Aseismic Analysis Of Short-leg Shear Wall Structures Supported By 3-d Space Frames With Different Even Beams And Conversion Layer Heights

This paper is based on the research of beam-supported short-leg shear wall transfer structure by team of Shusheng Zhong of Chongqing University,and continues to study the three-dimensional space transfer structure.In frame-supported short-leg shear wall structures,there are few studies on the seismic performance of such transfer structures,such as the height of the cross-section of the even beam connected with the short-leg shear wall and the height of the conversion layer.Moreover,this paper intends to make up for the vacancies in this area and put forward some design suggestions through research.Therefore,SATWE and MIDAS/GEN are used in this paper to discuss the influence of the above two factors on the seismic performance of the whole structure.Firstly,three frame-supported short-leg shear wall structures with different height of even beams are analyzed by MIDAS/GEN and SATWE.The period ratio and mass effective coefficient of the model,lateral stiffness of each floor,shear force of each floor,top displacement,inter-floor displacement and inter-floor displacement angle are obtained.Then elastic time-history analysis and static elastic-plastic analysis(PUSHOVER)are carried out with MIDAS/GEN.In the elastic time-history analysis,the envelope values of the inter-story displacement,the inter-story displacement angle and the shear force of each floor are compared and analyzed.Among them,static elasticplastic analysis mainly examines whether the base shear force at the performance point and the maximum interlayer displacement angle meet the requirements of the code,and observes the plastic hinge order of the model.Then,three structural models with different conversion layer heights are analyzed by mode-superposition response spectrum method,and elastic time-history method is used as supplementary analysis.The main conclusions are as follows: 1.Increasing the height of the even beam can increase the stiffness of the whole structure,but the stiffness ratio of the conversion layer with too large height of the even beam will not meet the requirements of the code.Therefore,this paper verifies that within the allowable span-depth ratio of the even beam in the code,the order of the joints of this kind of transfer structure under rare earthquakes is ideal,which meets the requirements of the concept of seismic design which is "strong wall limb-weak even beam" and "strong column-weak beam".;2.The overall indexes of structural models with different conversion layer heights meet the requirements of the code.Therefore,this paper also verifies that with the increase of conversion layer heights,the overall lateral stiffness of the structure will decrease.For example,the inter-story displacement angle and the stiffness ratio of the conversion layer meet the requirements,and the height of the conversion layer can be increased appropriately.