Study On Seismic Performance Of Assembled RC Frame With Energy Dissipation Joints

The main direction of the development of building industrialization is to promote the popularization and application of prefabricated structure.However,the seismic performance of prefabricated structure has been concerned by the engineering community and the owners for a long time.For the assembled RC frame structure,the seismic performance of the beam column joints is the key to the seismic performance of the whole assembled RC frame.Researchers have been trying to find reliable beam column joints to improve the seismic performance of the structure and avoid brittle failure.In this paper,a kind of assembled RC frame with energy dissipating joint is proposed.The energy dissipating joint is connected by pin axis to form hinge mechanism,which bears vertical and horizontal loads.The rotation of C-shaped soft steel plate outside the energy dissipating joint produces plastic deformation and energy consumption.The replacement of C-shaped soft steel plate after earthquake can quickly restore the function of the structure.With the aid of the finite element numerical simulation method,this paper takes the assembled RC frame with the energy dissipation joint as the research object,analyzes the influence of the parameters such as the lateral support plate,plate thickness and plate material strength on the seismic performance of the structure,and establishes the restoring force model of the energy dissipation joint,which verifies that the design of the energy dissipation node is controllable in the assembled RC frame structure.The main conclusions are as follows:(1)The energy consuming nodes are easy to yield and consume energy,compared with the cast-in-place ordinary RC frame,the assembled RC frame structure with energy consuming joint has better seismic performance.The structural damage is mainly concentrated in the energy consuming joint area,which achieves the seismic design goal of "strong column and weak beam".(2)Setting lateral support plates on both sides of the C-shaped soft steel plate of the energy dissipating joint improves the stability of the C-shaped soft steel plate and the seismic performance of the structure;reducing the thickness of the C-shaped soft steel plate and the lateral support plate reduces the rotational stiffness of the energy dissipating joint,which is easy for the frame to yield energy and play a protective role in the frame;the change of the strength of the plate has little impact on the seismic performance of the structure.(3)The restoring force model of the energy dissipation joint is established by selecting the C-shaped soft steel plate with the optimal parameters,using the theory of small deflection and the theory of post buckling strength,the design parameters of energy dissipation joints are deduced,and the correctness of the hysteretic model is verified.(4)The story displacement angle of the two RC structures meets the limit of the code;compared with the cast-in-place RC frame structure,the yield moment of the beam end is gradually reduced,and the top displacement,story displacement angle and base shear force of the assembled RC frame structure with energy dissipation nodes are reduced under the rare earthquake action.The yield energy consumption of energy consuming nodes is obvious,and the proportion of energy consumption of energy consuming nodes in the total energy consumption of the structure is also increased,so that the design of energy dissipation joint in assembled RC frame structure is controllable.