Aerodynamic admittance functions and buffeting forces for bridges via indicial functions |
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| Institution: | 1. Department of Mechanical Engineering, Technical University of Denmark, Building 403, DK-2800 Kgs. Lyngby, Denmark;2. COWI Consulting Engineers and Planners A/S, Denmark;3. Computational Science and Engineering Laboratory, ETH Zürich, Clausiusstrasse 33, CH-8092 Zürich, Switzerland;1. Department of Architecture, Geology, Environment and Constructions, University of Liège, Quartier Polytech 1, Allée de la découverte 9, B-4000 Liège, Belgium;2. Department of Civil, Chemical and Environmental Engineering, University of Genova, Via Montallegro 1, 16145 Genova, Italy;1. Bauhaus University Weimar, Chair of Modelling and Simulation of Structures, Marienstr. 13, Weimar, 99423, Germany;2. Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, Milan, 20156, Italy;1. State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2. Department of Infrastructure Engineering, University of Melbourne, VIC 3010, Australia;3. School of Civil Engineering, The University of Sydney, NSW, 2006, Australia;1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, 610031, China;2. CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology, Hong Kong, China;1. Dipartimento di Meccanica, Politecnico di Milano, Via La Masa 1, Milano, Italy;2. Società Stretto di Messina, Via Marsala 27 Roma, Italy |
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| Abstract: | Buffeting forces on bridge decks are commonly modelled by Sears’ function. However, it is well known that Sears’ function is reliable only for very streamlined bridge deck sections and that a complete model would require a suitable formulation of buffeting forces in time domain. In this paper, self-excited and buffeting loads are modelled by means of indicial functions. Corresponding aerodynamic admittance functions are numerically evaluated for rectangular sections and compared with experimental and analytical results. A complete time-domain model for cross-sections including vertical turbulence is presented. Numerical simulations are performed on a sample rectangular section. Comparison with experimental results and relevant flutter analyses are also discussed. |
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