Seismic Analysis Of A Tall Building Structure With Transfer Story

With the development of national economy, the high-rise building structures springup tall and straightly into the sky all over the country. The offices and residential oftenrequire large space to be used as a public place at the bottom, while the upper structurerequire small space, so conversion components are set.Tall building structures with aconversion layer does not directly force transmit horizontal force under seismic action,because the superstructure stiffness is greater than the substructure below conversionlayer, which makes it easy to form a weak layer. However, the conversion layer iscommonly used in the high-rise building structure.Building functions have becomestrictly to demand a proper location of the conversion layer. Force and deformation areobviously different with high conversion from low conversion structure under theearthquake. In this paper, ETABS finite element software is applied to analyze theseismic performance of the tube structure with a conversion layer.①Modal response spectrum analysis is done to study period, floor displacement,story drift, story shear force and overturning moment with the tube structure with aconversion layer of different conversion layer located at1,3,5,7,9layer. The resultsshow that: with conversion layer position variation, the floor displacement of structure,the floor shear force and overturning moment and the period did not changesignificantly; the ration of the torsion cycle to the first translational cycle is higherwith the conversion layer position increasing,and the torsion effects increase;②The location of conversion layer has a great influence on the shear distributionof the frame-supported walls and floor walls. The shear distribution does not vary whenconversion layer set in the first layer; With the conversion layer location increasing,seismic shear distribution of the frame-supported walls and floor walls severely mutate.Because the conversion layer floor needs to pass a lot of horizontal force on structures,it is very unfavorable;③By changing its equivalent lateral stiffness, the response spectrum analysis isdone while the conversion layer is respectively set3,5,7and9-layer in tube structure.The analysis shows that: the equivalent stiffness ratio exert great influence on the layerdisplacement angle, the seismic shear force distribution and the displacement of the tubestructure with a conversion layer, When the equivalent lateral stiffness ratio decreases,the maximum displacement of the structure of floors has increased, and the displacement angle between floor layers near the conversion layer mutate seriously.Theearthquake shear distribution of the frame-supported wall and floor wall severely mutate;④Seismic analysis is done when the conversion layer respectively set in thelayer5and7layer in tube structure under the assumption of rigid floor assumptions andflexible floor. The analysis shows that: the shear force is large at the frame-supportedwall upper conversion layer, and the frame-supported column shear force and moment issmaller under the assumption of rigid baffle box than the elastic floor;⑤Finally, the history analysis is done to analyze the conversion layer set in layer5and7-layer in tube structure. the history analysis and response spectrum analysis showsthat the results are basically consistent.