New Double-stage Yield Buckling-restrained Brace Simulation Analysis Research

For the common buckling restraint brace is mostly single-order yielding, and the yield point is single, a new double-order buckling restraint brace is proposed, whose core unit consists of one low yield point core plate and two high yield point core plates in parallel, with the advantages of low yield point, and the buckling restraint brace can yield and dissipate energy under different seismic loads.The new double-order buckling restrained brace was designed by simulating and analyzing with abaqus general finite element analysis software.The working conditions of multi-order failure of the core unit were simulated by using the raw and dead units in abaqus contact, and its energy dissipation performance, skeleton curve, stiffness and other important mechanical parameters were analyzed, and the analysis results were compared with the common single-order buckling restrained brace.The results show that the hysteresis curve of the finite element simulation fits well with the test data, the finite element model design and parameter setting are reasonable, the yielding displacement of the flexural restrained brace is smaller, and it has superior energy dissipation performance under small displacement load, which can dissipate more seismic energy for the structure under small seismic load, and it has greater post-yielding stiffness, which can provide greater reaction force for the brace.