جستجوی مقالات مرتبط با کلیدواژه "سیستم قاب خمشی" در نشریات گروه "عمران"

Today explosion in urban centers and residential areas, there is a danger that threatens all buildings. Explosions inside or near a building can cause sudden damage to building frames. Analysis and design of structures under explosive loads requires a precise understanding of the dynamic response of members and systems of structures under this load.In this research, the behavior of three types of flexural joints of reduced type, end plate and reinforced with top and bottom plate in the phenomenon of explosion and progressive failure has been studied and to perform these studies and numerical simulation of ABAQUS finite element software And Etabs (V.NL13) were used.In determining the type of explosion, two parameters are usually decisive: the size of the weapon, which is equivalent to the weight of TNT, and the distance, which indicates the distance from the center of the explosive to the desired volume. In steel structures, there are two types of lateral load-bearing systems: flexural frame system and simple frame system with bracing. In the meantime, the bending joints of the beam to the column are the bridge of this partnership, and if it is destroyed, the structure can suffer a lot of damage. Due to the above explanations and the importance of flexural joints under lateral loads, in this research, flexural joints have been investigated.

The redundancy factor is applied to increase the redundancy of structures that not had a sufficient degree of static indeterminacy in many international standards. The redundancy factor is different in the design standards. In the fourth edition of the standard No. 2800, the redundancy factor is proposed to improve the seismic performance of buildings that are considered with two values 1 and 1.2. Therefore, the base shear can be increased to a maximum of 20%, according to the standard No. 2800. In this paper, the effect of the redundancy factor on the seismic performance of the moment resisting concrete structures is investigated using nonlinear static analysis. Also, the numerical evaluation of the value provided by the standard No. 2800 for the redundancy factor is assessed. The studied models have 4, 6 and 8 stories with a story height h=3.2 m where 1, 2, 3 or 4 bays have to be located. ETABS software used for modeling and analysis. Then, the performance of the structures is evaluated by applying once a redundancy factor 1 and again the redundancy factor 1.2. Based on the results of this research, it can be concluded that it is justified to account directly structural redundancy in the design by using a redundancy factor, as proposed in some international building codes.