seismic eva‎luation of irregular steel frames equipped with self-centering buckling -restrain braces(sc-brb)s

1/1/1900 12:00:00 AM

Abstract: One of the common structural systems to deal with seismic loads are bracing frames. This structural system has different types, including convergent and divergent braces, which are the 2 main and older types of this structural system that have weaknesses in their performance, so the next generation of braces is called anti-buckling braces. have been formed, which due to their new structure, capable of resisting out-of-plane buckling caused by the application of compressive loads, show better behavior than the previous generations of concentric braces, but these new generation braces that They are known as buckling-free braces (BRB) also have weaknesses in their seismic behavior, and one of the main ones is the large amount of permanent deformation in structures that use this type of braces. Therefore, the latest generation of braces have been formed based on solving this problem, which are known as reversible buckling-free braces (SC-BRB). By adding alloy memory rods to its structure, it improves the seismic behavior of the structure by reducing the amount of permanent deformations and provides the possibility of its optimal use after applying seismic loads. In this research, the structure and behavior of anti-buckling and reversible anti-buckling braces are introduced and investigated, and the effect of their arrangement on the seismic performance of the structure in asymmetrical plans of high-rise structures is investigated and analyzed. And also the behavior of these 2 types of harnessing systems are accurately compared with each other. This research is divided into 5 chapters, the first chapter is the introduction, the second chapter is the introduction and eva‎luation of the seismic behavior of anti-buckling and reversible buckling braces, the third chapter is design and modeling, the fourth chapter is the review and interpretation of the outputs, and the fifth chapter is the conclusion and the next suggestions. becomes The innovation that we have dealt with in this research is to examine the difference in the impact of buckling-proof and reversible buckling braces on the seismic behavior of the structure, as well as the effect of different arrangements of braces in the irregular plan of the structure and determining the optimal arrangement method. be Key words: buckling, buckling avoidance, reversible, arrangement, asymmetric

كمانش , كمانش گريز , برگشت پذير , نامتقارن

buckling , buckling-restrained , braced frame , reversible

mohammad mahdi khoshnood

dr,morteza raeissi