The Anti-seismic Performance Analysis Of Steel Reinforced Concrete Frame Supported By Frame-concrete Core Structure

Over the last decade, high-rise hybrid building was universally adopted. At first, the steel frame-concrete core structure was applied mostly common, but the stiffness of the concrete core is much larger than external steel frame, so the seismic performance of them can't act coordinately and reasonably and it maybe not able to play the role of second line of defense under rare earthquakes. Therefore, in the earthquake zone, especially high earthquake intensity regions, this kind of structure were less adopted. Steel reinforced concrete columns were used to increase the properties on tensile, bending and shear of the external frame, to insure that the framework could take a greater overturning moment and shear. So, steel reinforced concrete frame is considered as an ideal form as a second line of defense in framework-concrete core structures. Therefore, in recent years, steel reinforced concrete frame-concrete core structure could be widely seen in china's earthquake zone (especially high-intensity district).In high-rise buildings, transfer story is often set to meet the construction requirements. Girder transfer story is widely used due to its force transferring directly and clearly and easy to be calculated. In recent years, steel reinforced concrete transfer story is applied gradually in actual project, because of its high bearing capacity, good stiffness and high performance on plasticity, durability and seismic performance. So steel reinforced concrete frame supported by frame-concrete structure appeared with a combination of them.The homogeneity of the vertical stiffness is affected after the set of transfer story and the load transmission changes a lot, so it's necessary to make a study to analyze the seismic performance. Therefore, based on the research and study on steel reinforced framework-concrete core structure and transfer story done by predecessors, this paper establishes a three-dimensional calculation modal and adopts finite element analysis, the design software ETABS, to study various aspects on seismic performance of steel reinforced framework-concrete core structure and the general rules of the earthquake response when the height of transfer story and the ratio of equivalent lateral stiffness change. Seismic response of structures includes self-vibration cycle, vertex displacement, story drift angle, the total shear force (moment) distribution of all levels and the internal force distribution of transfer story and frame columns.The paper makes a further analysis on dynamic time-history response of steel reinforced concrete frame supported by frame-concrete core structure in earthquake zone, and in view of the characteristics of dynamic response, pays attention on the settings of transfer story in seismic design, and it also sums up the corresponding effective measures and solutions and proposes design essentials of steel reinforced concrete frame supported by frame-concrete core structure adopted in earthquake zone, which provides references for the design of similar high-rise buildings and ultra high-rise buildings.