Abstract
Tensile membrane structures (TMS) are light-weight flexible structures that are designed to span long distances with structural efficiency. The stability of a TMS is jeopardised under heavy wind forces due to its inherent flexibility and inability to carry out-of-plane moment and shear. A stable TMS under uncertain wind loads (without any tearing failure) can only be achieved by a proper choice of the initial prestress. In this work, a double-loop reliability-based design optimisation (RBDO) of TMS under uncertain wind load is proposed. Using a sequential polynomial chaos expansion (PCE) and kriging based metamodel, this RBDO reduces the cost of inner-loop reliability analysis involving an intensive finite element solver. The proposed general approach is applied to the RBDO of two benchmark TMS and its computational efficiency is demonstrated through these case studies. The method developed here is suggested for RBDO of large and complex engineering systems requiring costly numerical solution.
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Acknowledgements
The second author (SG) would like to thank Prof. Bruno Sudret, IBK, D-BAUG, ETH Zürich, for his lectures and notes on uncertainty quantification using PCE, and for the licence of the UQLab toolbox.
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Dutta, S., Ghosh, S. & Inamdar, M.M. Optimisation of tensile membrane structures under uncertain wind loads using PCE and kriging based metamodels. Struct Multidisc Optim 57, 1149–1161 (2018). https://doi.org/10.1007/s00158-017-1802-5
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DOI: https://doi.org/10.1007/s00158-017-1802-5