Research On Design And Consruction Of Large-span Ellptic Chord Dome Structure

With the rapid development of China's national economy,the public sports industry is also booming,a variety of large span space structure came into being.The suspendome structure with the characteristics of novel structure,transparent,save steel,the advantages of stable performance etc.widely used in all kinds of public sports buildings,the suspen dome has been built at home and abroad in recent cases of roof structure.This paper takes Tianjin District of Baodi City Gymnasium suspendome structure as the research object,the shape of suspendome and several key problems in design and construction of the structure of long-span elliptical.Study on first suspendome structure of static and dynamic performance,establish the structural static and dynamic finite element model,the static analysis,under the action of earthquake deformation and internal force distribution characteristics,put forward suggestions on structural design.On the influence of rod length and prestress on the static and dynamic characteristics of the structure.Secondly,the construction of the whole process analysis of structure,through scheme selection identified "construction plan is divided into three levels,the scaffold support completion of tension prestressed".Using the finite element analysis software MIDAS/gen,using the tension relaxation method,the construction process of the construction process simulation.Analysis of the internal force of the cable in the construction process,the internal force of the radial tension rod,the variation of the internal force and the displacement of the whole structure.The reasonable construction scheme is determined,which provides the theoretical support for the safety construction,and provides the theoretical basis for the layout of the monitoring points.Finally,the cast steel joints of cable strut fracture performance limit under different operating conditions were analyzed on the bearing capacity,at the same time through the SMCS and VGM two kinds of micro fracture prediction model of cable strut fracture of cast steel joints under monotonic loading,determine the cable strut of cast steel joints fracture location,failure mode and ultimate bearing capacity.This paper studied the long-span elliptical suspen dome roof structure design and several key problems in the construction,in order to provide reference for the application of this kind of structure.