Behavior of steel oil storage tanks on compressible foundations
Case histories and theoretical analysis were used to study the foundation stability and settlement behavior of tanks on compressible soils. The effects of differential settlements on the performance of both column supported cone roof tanks and floating roof tanks is descirbed and summarized to provide a basis of experience to be used in developing simple and effective procedures for foundation studies on flexible steel oil storage tanks. Data on the stability and settlement behavior of 27 tanks are summarized, and a method for analysis of tank stability, which was found to be applicable to all of the tanks studied is presented. A method of settlement analysis which accounts for shear deformation in the foundation soil has also been developed based on the case history data. Theoretical analyses of tank behavior were used to assess the effectiveness of granular foundation pads to improve foundation stability. It was found that under some conditions a pad improves stability and under others a pad is detrimental. Finite element analyses were used to study trends of settlement behavior observed in the case histories, and to estimate the settlement of a tank representative of 55 very large tanks to be constructed in Japan. Criteria for tolerable bottom dishing settlements and tolerable different settlement around the perimeters of tanks have been proposed by numerous investigators. Their criteria are compared and condensed, and a new simple criterion for tolerable bottom dishing is proposed.
- OSTI ID:
- 7149766
- Country of Publication:
- United States
- Language:
- English
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