The Overall Mechanical Performance Analysis Of High-Rise Building Structure With Long And Narrow Floor

In the analasys of building structure, there is two main theoretical hypothesis of floor which is Rigid and Elastic. For the sake of shorten the time of calculation, we use the Rigid theoretical hypothesis for doing stuctural analasys with no any problem at most of the time, but it will affect the calculation results when it comes to strctures with long and narrow shape of foor.In this paper, the structure analysis software Midas/gen is used for doing analasys of frame structure with different floor stiffness, and the analysis of the dynamic characteristics of the structure and the overall bending and internal forces, comes to the following main conclusions:1. Elastic theoretical hypothesis makes smaller stiffness compare with the ridgid model. With the increasing ratio of length to width, the torsional effect cannot be ignored, mean while the weak axis of the structure show larger differences of story displacement.2.Analasys with Elastic theoretical hypothesis makes small impact of overall bending of strcture.3. Respectively for the rigid and flexible floor, Shear differences of the middle column cannot be ignored when the ratio L/B≥7.4. When the column stiffness increases, the increase of thickness, the in-plane deformation effect weakened gradually, thickness during 90～180 mm, the overall impact under 3%.5. Seismic intensity of the influence of floor deformation is small, about 2%～3%.6. Spacing decreases resistance to lateral force structure can reduce the long and narrow floor deformation disadvantageous effect on the structure, reduce the displacement difference between layers, can reduce the middle column shear distribution gap, and can significantly reduce the floor stress.7. Project instance analysis shows that the elastic assumptions column Angle of floor stress had a tendency to increase.