Connecting Body To Large Chassis Unequal Height Double Tower Connecting Structure Influence Analysis Of Seismic Response

With the continuous development of urbanization and the increasing scarcity of land resources,a large number of high-rise buildings with complex shape and changeable style came into being.Among them,the large chassis unequal height twin tower connected structure with its unique shape and flexible structural layout has become a hot spot of high-rise buildings in the city.The connection as the key part of structure,aggravating the irregularity,which makes the dynamic characteristics and seismic response of the double tower connected structure with unequal height and large chassis more complex than that of the general high-rise buildings.The seismic performance of the connected structure will be affected by the change of the number of layers,mode and position of the connected structure.Therefore,it is necessary to study the influence of connection on the seismic response of twin tower connected structure.In this paper,based on the research object of the large chassis unequal height twin tower connected structure established by SAP2000 software,new structure models are generated by changing the number of layers,mode and position of the connection body,which are analyzed for modal analysis,response spectrum analysis and linear time history analysis.The obtained natural vibration period,floor displacement,inter floor displacement angle,floor shear force,base shear and base bending are analyzed.The influence of the number of layers,mode and position to seismic performance of the connected structure is summarized.The main contents and conclusions are as follows:1.The influence of the number of connecting layers on the seismic response of double tower connected structure with unequal height and large chassisAfter the double tower structure is equipped with a layer of connecting body,the natural vibration period corresponding to each vibration mode is reduced,but the vibration mode of the first translational period and the first torsional period is not changed.The influence on the period of high-order mode is greater than that on the period of low-order mode.The torsion effect of the structure increases correspondingly.The joint arrangement can increase the lateral stiffness in X direction,but has little effect in Y direction.With the increase of the number of connecting layers,the first translational period and the first torsional period increase,while the period ratio decreases.It can increase the structural integrity,improve the lateral stiffness of X direction,but also make the internal forces such as floor shear,base shear and base bending moment of the structure increase,attracting more seismic action.2.The influence of connection mode on the seismic response of large chassis unequal height twin tower connected structureBy changing the connection mode between the connection body and the tower,the vibration mode,torsion resistance,floor shear force,base shear and base bending moment of the structure are basically not affected.When the connection mode is hinged or weak,the connection effect between the connection body and the tower is weakened.When the rigid connection is adopted,the period is the shortest.And the X direction floor displacement decreases,while the Y direction has little influence.The overall stiffness of the structure and the seismic performance of the structure are the best.3.The influence of connection position on the seismic response of the double tower connected structure with unequal height and large chassisWith the increase of the position of the structure connector,the first three natural vibration periods decrease first and then increase,which are the smallest when the connector is arranged at 10-11 floors.The torsional effect of the structure decreases first and then increases.When the connector is arranged in 10-11 layers,the torsional performance of the structure is the best.The X direction floor displacement decreases with the increase of the location of the connector,while the Y direction increases.When the connector is located in the upper part,the base shear and base bending moment of the structure is the largest.The influence of the location of the joint on the floor shear is not obvious.In the actual engineering scheme,the connection body is arranged in the middle and upper part of the large chassis unequal height double tower connected structure,which is beneficial to the seismic resistance of the structure.Figure: [102] table:[37] reference:[62]...