than the sliding hinge support and fixed hinge support.The support stiffness of the elastic hinge support is appropriate for 2000kN/m.The influence of the support on the upper shell structure is relatively large.The effect of multiple support on the settlement of single bearing is larger than that of a single bearing.The structure of the shell is affected by the gradient of the gradient from the side to the other side of the bearing.Influence of beam lateral support structure stiffness is bigger.