Analysis Of Static Stability And Dynamic Response Of Suspend-dome Structure

The suspend-dome structure is a rigid and flexible long-span prestressed structure,which is composed of the upper single-layer reticulated shell and the lower cable-stayed system.However,the chord dome structure is sensitive to geometric defects and its stability is the most prominent problem at present.In recent years,earthquakes occur frequently at home and abroad,and the chord dome structure is often used in large public buildings such as stadiums and museums,so its dynamic performance under the action of earthquakes cannot be ignored.In this paper,the actual project of the stadium of Hebei North university is selected as the research object,and the static and dynamic stability of the stadium is calculated and analyzed by ANSYS finite element software.This paper mainly studies the following three aspects:1.As the research object,the characteristic value buckling analysis and nonlinear buckling analysis were carried out for the steel roof with the chord support above.In the calculation,geometric and material nonlinearity,adverse arrangement of live load,distribution pattern and size of initial geometric defects and other factors were considered to study the static stable bearing capacity of the roof structure.It is found that the arrangement of live load affects the buckling deformation mode of the suspend-dome structure.The bearing capacity coefficient is not the lowest when the initial geometrical defects of the suspend-dome are introduced according to the lowest buckling mode.The structure of suspend-dome is sensitive to the change of the initial geometric defects.2.Considering the influence of the reinforced concrete structure at the lower part,the natural vibration characteristics of the dome roof with single chord and the whole structure of the stadium with upper and lower parts working together are compared and analyzed.It can be seen that considering the lower concrete structure,the natural vibration frequency of the whole structure is reduced and the natural vibration period is prolonged.Considering the stiffness of the lower structure,the vibration mode of the roof starts to change.3.Input Taft wave,El-Centro wave and artificial wave three dimensional seismic wave,for monochord dome roof and upper structure to work together in the overall model and earthquake,earthquake resistance,the rarely met earthquake under extremely rarely met earthquake dynamic response calculation and contrast analysis,the paper mainly discusses the lower concrete structure's influence on the seismic performance of steel roof in aviation building of upper,as well as the two structure under severe earthquake and very rarely met earthquake elastic-plastic time history analysis,comparing the distribution of roof plastic bar.The results show that,Taft wave input,EL Centro and artificial wave 3 d seismic wave,for monochord dome roof and upper structure to work together in the overall model and earthquake,earthquake resistance,the rarely met earthquake under extremely rarely met earthquake dynamic response calculation and contrast analysis,the paper mainly discusses the lower concrete structure's influence on the seismic performance of steel roof in aviation building of upper,as well as the two structure under severe earthquake and very rarely met earthquake elastic-plastic time history analysis,comparing the distribution of roof plastic bar.The results show that,considering the substructure,the steel roof shares part of the substructure's seismic action,amplifies its horizontal displacement,and produces similar "whipping effect".Considering the substructure,it has adverse effect on the internal force of the annulus cable.In this paper,the upper mesh shell corresponding to the 3-5 loops of the structure is the weak area.Considering only the single roof model will overestimate the seismic performance of the structure,and the influence of the lower reinforced concrete frame structure cannot be ignored.