Experiment Study On Seismic Behavior Of Frame Supported Shear Wall Structures

In recent years, the frame-supported shear wall structures are widely applied in the actual projects, there is a great deal of research about its seismic performance both at home and abroad, but the model experiments on the failure mode and seismic performance of such structures are still less, especially on the frame-supported shear wall structures with high-position transfer and the frame-supported shear wall structures with large chassis. The relevant conclusions based on the numerical analysis remain to be verified and improved further.Therefore, four specimens are designed with a reduced scale of 1∶4 in this paper, and the low-cycle alternation experiment is carried on the frame-supported shear wall structures with different eccentricity shear wall, the frame-supported shear wall structure with different layers of framework, the frame-supported shear wall structure with high-position transfer, and the frame-supported shear wall structures with large chassis. The destruction sites and the failure mode of such structures are researched, the paper analyzes and evaluates the anti-seismic performance of the specimens by the factors such as steel strain, deformation performance, carrying capacity, displacement ductility and stiffness characteristics, at last, and the non-linear load force characteristics were studied.The results of the research indicate that:1,It's difficult to form'strong column weak beam'mechanism in the frame-supported story, the column cap and the column base of frame-supporting column and the frame beam end is the major site of destruction. When only one frame layer, the shear deformation is primary, the failure mode of frame-supporting column is small eccentricity mode. When multi-frame-layer, the bending deformation is primary, the failure mode of frame-supporting column is large eccentric compression mode.2,The deformation performance and the energy dissipation ability of the frame-supported shear wall structures with high-position transfer is better than the structures that the framework have only one layer, but its carrying capacity and deformation capacity are lower than the latter, and the deformation mutation is greater than the latter.3,The lateral displacements of the frame-supported shear wall structures mainly concentrated in the frame-supported framework, the share of the frame-supported framework deformation in the overall deformation is significantly higher than the share of elastic analysis, this phenomenon is particularly detrimental to the structures with high conversion when its deformation is large.4,The podiums of the frame-supported shear wall structures with large chassis showed severe damage, and became a major part in the structural energy dissipation, although the podiums improve the stiffness and bearing capacity of structure, but the failure mode of the main building is no change.5,In order to make the frame-supported shear wall structures to have good seismic performance, we should emphasize on controlling the ratio of equivalent shear rigidity when only one frame layer, and the ratio of equivalent lateral stiffness should be emphasized on controlling when multi-frame-layer.6,In order to prevent an overall collapse of the structures, the bearing capacity of the frame-supporting column should be mainly guaranteed, the frame beam of main building and the podiums are allowed to damage at first in the anti-seismic design of the frame-supported shear wall structures.