Comparative Analysis On Seismic Behavior Of Frame Supported Shear Wall Structure With Different Location Of Transfer Floor

In engineering practice, It is more and more popular that set high-level transfer floor in modern building due to architectural functional requirements. When the location of transfer floor in high-level, the structural stiffness,the internal forces and force transmission route were more susceptible to mutation near the transfer floor. It is detrimental to the seismic design because of the formation of weak layers. So it should be avoided that setting high-level transfer floor in building, especially in seismic design. There is a great deal of research about the frame-supported shear wall structure's seismic behavior both at home and abroad, but mainly based on elastic analysis. Therefore, the thorough research on the high-rise structures with high-level transfer floor has important significance.First, this paper analyzes and summarizes the mechanical and seismic behavior of frame supported shear wall structure, and tests of two one-forth-scale specimens under cyclic load reversals were implemented, comparative analysis on capacity,ductility,deformation characteristics,failure modes of frame supported shear wall structures with different location of transfer floor; Then, based on the finite element analysis simulation of the two test specimens, add 4 Pin single-span frame-supported shear wall structures finite element analysis,to discuss mechanical behavior,deformation characteristics and plastic damage of structure after enhancing the frame supporting layer; Finally, the push-over analysis of the high-rise structures with transfer floor in different condition is conducted, proposes factors that affect the structures'seismic Behavior and the control conditions.The main conclusions of this paper are as follows:①Frame-supporting column is the weak links in frame-supported shear wall structure, the column is shear failure when the structure with low-level transfer floor and is bending failure when the structure with high-level transfer floor. This is necessary to control the column axial compression ratio,flexural capacity and shear capacity in design, and pay attention to improve column shear capacity when the structure with low-level transfer floor and improve column flexural capacity when the structure with high-level transfer floor.②For the frame-supported shear wall structure, enhancing the stiffness of the frame supporting layer is very important, should be strictly control the upper and lower stiffness ratio in design.③Code provides controlling structure's shear stiffness ratio when the structure with low-level transfer floor and controlling structure's equivalent lateral stiffness ratio when the structure with high-level transfer floor is reasonable and necessary.④The main factors affect the seismic behavior of frame-supported shear wall structure is structural stiffness(story drift),the upper and lower stiffness ratio of transfer floor and the height of transfer floor, and the latter two factors cause the mutation of the internal forces and displacement near the transfer floor.⑤Combination of the upper and lower stiffness ratio of transfer floor and the structural stiffness(story drift) to determine the height of transfer floor is more reasonable.