Seismic Performance Of Buckling Restrained Brace RC Frame Based On The Performance Of Joint

Buckling restrained brace as a component to resist lateral force is to overcome the shortcomings of ordinary support which is compression buckling and has good ability of energy consumption.Now it is used in many engineering at home and abroad.Buckling restrained brace the current use for in many steel brace-frame structure,but in the concrete brace-frame structure is less.In recent decades,large earthquakes have occurred many times in the world.There are quite a number of beam-column joints have taken place in structure before the phenomenon of damage structures.Aimed at above problems,in this paper,based on the performance of the joint BRBRCF(Reinforced concrete frame with buckling restrained brace)finite element analysis,mainly considers the brace beam-column joints influenced on the seismic performance of RC frame.Research results show that the brace beam-column joints which are used have good mechanical properties and can be directly used in practical engineering.Consideration the performance of the joint brace framework can improve the simulation precision and more realistic response the structure of the seismic response.This papper mainly has carried on the following work:(1)Using the Pushover analysis and dynamic history analysis method to BRBRCF,this is based on the lateral stiffness ratio method design in OpenSees platform and determinng the scope of the resistance to lateral stiffness ratio.The results show that this method is greatly simplified the steps of the seismic buckling structure design and improve the economic benefits of the structure design,better conform the thought of Performance-Based Seismic Design.(2)Calculation the detailed parameters of the model which is brace beam-column joints.And using the finite element software ABAQUS to analysis the performance of the beam-column joints.The results show that the brace beam-column joints can change the beam-column joints failure pattern and increase the bearing capacity and ductility.At the same time,contrast steel PQ-Fiber material model and the simulation results of double slash constitutive model,can figure out that PQ-Fiber material model can reflect the strength degradation and stiffness degradation of structures.(3)By comparing the joint regardless of the brace frame structure,considering the beam-column joints braced frame structure and the brace beam-column joints braced frame structure seismic performance can know that considering joint seismic performance of the frame can be more realistic response of the structure of the seismic response.At the same time it is much more prove the feasibility of the brace beam-column joints in BRBRCF.(4)Through to the brace beam-column joints in BRBRCF analysis with incremental time history method.Research results show that there is the greatest impact on brace beam-column joints frame in the 10 earthquake seismic waves is Loma Prieta earthquake waves.