| Concrete-filled square steel tube-steel plate shear walls structure as a new economic and effective system for lateral-force resisting, is widely concerned by researchers at home and abroad. The diagonally stiffened steel plate shear wall(DS-SPSW) can increase the initial stiffness and postpone the buckle, restrain the out-of plane deformation with improving the mechanism of the structure. Experimental tests and finite element analysis were used to investigate the structure's seismic behavior,mechanism properties and design method. The main research contents and results are as follows:1.Pseudo static tests on two thin steel plate shear walls specimens with concrete filled steel tube frames were conducted, one of them is with diagonal stiffeners and the other one is unstiffened. The bearing capacity, stiffness, ductility and energy dissipation performance of structure is analyzed. Experimental results show that the concrete-filled square steel tubular frame-thin steel plate shear walls has high bearing capacity, lateral stiffness, good ductility and energy dissipation performance, the interaction between frame and thin steel wall, give full play to the performance of the two respective.Concrete filled square steel tubular frame provides a reliable guarantee for play in the post buckling strength of thin steel plate shear wall, can make the structure of the formation of the "destruction" of steel plate shear wall frame before the ideal failure mechanism, realize the double seismic fortification target. Inclined stiffener can improve the steel plate shear wall buckling load, ultimate load and energy dissipationcapacity, reduce the respiratory effect "and the steel plate wall deformation. Inclined stiffener at the intersection of the stress concentration and welding defects of steel plate shear wall is easy to premature tear, give full play to influence the performance of steel plate shear wall.2.Using the finite element software ABAQUS to simulate the process of stress development, the specimen failure mode and plastic deformation development of the specimens. The analysis show that the set of inclined stiffeners can effectively improve the steel plate wall stress, reduce the steel plate wall deformation, increase the tension field angle so that the steel plate wall play a better role.3. The finite element buckling analysis of a series of which aspect ratio is 1diagonal stiffened thin steel plate shear wall is carried out. Research shows that, the buckling forms and the inclined stiffener thickness ratio and stiffness ratio of stiffener on. Appropriate selection of stiffener thickness is relatively small, the steel plate shear wall with out of plane deformation plays a restraining role well, inclined stiffener is not easy to make the compression instability.4. Modified the Calculation diagram of multi-story steel plate shear wall to correct the design of section size of beam and column. Finite element analysis results showed that the modified design lead to ideal damage pattern. Based on the formulas, the influence of existence of the was investigated and the results show that overturning moment occurs premature yield at the bottom of the column, the design can be considered as far as possible the steel plate shear wall thickness ratio greater than 1,which can effectively reduce the column bottom overturning moment. |
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