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A platform for research: civil engineering, architecture and urbanism
Nonlinear Buckling Analysis of Conical Steel Tanks Considering Field-Measured Imperfections—A Case Study
Geometric imperfections caused by fabrication and welding reduce the buckling capacity of steel conical tanks. The reduction is sensitive to the shape and amplitude of imperfections. Many imperfection shapes have been studied in the literature. But few to none considered field-measured geometric imperfections in such type of shell structures. The current paper carries out elastoplastic finite element analyses (FEA) to evaluate the buckling capacity of a full-scale stiffened conical steel water tank by considering its initial imperfections extracted from high-resolution laser scan data. Both global and local initial imperfections on the steel tank are obtained by comparing the laser scan data with the nominal tank geometry. The FEA is implemented using the commercial FEA package ANSYS; a four-node shell element with a six degrees of freedom per node is utilized in the model with a triangular option. The arclength method is applied to evaluate the buckling capacity of the steel tank under the hydrostatic pressure. To validate the finite element model developed in this study, the buckling capacity of a steel water tank in Fredericton, NB is evaluated and compared with those reported in the literature. Results of the case study shed light on the shapes and magnitudes of global and local imperfections in an existing stiffened steel conical tank and their impact on the buckling capacity of the tank. Furthermore, the adequacy of initial imperfections recommended in widely used design standards for steel tanks is examined with comparison between the measured and code-recommended initial imperfections.
Nonlinear Buckling Analysis of Conical Steel Tanks Considering Field-Measured Imperfections—A Case Study
Geometric imperfections caused by fabrication and welding reduce the buckling capacity of steel conical tanks. The reduction is sensitive to the shape and amplitude of imperfections. Many imperfection shapes have been studied in the literature. But few to none considered field-measured geometric imperfections in such type of shell structures. The current paper carries out elastoplastic finite element analyses (FEA) to evaluate the buckling capacity of a full-scale stiffened conical steel water tank by considering its initial imperfections extracted from high-resolution laser scan data. Both global and local initial imperfections on the steel tank are obtained by comparing the laser scan data with the nominal tank geometry. The FEA is implemented using the commercial FEA package ANSYS; a four-node shell element with a six degrees of freedom per node is utilized in the model with a triangular option. The arclength method is applied to evaluate the buckling capacity of the steel tank under the hydrostatic pressure. To validate the finite element model developed in this study, the buckling capacity of a steel water tank in Fredericton, NB is evaluated and compared with those reported in the literature. Results of the case study shed light on the shapes and magnitudes of global and local imperfections in an existing stiffened steel conical tank and their impact on the buckling capacity of the tank. Furthermore, the adequacy of initial imperfections recommended in widely used design standards for steel tanks is examined with comparison between the measured and code-recommended initial imperfections.
Nonlinear Buckling Analysis of Conical Steel Tanks Considering Field-Measured Imperfections—A Case Study
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Zhang, H. (author) / Ansary, A. M. El (author) / Zhou, W. (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 28 ; 295-306
2022-05-18
12 pages
Article/Chapter (Book)
Electronic Resource
English
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