Exploration On Out-of-plane Stability Of Long-span Curved Pipe Truss Structure

In this paper,Large-span pipe truss structure as the steel structure of a new kind ofimportant form of steel structure, its own weight and stress performance good characteristic.Large-span pipe truss structure are as an iconic form of steel structure, in a variety of sportsvenues, theaters, exhibition halls, railway stations, widely used in large buildings, includingaircraft terminal. In the widely used at the same time, because in order to satisfy therequirement of the architectural aesthetics and function, the shape, the span of demand ishigher and higher, immediate problem is its stable performance. The current domestic andinternational for large-span pipe truss structure plane in the stability of the study is less, sothis article research topic or very be necessary.First of all, based on a long-span curved pipe truss structure at home and abroad made adetailed introduction of application of then in view of the theory method of pipe trussstructure and made the necessary in this paper.Secondly, in this paper for long-span curved pipe truss structure out-of-plane stabilitystudy of linear buckling analysis and nonlinear buckling analysis was introduced in detail, andthen selected the lanzhou a gymnasium to do specific research object, this paper has carriedon the finite element model is established, and the nature, the linear buckling analysis, foundthe same span, ratio of high to the same vector, support conditions, the same nature, the morenumber, the greater the buckling load of pipe truss structure, namely the out-of-plane stabilityof the structure is higher. And select the three truss as the research object of follow-up, chooseit for two reasons: one, three truss as a whole, can offer itself must be outside the surface ofsupport; Two and three truss with five common, seven truss of the buckling load is not verybig difference, nature, number, in the analysis of the subsequent parameters extracted datadifference is bigger, it is easier to compare.Third, in this paper three parameters which influence the stability of pipe truss structureof the linear buckling analysis and nonlinear buckling analysis. In linear buckling stage, weextract the different span and different vector ratio and different support forms under thecondition of five order buckling mode and buckling load were analyzed; In the nonlinearbuckling stage, here we only considering geometric nonlinearity, without considering materialnonlinearity, introduced by the linear buckling analysis phase to extract the maximumdisplacement as the initial defects, we are still in view of the above three parameters wereanalyzed, the displacement, the ultimate bearing capacity of the load curve and extract, canfind the same as the linear buckling. In the design of pipe truss structure, span is smaller, thecloser the aspect ratio of0.2, support for fixed support vector, the out-of-plane stability ofstructure, the better.In the end, you have done to this article, summarizes the research topic, and for the purpose of this article without research to aspects is discussed, some Suggestions are putforward.