Research On Cooperative Working And Seismic Performance Of High-rise Diagrid Tube Mixing Structure

As a new and complicated structural system,high-rise diagrid tube mixing structure is composed of the outside diagrid tube and core tube.The outside diagrid tube is composed of two-way cross inclined columns and ring beams.The structural system has the advantages of beautiful construction,efficient force transmission,and significant lateral resistance and has been successfully applied to many typical engineering examples at home and abroad.However,this type of structural system is applied ahead of theoretical research.Moreover,this new type of structural system is lack of mature theoretical research and practical experience in engineering design and seismic performance research.Based on the existing research,the ani-lateral stiffness and interlayer lateral displacement,the cooperative working performance of inner and outer tube,and the transformation and dissipation of seismic energy are studied in this paper.(1)For high-rise diagrid tube,the elastic mechanics model and analysis method was established.The simplified calculation formula of the shear stiffness,the bending stiffness and the vertical stiffness was derived.On this basis,the simplified formula of later displacement of diagrid tube under three kinds of typical loads was deduced,and a simplified formula of equivalent lateral stiffness was given.The inter-story displacement component of this structural system was analysed,and the calculation methods of inter-story displacement was introduced.(2)The high-rise diagrid tube mixing structure was analyzed by Modal Pushover method.The cooperative working performance between diagrid tube and concrete core was explained by analyzing the structure plastic development process,the structural deformation characteristics,the development process of lateral stiffness,and the shear force distribution of the diagrid tube and concrete tube.The shear force distribution of diagrid tube along the height was given.The yield path and the force transmission process of inclined column were clear.The structural seismic behavior was introduced.(3)The high-rise diagrid mixing tube structure was analyzed by elastic-plastic time history analysis method.The distribution regularity of the input energy in all kinds of energy was summarized.The influence of structural parameters and seismic parameters on hysteretic energy and the distribution of hysteretic energy among different structural elements as well as in different stories were studied.The anti-seismic concept was given.