buckling restrained brace parametric study under static load cycle

Bracing systems are as a passive control system, an important role of these systems is in building resistance against lateral forces like an earthquake. one of the ways for utilization more and more economical use of the brace capacity is inelastic. conventional braces under tension have good performance, but with buckling under pressure is not goodplasticity (gu et al., 2014). because of its inherent property of buckling restrained braces prevent buckling before that the braces are increased ductility. in this article the behavior of buckling restrained braces under cyclic loading is investigated. because static cyclic loading of the type of hysteresis energy absorption behavior charts with various modelsof three different frames of modeling is used to compare the strengthen brace (yan-lin et al., 2015). in this article, in all hysteresis cycles charts of buckling restrained braced that show also hardening in the elastic range, but at the end of the cycle, it will have plastic brace with declining resistance. this means that the stiffness is reduced from each cycle to othercycle (hoveidae & rafezy, 2012).