Study Of Anti-seismic Performance Of Low-layer And Multi-layer Regular Steel Frame Of Exposed Steel Column Foot

With the development of assembly buildings,the development of industrial buildings and the introduction of the concept of green building,steel construction began to reveal the unique advantages.Steel structure buildings has excellent performance of anti-seismic,researchers have had considerable results in the study of steel structure buildings,however,there is not much research on the influence of the anti-seismic of low-layer and multi-layer regular steel frame of exposed steel column foot.In order to study the influence of the anti-seismic of exposed steel column foot to the low-layer and multi-layer regular steel frame,23 models of 3shapes of frame of larger strong column coefficient were built,consider strength coefficient of exposed steel column foot,shape of frame and shear-weight ratio of the first floor to be main parameters,two-rank nonlinear software is used for elasto-plastic static and dynamic analysis of model.Inspecting the regular pattern of the distribution of the the damage of the structure.The main research works are as follows:(1)23 models of 3 shapes of frame,shear-weight ratio of the first floor of 0.3 and 0.35 were built,the parameters such as the load of each model and the yield bending moment are calculated and the calculation method of each parameter of the model is introduced.(2)Two-rank nonlinear software is used for elasto-plastic static of 23 models,the layer shear force-interlayer displacement relationship,the plastic hinge distribution of the whole frame,the bending moment-angle and axial force-angle relationship of column are obtained.(3)Two-rank nonlinear software is used for dynamic analysis of 23 models,the maximum story-drift angle,the deformation concentration rate of first layer,the proportional distribution of plastic-deformation energy and the dynamic response curve relationship of each model are obtained.Discussing the dynamic response mechanism of different parameters to each model.The results show that: the parameters of strength coefficient of exposed steel column foot,shape of frame and shear-weight ratio of the first floor have a certain impact on layer relationship of structure and the components of deformation,force and energy consumption.The deformation of the first layer is concentrated in low-layer structure,the smaller the strong column coefficient is,the more concentrated the deformation is;the deformation is distributed on middle layer in multi-layer structure,the effect of strength coefficient of column on structural deformation is smaller than that of low-layer structure.Column foot of low-layer product axial pressure on both pressure and tension sides,yield moment of column foot is larger than anchor bolts themselves;and column foot of multi-layer product axial tension on tension side,yield moment of column foot is smaller than of anchor bolts themselves.The biggest distribution of plastic-deformation energy of column is about 8%,the energy consumption of exposed steel column foot is poor.Under the action of earthquake,the M-?dynamic response curve relationship of the column foot is slip type.