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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 46587 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Rahimzadeh Rofooei, Fayaz
- Abstract:
- The on grade flexible steel storage tanks are extensively used in oil refineries, petrochemical plants, power plants and many other municipal utilities. The increasing statistics of various incidents and attacks occurred to these facilities clearly indicates the vulnerability of these strategic installations under the effects of intentional (terrorist) blasts. Therefore, Given the strategic nature of the care and maintenance for these tanks, their damage assessment under the prescribed explosion is quite important. Due to flammable content of some of these tanks, it is necessary to speed up the process of their vulnerability assessment and making the appropriate decisions for any needed strengthening and retrofitting, to prevent any undesirable break out in supplying the market with different oil products. Therefore, special attention should be paid to the blast loading studies and their induced damages on different tanks. By evaluating the inflicted explosion damages to the tanks depending on the explosion magnitude and its distance from the site, prediction and identification of blast damages would be feasible in the shortest possible time interval for any crisis management action. Also, according to the identified damage type and depending on the damage level, general or local retrofitting action could be determined in the least time possible.
In this study the extent of damages to the storage tanks due to different explosions is investigated. In that regard, two on grade ground anchored steel tanks with different dimensions were exposed to six explosion loadings cases with different magnitudes and distances from the blast site. Explosion characteristics are defined according to ASCE 59-11 Code. The dynamic behavior of tanks that presumably contain water, are studied in three different empty , half full and full cases. The nonlinear dynamic analysis of the aforementioned tank models under various loads, are carried out using ABAQUS/CAE software. The obtained results indicate that the tank damage rate is very dependent on explosion severity. Also, the level of damage was higher in reservoirs with lower fluid level. Furthermore, in case of large explosion Intensity, the generated negative pressure (suction) in the upper part of the tank wall, can cause buckling. Also, higher fluid wave height occurred in reservoirs with lower fluid level - Keywords:
- Nonlinear Dynamic Analysis ; Damage Surface ; Aboveground Anchored Steel Tanks ; Blast Effect ; Tanks Damage
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