Hamid Saberi - Assistant Professor, Department of Civil Engineering, University of Eyvanekey, Semnan,
Vahid Saberi - Assistant Professor, Department of Civil Engineering, University of Eyvanekey, Semnan, Iran
Ali Shafiee Neyestanak - Department of Civil Engineering, University of Eyvanekey, Semnan, Iran
Amirreza Sadeghi - Department of Civil Engineering, University of Birjand, Birjand, Iran
Abbasali Sadeghi - Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

The structural systems used in mid-rise buildings are being developed quantitatively and qualitatively to increase their resistance against gravity and lateral forces. Also, extensive studies are being conducted regarding the introduction and application of new structural systems in mid-rise structures in order to improve the behavior of the structure and reduce the risks caused by the effect of lateral forces. In this regard, in recent years, the use of a structural system with a bracing system has attracted the attention of many engineers and researchers. On the other hand, sometimes due to architectural limitations and the inappropriate location of the building, there is a possibility of torsional irregularity in them, and this issue can be seen in most buildings. X, diagonal and chevron (V, inverted V, combination of V and inverted V and combination of X and diagonal) bracing systems have not been done in mid-rise structures. Therefore, in this study, the investigation and comparison of X bracing system, single diagonal bracing and chevron in mid-rise structures is discussed. In order to achieve the goals of this project, a ۱۰-story structure with a combined system of moment frame and X, diagonal and chevron bracing is modelled in ABAQUS software. The obtained results showed that FM۱۰-V-Ʌ-bracing and FM۱۰-Ʌ-bracing models have the best performance in displacement and base shear, respectively in comparison with a reference model. The higher the stiffness of a structure, the less likely it is to damage and destroy its non-structural components due to less plasticity and displacement; But in case of failure, the destruction will be sudden and severe.

seismic behavior, X brace, Diagonal brace, Chevron Brace, Mid-rise structure