Study on Nonlinear Aerodynamic Characteristics of a Semi-Closed Box Bridge Deck Based on Coupled Amplitude Variation

This paper explores the nonlinear characteristics of self-excited aerodynamic forces a semi-closed box deck section to perfect theory aeroelastic response analysis. A numerical wind tunnel model was established based on computational fluid dynamics (CFD) method. The heaving-pitching coupled motion is realized by loading user-defined function (UDF) and dynamic grid technology. varying with amplitude are identified analyzed, reliability results obtained simulation verified in test. In motion, show that forces, especially moment, mainly affected pitching motion. phenomenon high-order harmonic energy transfer observed increase amplitude, main component can be determined amplitude. contribution heaving components small, but its influence complex. Small plays positive damping role scope effect action extreme value lift.