| In the environment of development of sustainable green building and national housing industrialization,cold-formed thin-walled steel structure has widely used to the construction of villa and residence,and disaster area reconstruction,with many advantages such as green environmental protection,convenient construction and good seismic performance.However,the research on the mechanical behavior of the whole structure is not enough,and it has not formed a mature theory.At present,the structure system is mostly built into two or three layers,and it is seldom applied for the structure of four,five,six layers.With the increase of structure height,the stress deformation of the structure are more complex,which will damage to the structure.The wall is an important shear element in the cold-formed thin-walled steel structure,for the stiffness of the structure can be effectively increased and the deformation of the structure can be controlled by the reasonable wall supporting form.In this paper,the large-scale finite element software SAP2000 is used to establish the wall supporting model of three different forms,and the advantages and disadvantages of different models’ seismic performance are compared,combing the research status of cold-formed thin-walled steel structure at home and abroad.Then a reasonable wall supporting form is used to establish respectively cold-formed thin-walled steel structure model of four to six layers,whose structural response under different earthquake actions is studied,and the main content of the research is the following:Three layers unsupported wall model,monoclinic rod supporting wall model,herringbone supporting wall model and X-supporting wall model are established to analyze dynamic performance,to comparative analyze the influence of different wall supporting forms on dynamic performance of structure.The results shows that the X-wall supporting can effectively improve the stiffness of the structure and reduce the cycle of the structure,The structure period of X wall supporting wall with single pole support wall can be reduced by 14.7%.Response spectrum analysis under 8 degree and 9 degree frequent earthquake of the model of three different wall supporting form is made,different structural models are established,time-history analysis under the 8 degree frequent and rare earthquake of EL-Centro wave,Taft-wave and artificial wave is made,the influence of different wall supporting form on the structural top layer displacement and story drift angle is studied,the advantages and disadvantages of various wall supporting seismic performance are compared,and the results show that three kinds of models all can satisfy the requirements of seismic performance,and X-wall supporting can effectively lower the maximum displacement of the top of the structure and story drift angle,which is appropriate as wall supporting of height of higher structure.The cold-formed thin-walled steel structure model of four to six layers is established by using X-wall supporting,to make the dynamic performance analysis.The results show that the period of four to six layers can meet the requirements,and with the increase of the height of the structure,the period becomes larger,and the natural vibration period of the structure of the six layer is increased to about 36.7%compared with that of the four layer.The response spectrum analysis of three kinds of models in the earthquake of 8 degrees frequent earthquake,as well as the time history analysis of EL-Centro,Taft wave and artificial wave under the condition of 8 frequent earthquakes.The results show that,on the basis of reasonable arrangement of the structure,the structure is reasonable and the integrity is good.When the structure is built to the six layer,it can meet the seismic requirements. |
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