Determining the Appropriate Configuration of FRP in
Retrofitting of Concrete Walls Against Blast Loading
Document Type : Original Article
Abstract
Because of terrorist attacks, the safety of buildings against blast loading are important. As precode structures or existing buildings have designed for gravity or earthquake loads, blast loading ignored, investigation in the rehabilitation of the structure for blast loading is necessary. Sometimes the charge of terrorist has exploded in the near of the structures in the air and makes a critical pressure on the building in the less than one second. One of the elements in structures that subjected to this pressure is building’s wall and must be strengthened and ductile i.e. no crushing manner in explosion loading. There are a lot of methods for strengthening and ductiling for walls and rehabilitation with FRP laminate is appropriate and it doesn’t change the stiffness and mass of structure. In this article, by using the finite element software, ABAQUS, the walls that retrofitted by FRP laminates, subjected to blast loading and verified by experimental data in the literature review and the behavior of traditional configuration investigated. The results indicated that retrofitting by this method, increase the ductility but it couldn’t decrease the midpoint’s displacement of wall significantly and it is investigated that the best direction of the laminates are the same as the steel reinforcement’s design direction.
مبحث بیست و یکم مقررات ملی ساختمان، پدافند غیر عامل، ویرایش اول،1391.##
کریمی، صیاد، ارائه مدلی جدید برای بدست آوردن منحنی تنش-کرنش برای ستون مربعی تقویت شده با استفاده از ژاکت قفسهای فلزی، کارشناسی ارشد، دانشکده عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی،1392.##
A. G. Razaqpur, A. Tolba, and E. Contestabile, “Blast loading response of reinforced concrete panels reinforced with externally bonded GFRP laminates,” Composites Part B: Engineering, vol. 38, pp. 535-546, 2007.##
C. Zhao and J. Chen, “Damage mechanism and mode of square reinforced concrete slab subjected to blast loading,” Theoretical and Applied Fracture Mechanics, vol. 63, pp. 54-62, 2013.##
U. Army, U. Navy, and U. A. Force, “Structures to resist the effects of accidental explosions,” TM5-1300, p. 1400, 1990.##
F. FEMA, “426: Reference Manual to Mitigate Potential Terrorist Attacks Against Buildings-Buildings and Infrastructure Protection Series,” ed: Federal Emergency Management Agency, 2003.##
J. Lubliner, J. Oliver, S. Oller, and E. Onate, “A plastic-damage model for concrete,” International Journal of solids and structures, vol. 25, pp. 299-326, 1989.##
J. M. Adam, S. Ivorra, F. Pallarés, E. Giménez, and P. Calderón, “Axially loaded RC columns strengthened by steel cages,” Proceedings of the Institution of Civil Engineers-Structures and Buildings, vol. 162, pp. 199-208, 2009.##
J. B. Mander, M. J. Priestley, and R. Park, “Theoretical stress-strain model for confined concrete,” Journal of structural engineering, vol. 114, pp. 1804-1826, 1988.##
A. V. Oskouie, S. V. Aminnejad, and Mousa, “Behavior comparison of passive & active frp confined rectangular & wall-like columns,” 1999.##
D. Simulia, “Abaqus 6.11 analysis user’s manual,” Abaqus 6.11 Documentation, p. 22.22, 2011.##
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