investigating the effects of length and cross-section area of the yielding zone of buckling restrained braces on the cyclic behavior of buckling restrained braced frames

The steel braces are known as economically efficient elements for providing lateral stiffness for steel frame buildings. however, their ductility and energy dissipation capacity are quite limited when subjected to seismic excitations. recently, buckling restrained braces (brbs) are being widely used in steel structures due to their high energy dissipation capacitythrough yielding of the core in compression and tension. improving the behaviour of brb frames (brbfs) and reducing the associated construction costs are two important factors, which have attracted the attention of many researchers all around the world. many of the past investigations have looked at the behavior of the brbf, according to its peak andresidual drifts (zarrineghbal, 2015). since brbs are non-prismatic elements (figure 1), the ratio of the area under the plastic zone to that of the elastic zone (α) and the ratio of the length of the steel core to that of the brace (β) are among the most substantial design parameters.