| The plate-cone reticulated shell structure is a new type of space structure developed through adaptation and innovation on the basis of foreign actual engineering cases.It is composed of chords and cone elements,and the webs of the double-layer reticulated shell are replaced by cone elements.The overall rigidity of the structure is large,and the plate mainly bears the internal force of the film,which can give full play to the advantages of the plate.It has the advantages of high industrialization,convenient transportation,beautiful appearance,and low cost.It is a very promising spatial structure.There is very little research on the plate-cone reticulated shell structure in China,and it is still at the stage of theoretical research.This paper proposes to conduct model tests on the platecone cylindrical reticulated shell structure,design its detailed structure,and propose several nodes and supports The connection mode of the nodes is designed according to the structure form of two types of cone models and the splicing angle between the cones,which reduces the processing difficulty.The test model is subjected to loading tests under two load conditions of normal load mode and failure load mode to study structural stability,force form,reasonable connection structure and the whole process of failure.Obtain the internal force distribution,load-displacement curve,ultimate bearing capacity and failure form of the structure,verify the correctness of the theoretical analysis and the reliability of the structure,and provide a scientific basis for the practical application of the plate-cone reticulated shell.At the same time,the platecone reticulated shell is given.Suggestions for the structure in the design.According to the morphological characteristics of the slab-cone reticulated shell structure,the pre-processing modeling program is parameterized using the APDL language that comes with ANSYS software,and the specific program code is given in the appendix,which provides convenience for subsequent researchers.The test model of the plate-cone cylindrical reticulated shell structure adopts the arc length method and introduces the initial defects for nonlinear buckling analysis.The material nonlinearity is taken into account,and the load-displacement curve is obtained.Finally,the test model is compared with the ordinary cylindrical reticulated shell.Comparative analysis of the ultimate bearing capacity of the structure.Through the finite element analysis results and the test results and the comparative analysis with the double-layer cylindrical reticulated shell structure,the following conclusions are obtained: the force flow transmission direction of the structure is along the direction of the arch axis,the longitudinal node displacement is basically the same,and the displacement in the direction of the arch axis is relatively large in the middle span.Large,small edges,large overall rigidity of the structure,the change law of the load-displacement curve and the failure form are basically the same.The weak part of the plate-cone-cylindrical reticulated shell structure is at the connection of the nodes,and its ultimate bearing capacity is determined by the connection of the nodes.Strength control,the ultimate bearing capacity of the double-layer cylindrical reticulated shell structure is controlled by local stability,and the ultimate bearing capacity of the plate-cone cylindrical reticulated shell structure should be the same as that of the doublelayer cylindrical reticulated shell structure.Through the above analysis,it can be seen that the modeling method and analysis method adopted in this paper are effective analysis methods,which provide a theoretical basis for the engineering design and construction of the slab-cone cylindrical reticulated shell structure in the future. |
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