Comparative Analysis Of Earthquake Response On Steel Frames Under The Effect Of Slab

The structure vibration control is one of the hot issues in the seismic fortification technology now.Eccentrically and energy dissipation braced steel frame is a new kind of energy—dissipation structure developed in recent years, which viscoelastic dampers are serially connected with brace.The energy dissipation device can consume part of earthquake energy before the links and delay the links yield,protect the contiguous columns and braces to the links effectually. So it is widely used in recent years.In this paper,according to the code for seismic design of buildings and the domestic and overseas present researching results,the mechanics performances and calculation model with viscoelastic damper and the eccentrically and energy dissipation braced were studied.And it is also discussed the calculation of energy dissipation system model and performance characteristics,considering the case of eccentric floor effect of the energy dissipation of different structure, and the energy dissipation for different length of active beam.The eccentric dissipation supported of 10-layer steel structure is analyzed in this article. At the effect of high-level earthquake action, the earthquake response of the pure frame structure and the structure with different support considering slab action effect and without considering slab action effect are analyzed using ANSYS finite element numerical method.The results shows that the top floor displacements of X and Y direction of pure frame structure considering slab action reduced by 29.5% and 34.3% respectively in contrast with without considering slab action;The top floor displacements of X-direction of big eight font-style eccentrically and energy dissipation braced structure considering slab action reduced by 28.1% in contrast to without considering slab action actitve, but the Y-direction increased 8.5%;In addition, the top floor displacement of X-direction of eccentrically and energy dissipation brace structure considering slab action reduced by 26.7% by contrast with without considering slab action but Y-direction changed very little.Analysis time history analysis program in high-level earthquake of eccentrically braced steel frame with different length of active beam.The structural models in three different lengths of link beam is established to analyze the energy consumption of the seismic response of length impact.The length of active beam satisfied e/L<0.3 is shear type,which can be used formula l=2(?)bfhf/tw determination critical length of active beam when neglecting the contribution of wed for yield moment of sectional flange in steel structure. According to the analysis results,some useful conclusion is obtained which can be used into practial engineering,and all those conclusion give good suggestions to engineering designer.