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 good plasticity (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 models of 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 other cycle (Hoveidae & Rafezy, 2012). In this paper, the behavior of non-buckling braces under cyclic loading is considered. Since the loading is a static cyclic type, the behavior of braces (Khampanit et al., 2014). Modeling There is a lot of information frames in the hysteresis diagram. They can be obtained intuitively. The first finding is the level below the graph, which in fact is the amount of energy lost from the loads in the structure. The higher the surface, the greater the structural ductility, the more potential the structure will have on the loss of energy (Kim & Choi, 2004). In this paper, in all of the hysteresis diagrams, in the initial cycles of the non-buckling curvature that is within the elastic range, it exhibits a hardening behavior, but in the end cycles that curtain into the plastic environment, its behavior has a deterioration of resistance. That is, from one cycle to another, its hardness decreases (Razavi Tabatabaei et al., 2014). In addition, in the hysteresis diagram, the slope of the graph decreases in successive cycles (Wanga et al., 2012). In fact, the hardening of the structure is faced with. The reduction of hardness occurs most often in the types of structures that are placed in long loading cycles and enter the plastic range. In all of these hysterical diagrams, we observe a reduction in hardness. In addition to the general behavior of hysteresis diagrams, all models, the models themselves, show the following behaviors in comparison to each other.

Keywords:

Buckling resistance brace , Energy absorption graph , Hysteresis , BRB