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Static Uplifting Analysis of Unanchored Ground-Based Cylindrical Steel Tanks
https://orcid.org/http://orcid.org/0000-0002-5502-059X
A simple analytical–numerical approach is proposed to evaluate static uplifting of the bottom plate of unanchored cylindrical tanks due to overturning. In this method, the circular bottom plate is separated from the tank shell and flexural stiffness of the wall is modelled with rotational springs around the circumference of the plate. Distribution functions for the shear forces transmitted from the wall to the edge of the bottom plate are determined using a combination of analytical formulations and numerical analysis. The tank foundation is modelled with tablethe bottom plate with elastic boundary condition resting on nonlinear springs, finite difference method is employed. Maximum uplift and maximum uplifted length obtained from the proposed solution are compared with the experimental values and found to err 6 and 25%, respectively. Also, uplifting analyses are conducted on three large-scale tanks, having different height to diameter ratios and the results are compared with those recommended by the American Standard for Petroleum Tanks (API-650). The comparisons show that for squat tanks (height to diameter ratios less than 0.5), the maximum uplift evaluated by the proposed method is close to the value obtained using the recommended relation in the API-650; however, the API-650 relations substantially overestimate the maximum uplifted length. It is also noted that in taller tanks the API-650 analytical relations give erroneous results for both the uplift and the uplifted length.
Static Uplifting Analysis of Unanchored Ground-Based Cylindrical Steel Tanks
https://orcid.org/http://orcid.org/0000-0002-5502-059X
A simple analytical–numerical approach is proposed to evaluate static uplifting of the bottom plate of unanchored cylindrical tanks due to overturning. In this method, the circular bottom plate is separated from the tank shell and flexural stiffness of the wall is modelled with rotational springs around the circumference of the plate. Distribution functions for the shear forces transmitted from the wall to the edge of the bottom plate are determined using a combination of analytical formulations and numerical analysis. The tank foundation is modelled with tablethe bottom plate with elastic boundary condition resting on nonlinear springs, finite difference method is employed. Maximum uplift and maximum uplifted length obtained from the proposed solution are compared with the experimental values and found to err 6 and 25%, respectively. Also, uplifting analyses are conducted on three large-scale tanks, having different height to diameter ratios and the results are compared with those recommended by the American Standard for Petroleum Tanks (API-650). The comparisons show that for squat tanks (height to diameter ratios less than 0.5), the maximum uplift evaluated by the proposed method is close to the value obtained using the recommended relation in the API-650; however, the API-650 relations substantially overestimate the maximum uplifted length. It is also noted that in taller tanks the API-650 analytical relations give erroneous results for both the uplift and the uplifted length.
Static Uplifting Analysis of Unanchored Ground-Based Cylindrical Steel Tanks
https://orcid.org/http://orcid.org/0000-0002-5502-059X
A simple analytical–numerical approach is proposed to evaluate static uplifting of the bottom plate of unanchored cylindrical tanks due to overturning. In this method, the circular bottom plate is separated from the tank shell and flexural stiffness of the wall is modelled with rotational springs around the circumference of the plate. Distribution functions for the shear forces transmitted from the wall to the edge of the bottom plate are determined using a combination of analytical formulations and numerical analysis. The tank foundation is modelled with tablethe bottom plate with elastic boundary condition resting on nonlinear springs, finite difference method is employed. Maximum uplift and maximum uplifted length obtained from the proposed solution are compared with the experimental values and found to err 6 and 25%, respectively. Also, uplifting analyses are conducted on three large-scale tanks, having different height to diameter ratios and the results are compared with those recommended by the American Standard for Petroleum Tanks (API-650). The comparisons show that for squat tanks (height to diameter ratios less than 0.5), the maximum uplift evaluated by the proposed method is close to the value obtained using the recommended relation in the API-650; however, the API-650 relations substantially overestimate the maximum uplifted length. It is also noted that in taller tanks the API-650 analytical relations give erroneous results for both the uplift and the uplifted length.
Static Uplifting Analysis of Unanchored Ground-Based Cylindrical Steel Tanks
Iran J Sci Technol Trans Civ Eng
Karbaschi, M. E. (author) / Maheri, Mahmoud R. (author)
2022-10-01
17 pages
Article (Journal)
Electronic Resource
English
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