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Evaluating of Damages for UnAnchored Surface Tanks under Blast Loadings

Fallahnejad, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50861 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofouei, Fayaz
  7. Abstract:
  8. On Grade steel tanks are widely used in petroleum complexes, refineries, power plants and many urban facilities. Increasing the number of attacks, incident reports and operational events happening in refineries proves the sensitivity of these strategic facilities against various Hazards such as explosion. So, the damage assessment of tanks after the explosion is important for their maintenance and repair.Since some of the tanks containing flammable materials, quick action to estimate the possible damage and required strengthening and retrofitting or disconnecting the input to a plant lifeline is of utmost importance. Therefore, special attention to study the blast loading and the study of its effects on destruction of tanks is required. The purpose of this study is to determine the level of inflicted storage tank damage under blast loading with different intensities and distances. For this purpose, two short and medium unanchored steel tanks containing water considered under six blast loadings. Blast loadings properties are defined based on ASCE59-11. Three levels of empty, semi-full and full tanks are considered. For nonlinear dynamic analysis of tanks, ABAQUS/CAE software is used and their dynamic behavior and failure causes are investigated. The results show that the failure of tanks is highly dependent on the intensity of explosion.It is observed that in tanks with lower fluid levels, significant failures could occure. For weak explosions, full tanks have more uplift than semi-full ones. According to the results, it will be possible to estimate types of damages, based on the explosion intensity, the ratio of empty height to diameter of the tank and its height
  9. Keywords:
  10. Blast Loading ; Tanks Damage ; Nonlinear Dynamic Analysis ; Aboveground Anchored Steel Tanks ; Blast Effect

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