The Column Grid Parameters' Effects On Seismic Performance Of Frame Core Tube Structure

Frame core tube structure is a sort of hybrid structures which is composed of frame and shear wall. Owing to that this kind of structure has both of its components' own advantages, and a relatively good mechanical properties will be shown when earthquakes take place, so this type of structure is widely used in high-rise buildings with seismic design requirements.Based on the analysis of the static elastic-plastic and dynamic elastic-plastic performances of eight frame core tube structures, structural behaviors in different column grid parameters via different analyze methods were studied by using finite element analysis software in this article, in order to research the distinct effects on seismic performances of a frame core tube structure when different column grid parameters are adopted, and an optimized suggestion for design was given basing on the result,through which seismic responses' evaluation of these structural models under earthquake have been made form many aspects.By analyzing the frame core tube's base shear-top story drift curves, ultimate story-drift angle,distribution of plastic hinge and law of internal force distribution with different column grid parameters, the seismic performance of the structure influenced by column grid parameters was discussed. Combined with some relative theories, research achievements and comparison are made in order to summarize the general rules that how column grid parameters affect seismic performance of the structure, which will be an reference for theoretical research and engineering practice.The results show that different column grid parameters will have different impacts on the seismic performance of structures. When the inner and outer column net size and spacing changes, vibration period of the structure, the interlayer displacement angle, distribution of plastic hinges and its developing laws, and the internal force's distribution between core tube and frame portion and the like will all change accordingly. The interlayer displacement angle at the story of two or three nearby will have a more significant mutations, while that in the other stories are relatively stable at a certain value. The most of total base shear of the structure is distributed by core tube while only a small part of that is shared by frame, and it is similar as for the distribution of total overturning moment of the structure,but comparatively speaking, the distribution proportion for frame in terms of total base shear increased slightly to some extent, and the change of inner and outer column nets' size and their spacing has a significant impact on the distribution of total base shear.