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Effect of FRP composites on buckling capacity of anchored steel tanks

  • Al-Kashif, M.A. (Department of Engineering, Cairo University) ;
  • Ramadan, H. (Department of Engineering, Cairo University) ;
  • Rashed, A. (Steel Structures and Bridges, Structural Engineering Department, Cairo University) ;
  • Haroun, M.A. (Dean of Engineering American University)
  • 투고 : 2009.11.26
  • 심사 : 2010.08.18
  • 발행 : 2010.07.25

초록

Enhancement in the seismic buckling capacity of steel tanks caused by the addition of fiber reinforced polymers (FRP) retrofit layers attached to the outer walls of the steel tank is investigated. Three-dimensional non-linear finite element modeling is utilized to perform such analysis considering non linear material properties and non-linear large deformation large strain analysis. FRP composites which possess high stiffness and high failure strength are used to reduce the steel hoop stress and consequently improve the tank capacity. A number of tanks with varying dimensions and shell thicknesses are examined using FRP composites added in symmetric layers attached to the outer surface of the steel shell. The FRP shows its effectiveness in carrying part of the hoop stresses along with the steel before steel yielding. Following steel yielding, the FRP restrains the outward bulging of the tank and continues to resist higher hoop stresses. The percentage improvement in the ultimate base moment capacity of the tank due to the addition of more FRP layers is shown to be as high as 60% for some tanks. The percentage of increase in the tank moment capacity is shown to be dependent on the ratio of the shell thickness to the tank radius (t/R). Finally a new methodology has been explained to calculate the location of Elephant foot buckling and consequently the best location of FRP application.

키워드

참고문헌

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피인용 문헌

  1. Numerical evaluation on shell buckling of empty thin-walled steel tanks under wind load according to current American and European design codes vol.95, 2015, https://doi.org/10.1016/j.tws.2015.07.007
  2. Experimental and Numerical Investigation of Elephant Foot Buckling and Retrofitting of Cylindrical Shells by FRP vol.20, pp.4, 2016, https://doi.org/10.1061/(ASCE)CC.1943-5614.0000640
  3. Strengthening effects of spiral stairway on the buckling behavior of metal tanks under wind and vacuum pressures vol.106, 2016, https://doi.org/10.1016/j.tws.2016.05.023