Analytical Studies On Shear-gravity Ratio At High-rise Steel Frame-concrete Core Tube Structure With Dissipation Energy Devices

In this paper, a series of research is carried out on the steel frame-concrete coretube structure with dissipation energy devices. The feasibility of reducing theshear-gravity ratio and the factors that the influencing factors of shear-gravity ratio ofthe energy-dissipation structure were researched.The main research contents andconclusions as follows:1、Based on damping force ratio control indicators and use vertical uniformlayout damper way，the software of ETABS and PERFORM-3D was use to study theseismic performance of structure under frequent earthquake and rare earthquake. Byfrequent earthquake analysis results with the corresponding seismic design ofbuildings of2010version of the response spectrum value comparison,the feasibilityof reducing the shear-gravity ratio was researched,.The results show that: theearthquake response of the structure with dissipation energy devices could obviouslycontrol,and the structure seismic behavior could be could improved;When When theadditional damping ratio is greater than0.041and the damping force ratio is greaterthan0.1,The structure with viscous damping can reduce the minimum shear-gravityratio to the seismic design of buildings of0.85.2、The influence of damping ratio on structures with different dissipation energydevices were studied. The results show that: For the structure with viscous dampers,with the increasing of damping ratio, the basal shear-weight ratio has maintained adecreasing trend, but when the damping ratio increased to20%, no longer reduced andinstead of increased. Additional stiffness have greater impact for structure with metaldampers, no significant variation of base shear under different damping ratio, But issmaller than the original structure.3、Based on maximum drift angle control indicators，structure with visousdampers and metallic dampers for eight different disposals was designed.Analysis ofthe impact of the arrangement position of the damper in the structure of the shear- weight ratio，The results show that: When the damper disposed in the lower portion ofthe structure，the base shear-weight ratio of the structureis minimum；When thedamper is arranged in the upper part of the structure, the base shear-weight ratio islargest.4、Select120seismic waves in four types of site to the time-history response ofthe structure under frequently earthquakes，the The variation of the shear shear-weightratio of structures under different site was studied, The results show that: the shearshear-weight ratio of structure with different damper under different site is different:For the structure with viscous dampers,the narrows of shear-weight ratio is bigger onthe hard grounds than in the soft sites:Class III and class IV venue shear decreasesmuch more than class I and class II venue of structure with metal damper.