Study On Seismic Performance Of Mega-structure With Dispersive Tubes

As the main lateral-force-resisting element of the frame-core tube structure,the core tube is generally located in the middle of the structure.Under the action of rare earthquakes,the core tube is subjected to the destruction of most of the seismic forces due to the excessively large stiffness,and the outer frame is damaged.Insufficient stiffness results in excessive deformation of the entire structure and rapid failure.In view of the problem of core tube failure under earthquake and the relative concentration of frame-core tube structure stiffness,the architectural and structural advantages of the dispersion tube structure are used.This paper combines the dispersion tube with the mega-structure to form mega-structure with dispersive tubes,and the problem of relatively concentrated frame-core tube stiffness is solved,and the seismic performance of the structure is improved.In this paper,the nonlinear finite element software is used to compare the seismic performance of the mega-structure with dispersive tubes and the frame-core tube.The overall performances and seismic damage performances of the two structural systems are compared from the story-drift,the vertex displacement,the base-shear,and the damage of the shear wall material in the core.On this basis,the strong earthquake damage model of a mega-structure with dispersive tubes is explored by studying the energy response of the structure under earthquake.Finally,based on the evaluation criteria of energy,the influence of the key performance parameters of the mega-structure with dispersive tubes on the seismic performance of the structure is studied,which provides a certain basis for the theoretical study of the anti-seismic performance of the structural system.The main researches and conclusions are as follow:(1)In order to evaluate the seismic performance of mega-structures with dispersive tubes under strong earthquakes,a comparative study of the macro-parameters between mega-structure with a dispersive tubes and the frame-core tube structure under different ground motions and the damage of the shear wall material in the core tube was performed.The following conclusions are drawn: Under the premise of providing the same anti-lateral stiffness,the seismic response of the mega-structure with dispersive tubes is smaller than that of the frame-core tube structure.In the damage of the shear wall material in the core tube,the distribution of the core tube concrete compression damage,the mega-structure with the dispersive tubes is more decentralized than the frame-core tube structure,mainly distributed at the bottom of the core tube and near the mega story,ang the degree of damage was slighter than that of the frame-core tube structure,and the frame-core tube structure suffered serious damage,while the giant structure with the dispersion tube suffered only minor damage.From the perspective of controlling the damage of the shear wall in the core barrel,the mega-structure with dispersive tubes is superior to the frame-core tube structure.Therefore,the mega-structure with dispersive tubes can improve the problem of core tube destruction,and can solve the problem of relatively concentrated core tube stiffness,and has good seismic performance.(2)In order to more fully evaluate the seismic performance and damage patterns of the mega-structures with dispersice tubes,the effects of different seismic characteristics on the hysteretic energy dissipation of the structure,the distribution of energy in the structure and the distribution rules of each floor in the structure are studied.The relationship between earthquake energy response and traditional seismic response and damage are established for the distribution of seismic energy among structural layers and components and the energy transfer,distribution,accumulation,transformation,and dissipation between each floor and each component under earthquakes of different strengths,and the structural seismic damage model is determined.Under the action of earthquakes,the mega-structures with dispersive tubes mainly relies on hysteretic energy and damping energy to resist seismic input energy,and the main hysteretic energy of the structure is distributed on the giant floor and the bottom floor of the structure.The damage state of each component in the structure reflects that the yielding order of the mega-structures with dispersive tubes is the first major structure and the latter substructure,and the yield sequence in the main structure is the first mega-beam rear mega-column(dispersion cylinder),the yielding sequence in the mega-beam is the vertical bar and the rear bar.The rationality of the design of mega-structure with dispersive tubes and structural damage mode under strong earthquake are verified.(3)In order to study the impact of the key performance parameters on the seismic performance of the mega-structure with dispersive tubes,the simplified model of the structure is proposed and the lateral stiffness ratio of the primary and secondary structure is derived.The influence of key structural parameters such as the number of spans,stories,main beam column stiffness ratio and secondary stiffness ratio on the structural performance is studied.A reasonable value of lateral stiffness ratio of primary and secondary structure is put forward.The influence of the structural parameters on the seismic performance of the structure of the beam to column stiffness ratio of the main structure is analyzed by the concrete model,which provides a theoretical basis for the study of the seismic performance of the mega-structure with dispersive tubes.