| In recent years,due to frequent earthquakes,the main vertical load-bearing members of reinforced concrete frame shear wall structures are vulnerable to damage,resulting in local and even overall collapse of the structure.In view of this problem,researchers put forward the idea of sliding frame columns on the top of columns,that is,combining with certain measures to reduce or even completely eliminate the bending moment and shear force of some frame columns under earthquakes,At the same time,ensure that this part of the column in the earthquake basically keep intact and can bear most of the weight of the structure alone,so as to better realize the seismic collapse of the structure.Based on this,combined with the special assumption put forward by scholars,this paper applies it to a practical engineering example of reinforced concrete frame shear wall structure,and carries out the influence law of various factors on the seismic performance of sliding frame shear wall structure at the top of column under different seismic waves.The main research contents and analysis results are as follows:(1)In this paper,a nine story frame shear wall structure is taken as the research object,and the static elastic and elastic-plastic analysis of the frame shear wall structure model is carried out by combining with the analysis software.The data of floor displacement,interlayer displacement angle and weak layer are obtained,and the preliminary seismic performance of the frame shear wall structure is evaluated.(2)Based on the dynamic time history analysis method,considering the influence of the actual location and number of shear walls in the frame shear wall structure,three kinds of plane layout schemes of sliding columns are given,and the dynamic response analysis of the sliding frame shear wall structure at the top of each scheme under different seismic waves is carried out one by one,and then the seismie performance of the strueture is evaluated.The results show that the lateral displacement,the displacement angle between floors,the shear force and the absolute acceleration of each floor of the frame shear wall structure with different arrangement of sliding columns are reduced to some extent compared with the original structure;The weak floors of the sliding frame shear wall structure at the top of each column are mainly concentrated in the middle six floors,so measures should be taken to strengthen the structure design;Compared with the original structure,the maximum reduction of floor shear force and floor acceleration of each frame shear wall structure under seismic wave is 30%and 23%respectively,which indicates that the arrangement of sliding columns can effectively reduce the dynamic response of frame shear wall structure and improve its seismic performance.(3)Based on Chi Chi seismic wave and slip column arrangement scheme 1,the frame shear wall structure with only slip columns in weak floors is modeled and analyzed,and compared with the traditional frame shear wall structure.After that,the thickness of shear wall and the strength grade of concrete are changed,and the dynamic response of the structure under earthquake is analyzed quantitatively and qualitatively again.Finally,the seismic capacity of the structure is evaluated comprehensively.The results are as follows:the dynamic response of sliding columns in weak floors is basically the same as that in all floors;By appropriately changing the thickness of shear wall and the strength grade of concrete,the maximum inter story displacement angle of sliding frame shear wall structure at the top of column can be further reduced,which makes the seismic performance of frame shear wall structure more superior under earthquake.(4)According to the research content of this paper,combined with the dynamic response analysis results of column top sliding frame shear wall structure under earthquake action,the influence of sliding column location,shear wall thickness and concrete strength grade on the seismic performance of frame shear wall structure is given mainly from four aspects of structural floor displacement,interlayer displacement angle,floor shear force and maximum acceleration,That is to say,the arrangement of sliding columns can effectively reduce the dynamic response of frame shear wall structure under earthquake,improve the seismic collapse capacity,and make the structure have better seismic performance. |
