Analysis of vertical seismic action on torsion structure
For high-rise buildings,vertical seismic effects need to be considered only if they are in a 9-degree seismic protection zone.The new torsional structures have a large second-order effect on the vertical seismic action due to the column tilt,which is detrimental to the structure.At present,there is little research on the vertical seismic action of such structures,this paper designs torsional and non-torsional structures in the 8 degree(0.3g)zone and non-torsional structures in the 9 degree zone,and carries out a time course analysis of the structures to compare the internal force and displacement response of the structural members to the vertical seismic action.The results show that the vertical seismic action has a significant effect on the lateral shift of the torsional structure floors,the inter-storey displacement angle and the increase in the beam span moment;in the 8 degree(0.3g)zone,half of the parameters of the torsional 2 degree per storey structure increase more than those of the non-torsional structure in the 9 degree zone under large earthquakes;half of the parameters of the torsional 5 degree per storey structure increase more than those of the non-torsional structure in the 9 degree zone under small,medium and large earthquakes,which indicates that the design of a 2-degree torsional structure at each storey is subject to vertical seismicity only for large earthquakes in the 8 degree(0.3g)zone,whereas a 5-degree torsional structure at each storey is subject to vertical seismicity for both small and large earthquakes.
torsional buildingsframe core structural systemstructural designvertical seismic actiondynamic time analysis
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