Theoretical And Experimental Studies On Isolated High-rise Frame-shear Wall Structures

Frame-shear Wall Structures are widely used in high-rise buildings in our country because of its high lateral stiffness and bearing capacity.With the development of our country’s economic strength and seismic isolation technology,seismic isolation technology is more and more applied to the high-rise frame-shear wall structure,it is very important to carry out further theoretical and experimental research.In this paper,the design theory and experiment of high rise frame shear wall structure are studied,the main research contents are as follows:(1)The PKPM software is used to establish the seismic model of three kinds of high-rise frame-shear wall structures under the seismic fortification intensity of 8 degrees.They are three kinds of seismic design methods,which are the reduction of the seismic action,the reduction of 30% and the reduction of one degree.All the indexes meet the specification requirements.On this basis,the ETABS finite element software is used to performance based seismic isolation design the three kinds of structures and nonlinear time history analysis.The results of the three cases are compared.The results show that the performance based seismic isolation design can be adapted to high performance seismic targets,which is gradually improve the seismic fortification level.(2)ABAQUS software is used to analyze the seismic behavior of high-rise frame-shear wall structures under fortified earthquake,rare earthquake and extremely rare earthquake.The internal force and the displacement between layers are compared,and the damage and energy dissipation are studied.The weak position of the structure and the damage mechanism of the structure are found.(3)The shaking table test of a 4 story steel frame-shear wall structure and isolated structure are carried out in the case of frequent earthquake,fortified earthquake and rare earthquakes with selecting two natural waves and one artificial wave.The experimental resultsshow that the dynamic response of the superstructure is reduced by isolation.Displacement of seismic isolation layer under rare earthquake is 9.918 mm.But it has not reached the 100%shear deformation value of lead rubber bearing.The isolation layer can also be optimized.The experimental values are compared with the theoretical values of MATLAB,the difference between them is not good,and the test results are reliable.(4)This paper presents a direct design method which can be applied to structural isolation design.The design flow chart is given.The iterative method of equivalent damping ratio and equivalent stiffness of isolation bearing is introduced.The current division design method is compared,which is compared with the internal force,displacement and statistics of the amount of steel.The results show that the method can meet the requirements of safety and economy.It turns over the past two stage division design into design directly by one step in place to facilitate the promotion of isolation design.The direct design method introduced in this paper is the recommended isolation design method in "Code of design for seismic isolation buildings".