Seismic Behavior Researches On The Box-type Transfer Storey With The Top Short-Leg Shear Walls Structure

Short-leg shear wall is an intergradation structure style between erose-section-column frame and conventional shear wall structure. Box-type transfer storey with short-leg shear wall is a frame supported structure to meet the needs of architectural requirements. The top short-leg shear walls can be arranged freely and the box-type transfer storey is proved to be preferable for its special mechanical behaviors, so that such kind of structure have been used to some projects and received better economic and social benefits. However, theory research of this structure is still waiting for exploration and improvement. Short-leg shear wall and box-type transfer storey are studied in this thesis and as followings:1. Horizontal cycle loading experiments are carried on six short-leg shear wall specimens, including two groups of different ratios of shear wall's length to thickness with and without flanged-wall. Failure modes and failure mechanism of the specimens are studied. The hysteretic curve and skeleton curve are given. Characteristic loads and evolution process of train of the specimens are discussed.2. Discrete mode and distributed mode of the short-leg shear wall are made and calculated. Skeleton curves and stress contours are draw and contrasted with the experimental result. The modeling method that close to the experimental result better then be selected to mad finite element modes with different axial compression ratio and span-depth ratio. The distribution of stress under ultimate load, vertical strain curve of the limb and skeleton curve are discussed. Effects of the axial compression ratio and span-depth ratio to the mechanical character and force distribution of the shear wall then be given.3. Based on a project of Wuhan Fruit-lake Building, different finite element analysis software are used to establish a FE model of the whole building and a part entity model a part entity FE model f the box transfer storey with the top short-leg shear walls. Using model analysis and seismic response spectrum analysis, the vibration characters of the model were revealed and analyzed. Factors, including mass, thickness and rigidity of the transfer storey, which affect the seismic resistance behavior of the structure, are analyzed. Changes of the vibration and mechanical characters of the structure with different altitude of the transfer storey are studied. The stress distribution within the transfer storey structure and the stress transfer between the transfer storey and its adjacent top and lower stories under the action of horizontal displacement combined with constant gravity load. are clarified. Some beneficial advices are also forwarded for the design of this key structural component in high-rise building.