Comparative Analysis Of Seismic Performance Of Super-tall Steel Frame And Its Additional System

The lateral stiffness of the pure steel frame is small,and it is easy for the cambi um failure mechanism to cause the collapse of the structure under the action of strong earthquake.Usually,the overall lateral stiffness of the structure can be enhanced by ad ding additional structures.This article mainly steel weight of the three main body is di fferent,different first layer shear weight ratio(C_B)of pure steel frame as the initial model,through the difference between the steel weight of the three main body set up a dditional fixed in the form of truss and additional truss column foot fixed form just an swer and articulated respectively,a total of nine model is set up,push through the stati c pushover analysis and dynamic time history analysis to explore the influence of diff erent parameter changes of super-tall steel frame structure.The static push-over analysis to analyze the model of plastic hinge out of the hinge order,the layer shear force,inter-layer displacemen,the results show that for the(1)(2)(3)model have different of C_B,C_B on the plastic hinge distribution were not significantly influence,C_B the greater the model by shear layer is,but the interlayer displacement is relatively small Compared with thze equivalent weight model,it is found that the pure steel frame with additional fixed truss can improve the deformation concentration,but reduce the strength of the structure.The distribution of plastic hinge is improved,the layers are dispersed,the energy dissipation capacity of the main structure is improved,the displacement between bottom layers decreases Different the form of column foot has no obvious influence on the shear force,the displacement between layers and the distribution of plastic hinge.Two sets of seismic waves were input into the model for dynamic time-history analysis.The layer shear force,inter-layer displacement,residual deformation,elastic-plastic deformation energy and plastic deformation energy of the model are analyzed.Results show that:1.Different of C_B the pure steel frame(1)(2)(3)models,the C_B smaller,the smaller the layer by layer shear model also,but the displacement between layers is relatively big,residual deformation affected by seismic waves,C_B on residual deformation structure,elastic-plastic deformation energy,little influence on the plastic deformation energy of structures.2.Under the same weight of pure steel frame by shear layer is greater than the pure steel frame,additional fixed forms of truss,through the inter-layer displacement,the residual deformation,layer of elastic and plastic energy structure and component of plastic the size of the.total energy analysis and comparison,it is related to the seismic performance of main pure steel frame with additional fixed truss and the weight layout of the additional structure3.For the three groups of models with different forms of column footing,the different forms of column footing have no obvious influence on the layer shear force and inter-layer displacement,but have a great influence on the residual deformation of the model.The elastic-plastic deformation energy of the structural layer and the plastic deformation energy of the component are mainly affected in the first layer,while the other layers have no obvious influence...