Investigation of the Structural Behavior of Barrel Vault Roofs on the Rigidity of Hinged and Moment Frames

Abstract

The aim of the present research is to investigate the structural behavior of barrel vault roofs on the rigidity of hinged and moment frames. In this study, by numerical modeling using ABAQUS software, a barrel vault roof is modeled on top of one-storey and two-storey structures with hinged and rigid (moment) connections, and is reinforced using cross-bracing methods under and above the roof, using secondary beams and a reinforced concrete slab.In this research, in-plane behavior of barrel vault roof under the vertical force on the roof or the vertical force on the roof beams has been investigated. According to the pushover analysis, a displacement load of about 5 cm is applied to the moment frame structure, and the analysis is performed to examine the stress, displacement, and strain. By around 0/8 seconds, the moment frame structure has completely yielded. There are several reasons for the yielding of the structure: the analysis time remained constant and progressed very slowly, the yield strength of steel materials is defined as 360 MPa, and when the structure's stress is examined, it is observed that the maximum stress has reached 360 MPa, occurring at the beam-column connections. The roof has also experienced severe stress. By performing a linear static pushover analysis on rigid and braced structures, both one-storey and two-storey, and reinforcing with cross-bracing, secondary beams, and a concrete slab, it was found that reinforcement with a concrete slab increases the stiffness of the structure in all cases. The secondary beam reinforcement method is effective in increasing the stiffness of two-storey structures in this study, but has a greater effect on the rigid two-storey structure. The cross-bracing method has no effect on reinforcing the structures.