Numerical simulation of aerodynamic derivatives and critical wind speed for long-span bridges based on simplified steady wind field
Tóm tắt
Combining the computational fluid dynamics-based numerical simulation with the forced vibration technique for extraction of aerodynamic derivatives, an approach for calculating the aerodynamic derivatives and the critical flutter wind speed for long-span bridges is presented in this paper. The RNG k-ɛ turbulent model is introduced to establish the governing equations, including the continuity equation and the Navier-Stokes equations, for solving the wind flow field around a two-dimensional bridge section. To illustrate the effectiveness and accuracy of the proposed approach, a simple application to the Hume Bridge in China is provided, and the numerical results show that the aerodynamic derivatives and the critical flutter wind speed obtained agree well with the wind tunnel test results.
Tài liệu tham khảo
Chen SR and Cai CS (2003), “Evolution of Long-span Bridge Response to Wind-numerical Simulation and Discussion,” Computers and Structure, 81: 2055–2066.
Cheng J, Cai CS and Xiao RC (2005), “Flutter Reliability Analysis of Suspension Bridges,” Journal of Wind Engineering and Industrial Aerodynamics, 93: 757–775.
Frandsen JB (2004), “Numerical Bridge Deck Studies Using Finite Elements,” Journal of Fluids and Structures, 19: 171–191.
Ge YJ and Tanaka H (2000), “Aerodynamic Flutter Analysis of Cable-supported Bridges by Multi-mode and Full-mode Approaches,” Journal of Wind Engineering and Industrial Aerodynamics, 86: 123–153.
Gu M and Qin XR (2004), “Direct Identification of Flutter Derivatives and Aerodynamic Admittances of Bridge Decks,” Engineering Structures, 26: 2161–2172.
Larsen A (1998), “Advances in Aeroelastic Analysis of Suspension and Cable-stayed Bridges,” Journal of Wind Engineering and Industrial Aerodynamics, 74–76: 73–90.
Larsen A and Walther JH (1997), “Aeroelastic Analysis of Bridge Girder Sections Based on Discrete Vortex Simulations,” Journal of Wind Engineering and Industrial Aerodynamics, 67&68: 253–265.
Larsen A and Walther JH (1998), “Discrete Vortex Simulation of Flow Around Five Generic Bridge Deck Section,” Journal of Wind Engineering and Industrial Aerodynamics, 77&78: 591–602.
Scanlan RH and Tomko JJ (1971), “Airfoil and Bridge Deck Flutter Derivatives,” J. Eng. Mech. Div., ASCE, 97(6): 1717–1750.
Vairo G (2003), “A Numerical Model for Wind Loads Simulation on Long-span Bridges,” Simulation Modeling Practice and Theory, 11: 315–351.
Walther JH and Larsen A (1997), “Two Dimensional Discrete Vortex Method for Application to Bluff Body Aerodynamics,” Journal of Wind Engineering and Industrial Aerodynamics, 67&68: 183–193.
Zhu LD, Xu YL and Xiang HF (2002), “Tsing Ma Bridge Deck Under Skew Winds—Part II: Flutter Derivatives,” Journal of Wind Engineering and Industrial Aerodynamics, 90: 807–837.