Analysis On Seismic Performance Of Frame-supported Shear Wall Structure Based On Elastic Floor Assumption

Due to the discontinuous of the vertical force transmission component in frame-supported shear wall structure, it results in the stiffness mutation near the conversion layer. And the changing floor have to connect with all kinds of anti-lateral force component to share the force together, not only bear the vertical and horizontal load, but also redistribute the force of the above and under transfer story, which lead to deformation of the changing floor. Transfer beam’s section size is big and the load bearing is strong, the stress state is very complex, and have the strong interaction with the frame-supported shear wall that it supported. The internal force of transfer beam is not only affected by the layout of the structure, but have close relation with the stiffness of shear wall connected with it. Therefore, it is necessary to establish the finite element model in combination with the project example, and study the influence factors of the seismic performance of frame-supported shear wall structure and the internal forces of conversion member based on the elastic slab assumption.This paper firstly outlines the function, characteristics, forms and the research status at home and abroad of transfer story structure, then introduces the theory of seismic analysis that frame-supported shear wall structure and calculation theory that considering the floor deformation effects. Then establishes the overall space model by using the finite element software ETABS combined with the engineering example to analyzes effection of the floor rigid elastic assumption to the seismic performance and the internal force of transfer member of frame-supported shear wall structure. By adjusting the arrangement and stiffness of shear wall linked with the ground, analyzesthe effection of the ground wall to the whole structure and the stress performance of transfer member, and changes the stiffness of frame-supported wall which supported by transfer beam, to study effection of the stiffness of frame-supported wall to the conversion component of stress performance, also analyzes the influence of floor rigid elastic assumption to seismic performance and the force transmission mechanism of high transfer floor when the conversion layer located in different story. And aiming at the mutation of high transfer floor, this paper adopts the wide-flat beam transfer structure, to study its influence on the internal forces of conversion member. Research shows that under the calculation of elastic floor model the story stiffness reduces, and inter-story displacement angle increases because of considering the floor deformation in plane and actual stiffness out of plane. And the effect of the floor rigid elastic assumption on seismic shear force distribution of adjacent floor upper transfer floor is significant. Increasing the wall length of ground wall can slow the mutation of inter-story displacement angle and story stiffness of the floor near transfer floor and can help to reduce the internal force of conversion component. With the increase of the frame-supported wall length, the internal force of conversion component shift gradually to the frame-supported wall, which enhance the combination of pier wall and transfer beam. Floor rigid elastic calculation model have significant effect on the story force distribution of high transfer floor structure. Due to the existion of wide-flat beam, the internal force of the transfer beam is more uniform, the internal force mutation of frame-supporting column slows, and improves the reliability of structure.In this paper, the research conclusions can provide a significant reference for the design and application of frame-supported shear wall structure in the future.