Research On Seismic Performance Of High Steel Residental Structure With Buckling-Restrained Brace

A large number of experimental and theoretical research shows that buckling-restrianed brace has stable performance and excellent energy damping effect. This paper use the research ideas of component to overall structure, firstly we conduct finite element analysis of single BRB and BRB subsystems, then study the mechanical properties of BRB in overall structure and compared with general support structure.First, setted up parametric modeling of single BRB with ANSYS Workbench, get its hysteresis curve and compared with ordinary support under static cyclic load. Studied the effect to the mechanical properties gap between the inner core and the sleeve of BRB subsystem, demonstrated the importance of the existence of the gap, given the value method of the gap and compared with general support frame structure which has same cross section area. Under the same cross section area, Compared the hysteretic performance and mechanics characteristics of the in-line core BRB subsystems and cross core BRB subsystems.Then placed the BRB in the overall structure, established BRB high-rise steel residential model with Midas/gen, got its mechanical characteristics under the vertical and horizontal wind load. Got the top floor displacement, acceleration, base shear, hysteresis curve, etc. of the whole structure under frequent earthquake via mode-decomposition response spectrum method and elastic dynamic analysis. Evaluated the seismic performance of overall structure under frequent earthquake and compared with general support high-rise steel residential structure.Capacity curve of BRB high-rise steel residential is obtained via whole structure Pushover analysis, checked structure information of performance point and compared with code limit. Obtained the appearance of location and sequence of the plastic hinge, proved that structure has the ability to resist the rare earthquake.Finally, we conduct dynamic elastic-plastic time history analysis of BRB high-rise steel residential, got top floor displacement, acceleration, inter-story displacement, base shear, hysteresis curve of BRB and compared with general support high-rise steel residential, proved that BRB has superior energy dissipation capacity.