Study On Structural Performance Of Three-Center Cylindrical Reticulated Shell Of Long Span Dry Coal Shed

In recent years,the three core cylindrical reticulated shell structure is widely used in the construction of dry coal shed because of its high space utilization rate and its structure shape close to the process boundary.At present,in view of the large span dry coal shed structure,from the actual engineering,the research on the influence of the parameter rise span ratio on the overall structure performance is less.Taking the 113 m span dry coal shed as the research object,this paper uses SAP2000 finite element structural analysis software to carry out static analysis,stability analysis and dynamic analysis of the three center cylindrical double-layer latticed shell structure,compares the influence of the mechanical performance of the latticed shell structure under different rise to span ratio,selects the economic and reasonable small range rise to span ratio,and optimizes the structural layout of the reinforcing belt Design research.First of all,this paper introduces the general situation of the three core cylindrical double-layer reticulated shell structure,the relevant equipment and technology of the dry coal shed and the structural scheme,and checks the stress ratio of the structure.The static analysis of the structure is carried out,the internal force and displacement values of the structure under different load combinations are calculated,the amount of structural materials is calculated,and the influence of different ratio of rise to span on the static performance and material amount of the three center cylindrical double-layer latticed shell structure is compared and analyzed.Secondly,the characteristic buckling analysis and nonlinear stability analysis with initial geometric defects are carried out by selecting the full span uniform load under the action of standard combination,and the influence of different rise span ratio on the stability performance of the three center cylindrical double-layer latticed shell structure is analyzed comparatively.Thirdly,the natural vibration characteristics of three center cylindrical double-layer latticed shell structure are analyzed,and the reasonable modal order is selected to obtain the natural frequency and mode characteristics,which also provides data for the parameter setting of the time history analysis method.The response spectrum method of mode decomposition and time history analysis method are used to analyze the dynamic characteristics under the action of single and three-dimensional earthquake,and the change rules of axial force and node displacement of members are obtained.The influence of different ratio of rise to span on the dynamic performance of three center cylindrical double-layer latticed shell structure is compared and analyzed.Finally,the optimization design of the double-layer reticulated shell structure with three center cylindrical surface is carried out.The local axial force of the structure is dispersed by reasonably arranging the reinforcing belt,so that the overall mechanical performance of the structure is better and the structural deformation is smaller.According to the dynamic and static characteristics of the structure and the consideration factors of the layout of the reinforcing strip,four layout schemes are selected.Through the comparison of the schemes from the aspects of temperature action,wind load action,earthquake action and the static performance of the structure,the variation characteristics of the axial force of the members and the node displacement are obtained,and then the reasonable layout scheme of the reinforcing strip is determined,which provides reference for the optimal design of the same large-span structure.