Study On Seismic Performance Of Ultra High-rise Building And Placement Optimization Of Damper

Nowadays, most of the structure seismic designs choose the traditional design method,which uses the own performance of the structure to resist the effects of earthquake.Differently, the energy dissipation design, which means install the energy-consumingcomponent to the structure, and under seismic time, the energy-consuming component willdissipate the seismic energy. The passive control method of using viscous damper has a lot ofadvantage, like simple structure, simple construction, easy to maintain, excellent dampingeffect, etc. It has been widely used in Practical Engineering, and proved to be good at Seismicand wind resistance.Ultra high-rise structures have some disadvantages, such as greater rigidity, irregularshape, discrete vertical members, which are unconducive for seismic. If using the traditionalseismic design, the size of the cross-sectional will increasing, and the structure will have agreat vibrations under wind load or tiny earthquake. It will affect the normal use of structure,and increase the project cost. But if using the energy dissipation design, and installing viscousdampers to the structure, it will reduce the size of the structure’s cross-sectional, reduce thestructure’s earthquake response, enhance the seismic performance of the structure, andimprove the comfort level.In this paper, the background of the research is a steel-reinforced frame-core tubeoverrun structure at Xi’an, using the finite element analysis software ABAQUS, to study thedynamic characteristics of the original structure by time history analysis under frequent andrare earthquake. The research find that the structure’s seismic performance compliance withdesign requirements, but there are also some problems like some of the structure section aretoo large, and the dynamic response of Y-direction are too large.Then, choosing the original structure as basis, installing viscous dampers and reduceingthe size of cross-sectional, analyzing the seismic performance of energy dissipation structureand comparing with the original structure, to verify that after installing viscous dampers, thesize of the cross-sectional can be reduced, the earthquake response will be weakened, andseismic performance of the structure will be reinforced.In addition, the paper proposes two layout plans of the damper arrange: in the frame edge,and between the frame and the core barrel. Then analyzing the seismic performance by timehistory analysis under earthquake, and comparing with the original structure. The conclusionshows that when the damper is installed between the frame and the core tube, its performance can be more fully exploited, and obtain more significant damping effect.