Effect Of Rigidity Ratio And Height-Width Ratio On Seismic Behavior Of Hybrid Structure Of SRC Frame & RC Core-Wall By Analysis Of Push-Over Method

Hybrid structure of the steel reinforced concrete frame & reinforced concrete core-wall was applied to practical engineering in the high seismic intensity area in our country for its good lateral seismic performance and its well coordinated working performance between sub-structures . Seismic damage and research show that the reasonable stiffness ratio and height-width ratio have large effect on internal force of structure and on distribution of entire deformation of the hybrid structure.In the essay, simplified push-over method was used to explore the laws of stress and deformation of structure under variable stiffness ratio and height-width ratio.In this paper , Hybrid structure of the SRC frame & RC core-wall was analyzed by the push-over method, on the basis of push-over theory. The basic principle, calculation procedure and calculation model of both entire structure and element of push-over method were stated; core-wall was changed into equivalent brace frames of macro model for push-over analyse; and by CSI Section Builder finite element analysis software, steel reinforced concrete columns were full-range analyzed to decide P-M-M interactive surface for plastic hinges in progress. With the SAP2000 non-linear finite element analysis software, the simplified space model of hybrid structure of SRC frame & RC core-wall was established to analyze static elasto-plasticly, and to study the effect of stiffness ratio and height-width ratio on seismic performance of hybrid structure under the existing push-over theory.According to the results, both the stiffness ratio of SRC frame&RC core-wall and the height-width ratio of hybrid structure have effect on the distribution of internal stress and deformation of structure. With the stiffness ratio increasing, the proportion of shear force and that of moment, which frame accounts for, increases, and the same to the angle of displacement. The height-width ratio of hybrid structure effect shear force which undertakes to the frame very small, but effect the proportion of shear force,which undertakes to frame largely; with the height-width ratio of hybrid structure increasing, shear force which core-wall bears remarkably reduces, and the proportion in the total first floor shear force, the frame accounting for, increases. Height-width ratio of core-wall influence the frame moment remarkably; with it increasing, the proportion in total first floor moment, frame accounts for, remarkably increases. Under rare earthquake, SRC frame in hybrid structure effectivly undertakes the partial shear force and moment, and makes internal forces re-distributed. There is good cooperative working performance between the frame and core-wall.