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Assessment of Steel Frames with Buckling-Restrained Braces Under Explosive Loading
The existence of terrorist attacks, as well as the unintentional damage to a part of the structure, causes lots of financial and humanitarian disasters. Hence, in this study, 3-, 7-, and 15- story steel frames with a steel moment-resisting frame (MRF) are analyzed and designed. Then, before and after the explosive loading, they are subjected to nonlinear static analyses to compare the structural capacity in two situations. Explosive loads are introduced into the structure in two levels. The frame is retrofitted using buckling-restrained braces (BRBs), and the behavior and capacity of the structure before and after the explosive loads are examined and compared. In analyzing the behavior of structures under explosive loads, the nonlinear behavior of materials, the effects of increasing the coefficient of strain rate of materials, and nonlinearity of geometrical aspects are considered in nonlinear dynamics analyses. The results of the analyses showed that the existence of a BRB system caused a great deal of reduction of stress in different levels. Using the BRBs in the 3-story MRF, the axial force of the facial columns reduced in the frame under the loading level 2% to 66% compared to the MRF. Furthermore, the maximum displacement of roof level in retrofitted frames ranged from 45% to 78% under both blasting scenarios.
Assessment of Steel Frames with Buckling-Restrained Braces Under Explosive Loading
The existence of terrorist attacks, as well as the unintentional damage to a part of the structure, causes lots of financial and humanitarian disasters. Hence, in this study, 3-, 7-, and 15- story steel frames with a steel moment-resisting frame (MRF) are analyzed and designed. Then, before and after the explosive loading, they are subjected to nonlinear static analyses to compare the structural capacity in two situations. Explosive loads are introduced into the structure in two levels. The frame is retrofitted using buckling-restrained braces (BRBs), and the behavior and capacity of the structure before and after the explosive loads are examined and compared. In analyzing the behavior of structures under explosive loads, the nonlinear behavior of materials, the effects of increasing the coefficient of strain rate of materials, and nonlinearity of geometrical aspects are considered in nonlinear dynamics analyses. The results of the analyses showed that the existence of a BRB system caused a great deal of reduction of stress in different levels. Using the BRBs in the 3-story MRF, the axial force of the facial columns reduced in the frame under the loading level 2% to 66% compared to the MRF. Furthermore, the maximum displacement of roof level in retrofitted frames ranged from 45% to 78% under both blasting scenarios.
Assessment of Steel Frames with Buckling-Restrained Braces Under Explosive Loading
Structural Integrity
Fonseca de Oliveira Correia, José António (editor) / Choudhury, Satyabrata (editor) / Dutta, Subhrajit (editor) / Ebadi-Jamkhaneh, Mehdi (author) / Kontoni, Denise-Penelope N. (author) / Ahmadi, Masoud (author)
International Conference on Advances in Structural Mechanics and Applications ; 2021 ; Silchar, India
Advances in Structural Mechanics and Applications ; Chapter: 44 ; 538-551
Structural Integrity ; 26
2022-07-15
14 pages
Article/Chapter (Book)
Electronic Resource
English
Buckling-restrained braces and frames including the same
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BUCKLING-RESTRAINED BRACES AND FRAMES INCLUDING THE SAME
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