Finite Element Analysis On The Joint Of Concrete Fame With Buckling Restrained Brace

Buckling-restrained brace is the emerging energy-consuming components of seismic areas,developing rapidly in recent years.This system of energy dissipation and seismic capacity has been looked excellent around the world.United States,Japan,China and other countries have begun to use it in the actual project at present,the effect is very good.Buckling-restrained brace is typical characterized by compressive yield without buckling,which is the basis for seismic behavior of energy dissipation capacity,through such a system of protection,the building can withstand greater earthquake loads and safety can be greatly improved.However,because the simpleness and convenience of construction,buckling-restrained braces are mostly applied in steel frame structure.Concrete frame with buckling-restrained brace connections are relatively complex,so that the application in concrete frame is less,and mainly in reinforcement of concrete frame.For most developing countries,concrete frame is the main building,and many new buildings need to upgrade on seismic performance,the installation of buckling-restrained brace is necessary.Studying on the mixing of buckling-restrained brace and the concrete frame structure,joint must be an important part of consideration.This article selects three layers of three-span reinforced concrete frame model,installed in herringbone buckling-restrained braces,design two parts include beam joint and beam-column joint as research objects.Beam joints use h-shaped steel horizontally placed,vertical,horizon and h-beam steel anchor plate is lengthened.Through monotonic loading on the three types of joints,get load-displacement curve,analyze the effects of placing way and h-shaped steel anchor plate extension length on properties of joints.Then by changing the anchor plate thickness,h-beam steel rib thickness to determine other factors that affect the behavior.After the analysis and comparison of these details,load repeated loading on beam and beam-column joints.Through the analysis of skeleton curve,hysteresis curve,ductility,stiffness degradation,summarizing the bearing capacity and ductility of the joints,analyze the mechanical way and the destruction of the joints.Through finite element simulation and analysis,it can be seen that three types of beam joints satisfy the requirements.Bearing capacity,ductility,force transmission modes are very reasonable.At the same time,it will be found important factors influencing the behavior of joints after comparing,including h-shaped steel placing form,h anchor plate thickness,the length of the anchor plate.At the time of reciprocating loading,the joint is full of hysteresis curve,indicating good energy dissipation capacity,design on joints of beam and beam-column are safe and reasonable.