Analysis Of Stability,Static And Dynamic Performance For Large-span Spatial Truss String Structure

Truss string structure is a new type of space structure form.And that is“by tensiling the string,the poles and beams in accordance with the combination of the actual demand”. its name is based on the stress characteristics of the structural system.That is a kind of self-balancing system, it can make full use of the static characteristics of arch structure, and can make full use of the characteristics of high tensile steel cord. With reasonable force, strong stiffness,it can realize long-span building model requirements. Has been widely used at home and abroad.This paper choose large-span truss string structure as the analysis object, by using nonlinear finite element analysis method. The static and natural vibration properties of the structure, stability,dynamic properties were studied. Main work includes the following aspects.Firstly, analysis of static and the natural vibration characteristic for structure.Combining the nonlinear analysis methods, by the static analysis for structural,proved a variety of the structure under the condition of the static performance. And analysis of the natural vibration characteristics of the large-span truss string, of which the string structure engineering example in static performance analysis,. Include a variety of loads, such as the dead load and live load, wind load, and so on.Characteristics of internal force and displacement of nodes, and extraction are summarized through the analysis, the load-bearing performance characteristics of the analysis. To provide reference for subsequent structure dynamic performance analysis.Secondly,using the ANSYS parametric design language(APDL), the command flow for large-span truss string for structure modeling is written. changing support form,different initial defects setting is considered,and geometrical nonlinearity and material nonlinearity, analyzing structure modeling is built, obtained the structure that as a linear buckling and nonlinear buckling load displacement curve and its change rule. The large-span truss string structure stability performance is evaluated.Thirdly,the analysis of dynamic performance for structure.Using multiple seismic time history analysis.The dynamic responses of structures under the action of the horizontal seismic are analyzed.Respectively discussed under horizontal seismicaction, many kinds of seismic waves,the large-span space string dynamic response characteristics of truss structure.And the node displacement response.The acceleration of the cross reaction as a breakthrough point are analyzed.Through the establishment of multiple models,analysis contrast,different number of poles set a string of long-span Space truss with the effect of the earthquake.The long-span truss structure on the lower chord unit axial force are discussed in paper, it is concluded that under the seismic action of axial force in the structure unit.