Influence Of Secondary Frame Support On Dynamic Response Of Mega Frame Structures

Mega-frame as a superior form of building structure,many high-level will be used,but in order to increase the horizontal stiffness of the structure is often added in the structure of a certain number of shear walls,so increase the rigidity of the structure will greatly increase the structure Weight,so that the burden of the foundation is too large,but also increase the project cost.Based on the advantages of mega frame system and supporting structure,this paper proposes a mega-frame-subframe support system.The main conclusions of this paper are as follows:(1)The four models are applied to the level of ELCENTRO wave,Taft wave and Nanjing wave,the maximum horizontal displacement of the structure of 3 seismic wave value increases with the increase of the peak acceleration,and the maximum horizontal displacement occurs at the top of the structure.(2)In the ELCENTRO wave,Taft wave and Nanjing wave loading,local seismic peak acceleration is 70cm/s2,the value of displacement relative to the center support model and eccentric supporting model larger maximum displacement of BRB model;local seismic peak acceleration is 400cm/s2,the value of displacement relative to the center support model and the model value to small eccentric support the maximum displacement of BRB model.When the peak acceleration is 70cm/s2,BRB model relative to the center support model and supporting model of eccentric decline is not obvious,with center support,but when the peak acceleration is 400cm/s2,and the energy consumption of mega frame fortification buckling support and K shape eccentrically braced is better than adding X shaped mega frame center support,only from considering the seismic fortification should adopt the brb.(3)Under the action of different seismic waves,the mega frame structure presents the lateral displacement curve which is mainly shear deformation.Under the action of seismic wave with the peak acceleration of 400cm/s2,the displacement of the 1 and the 2 layers of the mega layer of the three models is not very different,and the displacement of the great layers of the 3 and the 4 layers is obviously different.The displacement of the support model is obviously smaller than that of the original model.It is proved that the support can improve the lateral stiffness of the structure.At the same time,this paper chooses the support of the mega frame(3,and 4layers)with the largest displacement of the structure.