Study On Seismic Mechanism Of Prefabricated Double-opening Steel Plate Partially Constrained Concrete Composite Shear Wall Panel

Steel plate-concrete composite shear wall has mechanical performance advantages as concrete effectively improves the out-of-plane buckling performance of the steel plate and steel plate can well confine concrete to improve its mechanical properties,hence steel plate-concrete composite shear wall is new lateral resistant structural system.However,the concrete of embedded steel plate composite shear wall is easy to crush and fall off prematurely and the concrete crushing in double steel plate-concrete composite shear wall is developing concentrate lately,correspondingly the energy-dissipation capacity of concrete crushing is not effectively developed to alleviate seismic response.To achieve performance-based target as "the optimum coordination between diagonal compression field action of concrete wall and diagonal tension field action of steel plate wall and integration of energy dissipated by concrete crushing and steel yielding",a innovative double perforated steel plate-concrete composite shear wall is put forward,so it is of theoretical significance and engineering guidance value to its study seismic mechanism and construction details.Based on the existing research results of double steel plate-concrete composite shear wall,the design parameters as steel plate opening layout,opening shape,opening size,concrete strength and thickness of steel plate were considered,the commercial finite element software ABAQUS was utilized to establish the mechanical analysis model of innovative type of double perforated steel plate-concrete composite shear wall and numerically simulate under monotonic load and cyclic load,the effects of various design parameters were analyzed and compared.The research results show that:(1)under monotonic load,the double perforated steel plate-concrete composite shear wall has significant effects on the initial lateral stiffness,yield capacity and ultimate bearing capacity about parameters such as concrete strength,thickness of steel plate and opening size of steel plate;(2)under cyclic load,the energy-dissipation mechanism of double perforated steel plate-concrete composite shear wall structural system is affected by parameters such as the shape,layout and the strength of the steel plate,while the concrete strength has a litter effect on it;(3)the double perforated steel plate-concrete composite shear wall fully achieve coordination between diagonal compression field action of concrete wall and diagonal tension field action of steel plate wall to resist shear.Its mechanism is similar as the mechanism of the out-of-plane concrete composite shear wall and the opening measures can significantly improve the energy dissipation damage process of the concrete;(4)combined with the previous analysis and using the existing theory,it proposes the calculation method of the shear capacity of the inclined section for the double perforated steel plate-concrete composite shear wall under the axial pressure,and the calculation results are in good agreement with the model simulation.Related research results provide theoretical reference for further research and engineering applications.