A numerical and experimental hybrid approach for the investigation of aerodynamic forces on stay cables suffering from rain-wind induced vibration |
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| Authors: | Hui Li Wen-Li Chen Feng Xu Feng-Chen Li Jin-Ping Ou |
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| Affiliation: | 1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian116024, China;1. Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin, Heilongjiang 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;3. Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA;1. Korea Bridge Design and Engineering Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, South Korea;2. Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, South Korea;1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;2. Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA;3. School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China;4. School of Civil and Hydraulic Engineering, Dalian University of Technology 116024, China;1. Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway;2. National Research Council Canada, Ottawa, Ontario, Canada;3. RWDI Inc., Ottawa, Ontario, Canada;1. NatHaz Modeling Laboratory, University of Notre Dame, Notre Dame, IN, USA;2. Wind Engineering Research Center, Hunan University, Changsha, China;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. Department of Bridge Engineering, School of Civil Engineering, Central South University, China;3. Department of Civil Engineering, Harbin Institute of Technology, Harbin, China;4. Department of Bridge Engineering Southwest Jiaotong University, Chengdu, China |
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| Abstract: | The aerodynamic forces on a stay cable under a rain-wind induced vibration (RWIV) are difficult to measure directly in a wind tunnel test. This paper presents a hybrid approach that combines an experiment with computational fluid dynamics (CFD) for the investigation on aerodynamic forces of a stay cable under a RWIV. The stay cable and flow field were considered as two substructures of the system. The oscillation of the stay cable was first measured by using a wind tunnel test of a RWIV under an artificial rainfall condition. The oscillation of the cable was treated as a previously known moving boundary condition and applied to the flow field. Only the flow field with the known moving cable boundary was then numerically simulated by using a CFD method (such as Fluent 6.3). The transient aerodynamic forces of the stay cable with a predetermined cable oscillation were obtained from numerical calculations. The characteristics of the aerodynamic forces in the time domain and frequency domain were then analysed for various cases. To verify the feasibility and accuracy of the proposed hybrid approach, the transient aerodynamic forces were applied to a single-degree-of-freedom model (SDOF) of the stay cable to calculate the RWIV of the cable. A comparison was performed between the oscillation responses of the stay cable obtained from the calculated (SDOF model) and experimental results, and the results indicate that the hybrid approach accurately simulates the transient aerodynamic forces of the stay cable. The equivalent damping ratios induced by the aerodynamic forces were obtained for various wind speeds. Furthermore, a nonlinear model of the aerodynamic force is proposed based on the calculation results, and the coefficients in the model were identified by a nonlinear least-squares technique. |
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