Parametric Design And Comparative Analysis Of Static And Dynamic Performance Of Partially Double-layer Semi-open Reticulated Shell

By using ANSYS Parametric Design Language(APDL),this paper compiled parametric design macro program for six types of partially double-layer semi-open spherical reticulated shell structure.The static and dynamic performance and its influencing factors of structure are analyzed.The main contents of the article are as follows:(1)The distribution of rods and nodes in different types of partially double-layer semi-open spherical reticulated shells was discussed.According to the design methods of single-layer and partially double-layer spherical reticulated shells,the parametric design macro programs of partially double-layer semi-open spherical reticulated shells were programmed.By given geometric parameters,the parametric design and model selection of twelve types of partially double-layer semi-open spherical reticulated shell structures were realized.(2)According to the distribution law of bars and nodes of partially double-layer semi-open reticulated shell structure,the macroscopic and microscopic geometric relations of six selected partially double-layer semi-open spherical reticulated shells were established.These formulas laid a foundation for the design and the comparative analysis of static and dynamic performance of partially double-layer semi-open reticulated shell.(3)The static performances of six kinds of typical partially double-layer semi-open shell were compared.The comparisons and analysis of large span single layer semi-open reticulated shell and partially double-layer semi-open shell were made.The static performances of the influence factors of partially double-layer semi-open reticulated shell were studied.The location and distribution of the maximum displacement and maximum stress of six typical partially double-layer semi-open reticulated shell were analyzed.The structure types with good mechanical properties were summarized.These researches provided reference for the useof partially double-layer semi-open reticulated shells in large span open air structures.(4)ANSYS was used to analyze the natural vibration characteristics of single and partially double-layer semi-open spherical reticulated shells.The modes and natural frequencies of various reticulated shell structures were calculated.The influences of different span,vector height and thickness of reticulated shells on the natural vibration characteristics were studied.The characteristics of natural vibration of single layer and partially double-layer semi-open spherical reticulated shells were compared and analyzed.This provided the conditions for the dynamic response analysis of partially double-layer semi-open spherical reticulated shells under earthquake action.(5)ANSYS was used to analyze the 3d seismic time-history response under the dual nonlinear condition of partially double-layer semi-open spherical reticulated shells.The maximum node displacement and displacement time-history curves of different types of partially double-layer semi-open reticulated shell structures were calculated.The influences of the main geometric parameters on the dynamic characteristics of reticulated shell structures was studied.In this paper,the dynamic characteristics of partially double-layer semi-open reticulated shells were compared and analyzed.The structure types with better seismic performance were summarized.This provided a basis for the dynamic design of partially double-layer semi-open spherical reticulated shells in practical engineering.