Research On Definition Method Of Frame Shear Wall Structure On The Slope

Mountain architecture has been widely used in western China due to its unique environmental coordination ability.However,the mechanical properties of the foundation are different from those of the ordinary structure due to the unequal grounding characteristics of the foundation.When the frame shear wall structure system is applied to the mountainous environment,what kind of calculation method is used to define the structure system will be directly related to the economy and safety of the building.The problem has not been studied before.The Design standard of mountain building structure which has been formally promulgated and implemented is only based on empirical judgment and gives a suggestion,which lacks corresponding theoretical support.Therefore,this paper takes the frame-shear structure of mountain falling-floor as the research object,carries out relevant research work and draws the following results:(1)From the perspective of structural deformation characteristics,the lateral displacement of the structure under the action of horizontal force is divided into shear deformation and bending deformation.The secondary first-order analysis is carried out to screen the displacement.In the frame shear wall structure,the bending displacement increases with the increase of floors,while the shear displacement decreases with the increase of floors;(2)In the current code,the ratio of overturning moment of frame part is used as the basis for the definition of structural system,and the resistance method and mechanical method are used for comparative analysis.The former has been used in engineering for many years and is still applicable to the irregular falling structure.The calculation results of the latter are greatly affected by the moment point,and the selection of the moment point position has not been agreed in the industry.Therefore,the resistance method is used as the calculation method of structural overturning moment.(3)In the aspect of stress and deformation,it is found that there is a good agreement between the structure and the ordinary structure with the same number of upper floors,but there is a big difference between the structure and the ordinary structure with the same number of total floors;By changing the number of floors and spans of the falling part of the model,the displacement and stress characteristics under different structural arrangements are studied.It is found that the number of floors and spans of the falling part only has a great influence on the displacement and internal force of the falling part,and the influence on the structure above the sill can be ignored;(4)Based on the elastic state,a method to determine the structure system of frame shear wall in mountainous area is proposed: cut the upper ground plane,take the upper part of the sill as the part of the structure checking calculation,and determine the overturning moment of the frame according to the current code;(5)Under the action of rare earthquake,only a small number of beams are slightly hinged in the floor falling part,which can be considered to meet the requirements of fortification intensity.When the overturning moment ratio of the frame on the sill exceeds 80%,this kind of structure should be judged as frame structure from the analysis of lateral deformation characteristics,maximum inter story displacement angle,member yield order and other aspects,which verifies the accuracy of the judgment method in this paper.