| Composite steel plate shear wall is a new type of lateral force resisting system of the high-rise building structure, and compared with ordinary steel plate shear wall, the steel-concrete composite shear wall has steel plate shear wall as the basic support plate, with unilateral or bilateral outsourcing concrete slab to provide lateral confinement for steel plate, then the buckling of plate can be limited, and the structural anti side stiffness improved, so the steel frame can use the relative economy node of semi-rigid. At the same time, the structure has good ductility and energy dissipation capacity. The semi-rigid steel frame filled with composite shear wall structure is a new type of frame- shear wall structure system which is worth exploring.On the basis of existing research at home and abroad, the paper analyzes the development of steel plate shear wall structure system firstly, then summarizes the improved form of the steel plate shear wall and analyzes their advantages and disadvantages, so leads to the composite steel plate shear wall structure. Through the analysis of the current research status of composite steel plate shear wall, and introduces of the semi-rigid joint, with summarizes of the research insufficiency at home and abroad, putting forward the research structure of this paper:steel frame- infill steel late with unilateral concrete cover composite shear wall, and the UCSW for short.In order to research the hysteretic behavior of the UCSW system, a two-story, one bay steel frame-composite steel plate shear wall specimen was designed and tested under cyclic load. The whole and local performance and force transfer mechanism etc. of UCSW structure were quantitatively analyzed and evaluated according to test data. Experimental results:Failure mode of UCSW: The infilled plate forms fine oblique tension belt,also the fish plate and bolt holes have a partially torn failure; Cracks appear in the reinforced concrete cover plate and the local crushing failure happens at the corner of the corner, and a board shaped indentation appeara in the inside of the contact surface with the plate; The base of steel frame column appears horizontal tear,meanwhile the semi rigid joints and beam column joints form plastic hinges. The structure depends on the deformation of the steel plate tension band, the rotation of the semi-rigid joint, the deformation of the steel frame to absorb and consume earthquake energy, also the reinforced concrete cover plate can be involved in energy dissipation, and the hysteretic performance of the structure is excellent.UCSW structure has higher strength reserve and ultimate load reached 3.10 times than design load, and the structure bearing capacity, stiffness degenerated slowly and has strong stability. The overall ductility coefficient of the structure of UCSW is 5.81,and maximum power dissipation ratio reached 397.08%, so the ductility and energy dissipation capacity is good, and the structure of second layer composite steel plate wall is the main part of deformation and energy dissipation; Lateral force transmission of the UCSW structure through the fish plate, steel rod deformation, deformation of steel frame to complete, within the structure of filled composite wall bear 86%-98% lateral force, and the steel frame bear 70% of the vertical force and overturning moment.In the UCSW structure, reinforced concrete plate as auxiliary components are not directly involved in the anti side, but by constrained buckling deformation and improve the whole performance of steel structure. Through the comparative analysis of each performance index with pure steel plate shear wall test pieces,we can find that the buckling resist ability of UCSW is excellent, then draw multi-wave buckling deformation mechanism of the plate and the anti buckling mechanism of bolt restrict mechanism. Because of the buckling deformation of UCSW was restrained, and the tension field effect was weakened.The failure mechanism of structure changed by the tension mechanism of the ordinary steel plate shear wall to plane stress mechanism, and the direction of tension and compression bearing load at the same time, so the buckling effect is obvious with lateral reinforced concrete cover plates. |
PDF Full Text Request