Abstract
The optimization of layout and sizes of the stiffeners in heavy-duty box girder could make this kind of the structure more compact and reasonable, which has certain engineering values. In this study, on the basis of the establishment of parametric finite element model, the function approaching method and gradient search method are combined to form a high-precision optimization algorithm, which makes structural analysis be integrated into the optimization process. The optimization takes the type and location of longitudinal stiffening ribs and the thickness and hole position of transverse diaphragms as design variables, the box girder structural behaviors as constraint conditions, and the total volume as objective function. Finally, the weight is reduced by nearly 7%. More importantly, the new asymmetrical layout of the stiffeners is obtained, the distance between the longitudinal stiffening ribs on the main web and the neutral layer is longer than the distance between the longitudinal stiffening ribs on the secondary web and the neutral layer, and the hole position of transverse diaphragms is close to the secondary web. Compared with the current production of symmetrical layout structure, this layout provides a new idea for the design of stiffeners in the bias-rail box girder.
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Acknowledgments
This research was supported by the National Key R&D Program of China (2017YFC0703906), the Shanxi Provincial Key Research and Development Project (201903D121067), the Fund for Shanxi ‘1331 Project’ Key Subjects Construction (1331KSC).
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Zhang, H., Qin, Y., Gu, J. et al. Layout Optimization of Stiffeners in Heavy-Duty Thin-Plate Box Grider. KSCE J Civ Eng 25, 3075–3083 (2021). https://doi.org/10.1007/s12205-021-2130-2
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DOI: https://doi.org/10.1007/s12205-021-2130-2