Finite Element Analysis Of The Beam Node Of Buckling Restrained Brace Concrete Fame

As a new kind of brace which has stable energy dissipation, remarkable effect of shock absorption, Buckling restrained brace (BRB) has been used in practical engineering in American and Japan.As the first seismic fortification lines,BRB will be yield under compression rather than buckling,which ensure the ultimate bearing capacity and energy dissipation capacity.However, at present BRBs are mainly applied in steel structures, or some reinforced concrete structures which need reinforced. The theory and research on application of BRBs in new reinforced concrete structure accounts for too much less. A node of high performance in BRB fame can make a big different on buckling restrained braced frame.So, the paper is essential for BRBs to be systematic and wildly used in reinforced concrete structure.A beam node at the bottom of a BRBs concrete fame is choosen for researching,the paper propose three new kinds of node for BRBs fames:typical angle beam node,axial angle steel node and axial T-steel,and establish 12 finite element models of new concrete beam nodes for finite element analysis in a reasonable material selection on the basis of constitutive relations and failure criteria. Load-displacement curve, hysteresis curve, skeleton curve, stiffness degradation, and the ductility of node were analyzed under monotonic loading and reciprocating loading respectively, limited bearing capacity of the node, the energy dissipation capacity, failure mode and bearing mechanism of the different nodes are studied. Different parameters impacting the monotonous and hysteretic properties of the node is studied, such as the different nodes form, anchor plate width, the joint plate thickness, spacing of stirrup beside core node and the capacity and original stiffness is study with the changing of parameters.From the finite element analysis results can be obtained, under monotonic loading, Nodes can transfer the axial force of BRB to the concrete beam effectively,the bearing capacity of nodes beyond the design, and strength and ductility can meet the design requirements,which have a good performance. Under reciprocating load, nodes show good mechanical properties,such as a symmetry and full hysteresis curve, a flat degree of degradation,as the same time, have the ability of absorption and dissipation of earthquake energy.From the caculation results,load-displacement curve,hysteretic curve,skeleton curve,rigidity degeneration, node ductility,energy consumption are analysed in different construction. Provide a certain design proposal for the node design. More in-depth analysis of the seismic performance of the new node is studied in the paper.