Analysis of seismic performance of torsional structure buildings under two-way horizontal earthquake
In order to study the seismic performance of the torsional body structure composed of torsional steel frame-vertical core under two-way horizontal earthquake action,different torsional angle models with 20 sto-ries were established using ETABS.Based on the analysis of the self-oscillation characteristics of the torsional structure,the responses of the non-torsional and torsional structures under the two-way horizontal earthquake ac-tion were comparatively studied by using the elastic time analysis method.The results show that the base shear force of the torsional structure is larger under the two-way horizontal seismic action compared with the conven-tional non-torsional structure,and the base shear force increases with the increase of the torsional angle.The axial force distribution of the corner column at each level of the torsional structure is not uniform,and the de-gree of inhomogeneity becomes larger with the increase of the torsional angle.The twisting of the structure changes the magnitude of the shear force in the X-direction and Y-direction of the corner column,which can make the direction of the structure with high lateral stiffness bear greater shear force,and is less affected by the angle of twisting.The maximum moment in the span of the outer frame beam of the torsional structure is larger than that of the non-torsional structure,and the moment of the outer frame beam increases as the floor increases and the torsional angle of the structure increases,and the structural torsion has an adverse effect on the outer frame beam.The internal forces in the core of the torsional structure are greater than those in the non-torsional structure,and increase with the increase of the torsional angle.When the torsional structure is subjected to verti-cal load,the core barrel is subjected to a larger torque,but the effect of the torsion of the outer frame on the core barrel torque is smaller under the horizontal earthquake action.
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