The Seismic Response Analysis Of The Steel Frame-Concrete Core Structure With Outriggers

High buildings of our country grows vigorously in recent years, and their characteristics are higher height, more complicated forms, more complete functions and better comprehensiveness. With the development of the high-rise building height, the influence of lateral force has become relatively stronger and lateral distortion has become larger and larger, so the lateral loads become more important in the structural analysis and design. When the steel frame-concrete core structure is not so strong, the refuge story and facility story with the reasonable horizontal cantilevers should be considered to form the high-rise building having outriggers. But settings of outriggers will result in the sudden variation of structural stiffness and internal force, and will come into being weak story. The yield mechanism will difficultly form"strong column, weak beam"and"strong in resistance of shear force, weak in resistance of bending moment".At present many theories about the best location and numbers of outriggers are put forward with the steel frame-concrete core structure with outriggers betaken in many places of the world, but these conclusions are mostly based on the plane model and supositions,so it is necessary to study the outriggers based on three-dimensional models.In this paper, based on three-dimensional models, seismic response of the steel frame-concrete core structure with outriggers are researched based on the research results achieved by former researchers with the finite element analysis software (ETABS). As the results of a large number of analyses and comparisons, seismic response of the location, quantity, stiffness of the outriggers and connection forms are presented in detail and some design concepts are suggested for reference in the structural design of complicated tall buildings. The main seismic response is introduced, including low level period, top displacement, layer displacement angle, internal force of the steel column and so on. The design outlines of the steel frame-concrete core structure with outriggers are presented in the seismic region. A serials of problems are put forward in aseismatic design, and some effective measures and solutions are supplied, and design suggestions are proposed on putting up outriggers to high-rise structures, which brings forward effective basis and very good reference function to the similar high buildings and skyscrapers in aseismatic design.