Abstract
Static and dynamic behavior of above-ground steel storage oil tanks resting on end bearing piles or stone columns are studied and analyzed using ADINA (2019) program. The studied soil profile is an upper soft clay soil layer, followed by an extended dense sand layer. The main purpose of this research is to explore to what extent stone columns can be used as an effective alternative to concrete piles under steel storage tanks. Therefore, many three-dimensional numerical models are conducted to analyze and study the performance of such tanks in both static and dynamic cases. Ten of the studied cases are steel tanks resting over stone columns with different numbers and properties. On other hand, one model studied the behavior of steel tank resting on large diameter concrete piles. Results indicate that stone columns can be used instead of end bearing piles as long as the computed settlements are safe. In addition, stone columns are behaving better than concrete piles in decreasing of hoop stress in tank shell. It is also noticed that stone columns with high elastic modulus are effective in reducing the sloshing height of the oil surface during earthquakes.
Highlights
C oastal areas in many countries suffer from soft clay soils which cause a lot of problems to structures
This study is an initial survey of the issue and focused on the nonlinear dynamic behavior of cylindrical above-ground steel oil tanks resting on Piled-Raft Foundation (PRF) or Stone Columns Foundation (SCF)
I n this section, the behavior of steel storage above-ground tanks founded on either PRF or SCF are studied and analyzed to investigate the extent of stone columns effectiveness as an alternative to supporting the tanks constructed over soft clay soil
Summary
C oastal areas in many countries suffer from soft clay soils which cause a lot of problems to structures. Steel storage tanks resting on soft clay soil is a challenge for engineers because of their relatively higher loads, sensitivity for total and differential settlements, and containing high risk fluids. Concrete piled-raft foundations are mostly used to support steel storage tanks under both static and dynamic cases, there is another economic alternative which is granular columns. Many studies concentrated on the failure of tank itself such as anchorage failure, settlement and shell buckling there is another essential problem occurs during earthquake This problem is the sloshing or leakage of hazardous materials from the tank which may causes fires and environmental damage. This study is an initial survey of the issue and focused on the nonlinear dynamic behavior of cylindrical above-ground steel oil tanks resting on Piled-Raft Foundation (PRF) or Stone Columns Foundation (SCF). Results of settlements; hydrostatic pressure, dynamic settlement, sloshing and hoop stresses are presented
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