Research On Seismic Design Method Of Hinged Wall And Frame Structure With Buckling Restrained Braces

Reinforced Concrete Hinged Wall with Buckling-Restrained Brace in base(RCHWBB)is used to strengthen a general reinforced concrete frame structure,forming a Reinforced Concrete Hinged Wall Frame with Buckling-Restrained Brace in base(RCHWBB Frame,RCHWBBF).The RCHWBBF improves the stiffness of the frame structure by maintaining the elasticity of the BRB under service level earthquakes;under design-based and maximum considered earthquakes,the BRB yields and dissipates energy,and the hinged wall controls the drift mode of the frame,avoiding damage to the weak story of the frame and improving the seismic performance of the frame,and the structural function can be quickly restored by replacing the damaged BRB after the earthquake.However,the design method of the weakened bottom hinge wall construction and the influence of RCHWBB construction parameters on the seismic performance of itself and the RCHWBBF are still unclear,and the seismic design method of the RCHWBBF based on energy dissipation and displacement objectives is under-researched.In this paper,the influence of RCHWBB construction parameters on the seismic performance of RCHWBBF is systematically studied from the perspective of the members and the overall structure,using a combination of numerical simulation and theoretical analysis,the law of elastic internal force distribution of hinged wall is analysed,and a displacement-based seismic design of the RCHWBBF is proposed.The main works of this paper are as follows:(1)The theoretical analysis model of RCHWBB is established,and the calculation formula of the top load-displacement curve is derived.Based on the checked calculation formula of RCHWBB skeleton curve,the structural parameters of hinged wall are studied.The construction requirements of bottom weakened hinged wall are clarified when RCHWBB is mainly bending deformation,and the design method is proposed.(2)Static(continuum model and distributed parametric model)and dynamic analysis methods were used respectively to study the distribution laws of the top displacement,shear force and bending moment of the hinged wall in the elastic and elasto-plastic states of the RCHWBBF,as well as the influence laws of the stiffness inhomogeneity of the frame story and the RCHWBB construction parameters on the seismic performance of the overall structure,and based on 3168 models,the effects of β and λ on the displacement and period of RCHWBBF vertices are clarified.(3)Establishing the energy dissipation and displacement design objectives for the RCHWBBF,and deriving the theoretical equations for calculating the structural top displacement about the fundamental period based on the structural base shear force and top displacement curves,and a displacement-based seismic design method for the RCHWBBF was proposed,specifying the structural requirements of the RCHWBBF under the energy dissipation objective and the stiffness requirements under the displacement objective.