Research On Dynamic Characteristics And Influencing Factors Of Seismic Performance Of Two-Tower Connected Structures

Two-tower connecting structure refers to a structure composed of two towers connected by connecting elements set at a certain height.Because the existence of connecting elements makes the towers which vibrate independently interact and influence each other,the force characteristics of the two-tower connecting structure under earthquake are much more complex than that of single-tower structure and two-tower structure without connecting elements,and it is liable to coupling vibration under earthquake.Deformation inconsistency and damage and many other problems.In this paper,the dynamic characteristics and seismic performance of the twin-tower connecting structure are studied,which can provide useful reference value for similar engineering design.In this paper,the influence of the existence of the connecting body on the dynamic characteristics of the twin-tower connecting structure is studied in depth.The influence laws of different connection modes,different layers of the connection and different positions of the connection on the dynamic and seismic characteristics of the two-tower connecting structure are studied.The influence of viscous dampers on seismic behavior of two-tower connecting structure is studied.The main research achievements are as follows:(1)Through modal comparison analysis of two-tower connecting structure and singletower structure,it is found that the first three modes of the two structures are the first Xtranslation,the second Y-translation and the third torsion around the Z-axis.The existence of the connecting body does not change the direction of vibration of the first three modes of the structure,but changes the period of the vibration.The period ratio of the two-tower connecting structure is 0.17 higher than that of the single-tower structure,which indicates that the torsional rigidity of the whole structure is reduced due to the existence of the connecting body.(2)Through variable parameter analysis of the connecting body,it is found that the period ratio of flexible connection between tower and connecting body at both ends is 8.6% lower than that of rigid connection at both ends,which indicates that flexible connection can reduce the torsional effect of the structure.However,the interfloor displacement and floor shear force when the tower is rigidly joined to both ends of the connecting body are small,which indicates that the rigid connection can increase the lateral stiffness of the structure.The period ratio of the structure increases with the increase of the number of connecting layers,which indicates that the torsional effect of the structure increases with the increase of the number of connecting layers.The interfloor displacement and floor shear decrease with the increase of the number of connected floors,which indicates that the increase of the number of connected floors can increase the lateral stiffness of the structure.As the position of the connecting body increases,the torsional effect of the structure decreases and the lateral stiffness increases.The sudden and large decrease of X-direction inter-floor displacement will occur on the connecting floor,up to17.4%,which indicates that the existence of connecting body significantly increases the lateral stiffness of the connecting floor.(3)Through dynamic time-history analysis,it is found that floor displacement,inter-floor displacement angle and floor shear force of the damping structures with viscous dampers on the three connections are effectively reduced compared with the original structure,and the damping structure with viscous damper positively V-shaped arrangement has the best reduction.Through energy analysis,it is found that the energy consumption rate of viscous damper with positive V-type arrangement is better than that of single diagonal brace and inverted V-type arrangement,and the energy consumption performance of viscous damper under frequent earthquakes is better than that under rare earthquakes.