The Dynamic Analysis Of Steel Frame-sandwich Frame Structure

Nowadays, with the development and construction of new rural cities,more and more buildings are springing up.It is higher on the function of building use request. Such as business clubs, luxury hotels, office buildings and other new buildings because of its special features, buildings often need to set local high space.In order to meet the demands of people, we tend to bear the upper load beam with large span.Traditional design methods generally use the cross beam.But this form can only be used in the case of local high space at the top of a building.When a local space in a building at the middle-tier, cross beam cannot be used.When a large space in the bottom, the traditional structure design method to introduce the special structures.In the traditional design of the large-span, designers tend to design long span girder to special structures as truss beams, prestressed beams and thin web beam etc.Design theory of these traditional methods is more complex and construction operations is difficult.In terms of specific applications of traditional design methods have certain limitations.In light of the above, this paper proposes sandwich frame structure with steel frame system.When there are large space in new buildings,filled with frame column, through regulation of large-span beam and reduce peak bending moments of large span beam,force structure in case of not enlarging section is more uniform and reasonable.This will not only meet the requirements of building but also structural design requirements.In view of the new form, this article from the basic mechanical static and seismic performance of two aspects of lithology respectively. In terms of statics, based on previous research this paper sandwich frame column of the basic equation of bending moment effect,that sandwich beam frame column in the distance0.2L to regulation of bending moment is the best. By changing the location of the layer, we can see that effects on structures.By comparing sandwich frame column and beam with large span rigidity ratio, sandwich frames cylindrical bars with stiffness ratio,we can get the optimum interval linear stiffness ratio and provides designers with reference.In terms of dynamic time history analysis, this paper made up for the gaps in systems in dynamic analysis of structures.First introduced some seismic theory and the dynamical equations are derived.Analyzes the factors affecting the selection of seismic wave and Select two actual earthquakes curves and a simulated time-history curve.Subsequently based on finite element analysis software introduces MIDAS Gen, describes this software in the dynamic analysis of the advantages and disadvantages.Finally, steel frame sandwich using MIDAS Gen dynamic time history analysis of frame,in earthquake cases evaluated drift angle of structural flexibility, concluded that the structure has better seismic performance.Under rare earthquakes respectively obtained in strong and weak axes directions of plastic hinge hinge order, analysis of structural damage.Calculation of elastic-plastic layer angle of displacement, drawn steel frame-sandwich frame structure has better seismic performance.