Research On The New Combined Isolation Method Of Steel Bar-lead Bar

China is an earthquake prone country,so earthquake disasters have caused great threat to people’s live and property for a long time.Earthquake experts in various countries began to explore a new type of seismic structure,and the seismic isolation technique is more and more accepted by the people,in the way of indirect reducing the effect of earthquake on the structure,which becomes a new trend in the field of earthquake resistance.At present,laminated rubber isolation bearing is a relatively mature technology,however,it is expensive and requires for high quality production,so that it could not be widely used in practical engineering.In this paper,a kind of low cost and simple construction of isolated form is presented:Combined isolation of steel bar-lead bar.In this paper,five layer autoclave aerated concrete block masonry structure is cited,with using the finite element analysis software SAP2000 to establish the three-dimensional calculation model.Compared steel bar-lead bar combined isolation structure(hereinafter referred to as the isolation structure)with traditional anti-seismi structure dynamic analysis,results show that the isolation structure has obvious damping effect than the aseismic structure.The main content of this paper is divided into the following three aspects:(1)Theoretical calculation of isolation layer:The quantity of steel bar,lead bar and isolation layer displacement limit are calculated.The number of steel bar and lead bar is the most important work of seismic isolation layer design,and it is also the foundation of isolated three-dimensional calculation model.Under horizontal seismic action,isolated structure deformation mainly occurs in the isolation layer,so the stability of the isolation layer is checked in order to obtain limit value of the ultimate displacement.(2)Modal analysis:For the isolated structure,the second-order effect will have a great impact on the natural period of the structure and therefore affect the other dynamic response,so the second-order effect should be considered to affect the modal analysis.Compared with the modal analysis of the isolated structure and aseismic structure,the results show that the isolation structure can prolong the natural period of the structure,so that the structure is far away from the excellent cycle of the site.(3)The time history analysis of 8 degree area multi event earthquake and rare earthquake:Isolation structure and seismic structure respectively input EL wave,TAR wave and artificial wave,which are obtained the floor acceleration,interlayer shear and the interlayer relative displacement,results showing that the seismic response of the isolated structure is significantly lower than the aseismic structure.