Seismic Optimization Research And Design Method Of Viscous Energy Dissipation Outrigger Truss System

Since the 21 st century,with the vigorous development of my country’s economy,the height of the structure has been increasing,and the threat of super high-rise structures by external seismic loads has also increased.There are two main ways for super high-rise structures to respond to external earthquake loads.The first is to rely on its own stiffness to resist earthquakes,and the second is to introduce anti-seismic technology to overcome rigidity by flexibility.When viscous dampers are widely used in the field of building structures,viscous energy dissipation outrigger trusses using viscous dampers have attracted the attention of the industry and are used in super high-rise structures.Nowadays,the application of viscous energy dissipation outrigger truss system is still in its infancy,the optimization design of viscous energy dissipation outrigger truss system is not thorough enough,so the design still depends on structure finite element software.This paper uses the ETABS structure finite element software to establish a two-dimensional simplified analysis model of the viscous energy dissipation outrigger truss structure system.The simplified model of different energy dissipation outrigger truss parameters under different peak acceleration conditions of earthquakes is carried out by FNA fast nonlinear analysis method.Dynamic time history calculation,and process and analyze the calculation results of key dynamic response indicators.This article mainly completed the following work:(1)For the position optimization analysis of the energy dissipation outrigger truss,by drawing and analyzing the structural dynamic response-position of energy dissipation outrigger truss relationship diagram,the rule of setting one and two energy dissipation outrigger trusses with the optimal position is found,and the dynamic response is different The optimal layout scheme is not the same.(2)For the optimization analysis of the damper parameters of the energy dissipating outrigger truss,by drawing and analyzing the structure dynamic response-damper parameter of energy dissipation outrigger truss relationship diagram,it is found that the energy dissipation outrigger truss controls the structural vertex displacement,the inter-layer displacement and the structural base shear force.The distribution of the better damper parameters in the damping coefficient-damping index two-dimensional coordinate graph is a straight line.(3)A method for optimizing the design of damper parameters for the dynamic response of a single structure is proposed.(4)Taking actual engineering as an example,the position and damper parameters of the viscous energy dissipation outrigger truss of a 500 m super high-rise structure are optimized.In the case of the same damper parameters,move the first energy dissipating outrigger truss up to the 99 th floor,and move the second energy dissipating outrigger truss down to the 76 th and 77 th floors.The damping effect of the optimized structure is compared Before optimization,the maximum displacement of the structure apex was increased by 1.11%,the maximum acceleration of the apex was increased by 2.83%,the maximum interlayer displacement angle was increased by 0.90%,and the maximum base shear force was increased by 0.36%,which proved the viscosity proposed in this paper.The position optimization scheme of the energy dissipating outrigger truss is suitable for the actual three-dimensional structure.Further optimize the design of the energy dissipating outrigger truss damper parameters.Under the optional damper parameter range,under the 7-degree intensity of frequently occurred earthquake condition,the optimal damper parameter for controlling the displacement of the apex of the structure is C =9000 、α =0.3;under the 7-degree intensity of frequently occurred earthquake condition,The optimal damper parameter for controlling the maximum interlayer displacement of the structure is C =9000 、α =0.4;under the 7-degree basic earthquake intensity condition,the optimal damper parameter for controlling the maximum base shear force of the structure is C =9000 、α =0.4.It has been verified that the results of the parameter optimization design method of the viscous energy dissipation outrigger truss damper proposed in this paper are all the optimal damper parameters.