Study On Influencing Factors Affecting Ductility Of High-Rise Diagrid Structural

The high-rise diagrid structure has a beautiful appearance and a large rigidity but poor ductility.There is no obvious plastic deformation under earthquake action.Based on the existing literatures on the high-rise diagrid structure,this paper proposes a parametric analysis of the ductility performance.It mainly studies the effect of the width-thickness ratio of steel tube,the axial compression ratio,the height-to-width aspect ratio and the buckling restrained braces.First,combined with the research content to summarize the use of SAP2000 finite element software.Secondly,which are established 12 finite element models according to different parameter types,and Pushover analysis those models.Calculate structural lateral displacement,interlayer displacement angle and P-Δ curve,which qualitative analysis of structural ductility.Finally,quantitatively calculate the ductility coefficient of the high-rise diagrid structure.The main research results are follows.1.The yielding order are continuous beam and inclined column.The remaining components are basically elastic.The yield of the inclined column is mainly affected by the axial tensile force and the bending moment has less influence on it.The oblique corner column can better transmit the axial force to the middle of the fa?ade,which effectively avoiding the shear-lag-effect;2.With the larger width-thickness ratio of steel tube,the structural ductility become worse;With the larger axial compression ratio of the inclined column,the structural ductility become worse;With the larger height-to-width aspect ratio of the structure,the structural ductility become worse;Setting the buckling restraint member can improve the structure ductility.