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Simulation method of wind-induced disaster whole process of long-span bridge

An analog method, a whole-process technology, applied in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2013-07-24
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above superimposed aerodynamic model has the following shortcomings: under the action of turbulent wind, the effects of the static wind force, buffeting force and self-excited force of the main girder actually affect each other, and strictly speaking, they cannot be completely separated and then superimposed

Method used

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  • Simulation method of wind-induced disaster whole process of long-span bridge
  • Simulation method of wind-induced disaster whole process of long-span bridge
  • Simulation method of wind-induced disaster whole process of long-span bridge

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Embodiment Construction

[0041] The technical solution of the present invention will be described in detail below through the drawings and examples, but the protection scope of the present invention is not limited to these examples.

[0042] like figure 1 As shown, the present invention first introduces a unified aerodynamic model, which equates the vibration velocity of the bridge structure to the wind speed of the incoming flow, that is, equates the lateral vibration velocity of the main girder to the wind speed of the incoming flow along the wind direction, and equates the vertical vibration velocity of the main girder to It is equivalent to the wind speed in the vertical direction of the incoming flow; the downwind wind speed and the vertical wind speed are combined into a relative wind speed, and the angle between it and the main girder in motion is called the effective instantaneous wind attack angle, which includes three parts: the initial wind attack angle α 0 , the angle of attack ψ produced ...

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Abstract

The invention provides a simulation method of a wind-induced disaster whole process of a long-span bridge. The simulation method comprises the steps of making the aerostatic coefficients, an effective instant wind attack angle and the relative wind speed integrally working on an aerodynamic force of a main beam, and then carrying out unsteady correction on self-excited force components in the aerostatic coefficients, the effective instant wind attack angle and the relative wind speed; applying aerodynamic force load to a finite element model for carrying out dynamic-history calculation, and carrying out iteration of torsion base frequency and vertical-curve base frequency in different wind speeds; and judging the steady state of a bridge structure under a certain wind speed according to displacement response. According to the simulation method provided by the invention, the integrated calculation of calm-wind instability, buffering and flutter is realized, the defect of independent calculation in traditional wind vibration calculation is overcome, and the accuracy of bridge wind vibration calculation is increased.

Description

technical field [0001] The invention belongs to the field of wind-resistant design of bridges, in particular to a simulation method for the whole process of wind-induced catastrophe of long-span bridges in consideration of the coupling effects of various wind-vibration forms. Background technique [0002] With the advancement of science and technology and the improvement of design level, the world bridge engineering in the 21st century has entered a new era of cross-sea and island construction, and modern bridges are constantly developing towards the direction of growth. The main problem brought about by the large increase in bridge span is the sharp decrease in structural stiffness, which makes the bridge structure more sensitive to wind, so the problem of bridge wind-induced response becomes more and more important. [0003] The whole-process simulation of bridge wind-induced catastrophe aims to use a unified mathematical model to solve the simulation problems of all struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张文明
Owner SOUTHEAST UNIV
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