Bridge wind-induced behavior nonlinear characteristic analysis method, storage medium and server

Abstract

The invention discloses a bridge wind-induced behavior nonlinear characteristic analysis method, a storage medium and a server, and the method comprises the steps: obtaining the parameters of static wind power, self-excitation force, buffeting force and vortex vibration force based on a large-span bridge nonlinear aerodynamic model; generating different wind field data of the bridge site region based on a harmonic synthesis method and an FFT technology; establishing a three-dimensional nonlinear finite element model of the bridge, loading the nonlinear aerodynamic unit and the wind field datato a main beam unit, and performing coupling dynamic calculation to obtain a nonlinear wind-induced behavior of the bridge in a predetermined wind speed interval; and nonlinear dynamic behavior characteristics of various wind-induced vibrations such as bridge vibration and vortex vibration are analyzed by applying displacement response bifurcations, vibration forms and structure damage modes of the main beams. The method is suitable for analyzing the nonlinear wind-induced behavior of the long-span bridge with different main beam section forms and different structural forms, and is beneficialto revealing the wind vibration mechanism of the long-span bridge.

Description

technical field [0001] The invention relates to the fields of bridge wind resistance analysis and nonlinear dynamic analysis, in particular to a nonlinear characteristic analysis method, storage medium and server for wind-induced behavior of long-span bridges. Background technique [0002] In recent years, strong / typhoons have occurred frequently, which has brought huge loss of life and property to human society, caused a large number of damage and destruction of engineering structures, and seriously affected economic and social activities. In particular, long-span bridges are mainly located in coastal areas, where the wind is generally strong, and there may even be a strong / typhoon frontal attack; with the increasing span of the bridge, the structure of the long-span bridge tends to be gentle, The structural stiffness and damping are reduced, the frequency is lower, and the effect of wind is more sensitive, which leads to the increasingly prominent problem of wind-induced v...

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a method for analyzing the nonlinear characteristics of the wind-induced behavior of long-span bridges, a storage medium and a server, aiming at solving the lack of accurate reflection of various wind-induced behaviors under the bridge-wind interaction in the prior art. The analysis methods of complex aerodynamic nonlinear phenomena, structural nonlinear phenomena, material nonlinear phenomena, etc. lead to the inability to effectively reveal the mechanism of different wind-induced vibrations such as bridge flutter vibration and vortex vibration

Images