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Method for determining wind-induced vibrating response of long-span bridge structure

A wind-induced vibration and determination method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of inability to accurately calculate the non-stationary characteristics of non-stationary fluctuating winds, simple harmonics do not have attenuation characteristics, etc.

Inactive Publication Date: 2015-01-28
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The simple harmonics used in the Wigner-Ville method do not have attenuation characteristics, and the short-time Fourier transform does not take into account the requirements of both frequency and time resolution. For accurate calculation, there is an urgent need for a time-frequency analysis method capable of higher resolution in both the time domain and the frequency domain

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  • Method for determining wind-induced vibrating response of long-span bridge structure
  • Method for determining wind-induced vibrating response of long-span bridge structure
  • Method for determining wind-induced vibrating response of long-span bridge structure

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Embodiment Construction

[0035] The technical solution of the present invention will be described in detail below through a best embodiment, but the protection scope of the present invention is not limited to the embodiment.

[0036] Such as figure 1 As shown, the fine calculation method of a kind of long-span bridge vibration of the present invention comprises the following steps:

[0037] (1) Determine the sampling frequency f and duration T according to the time history of the wind speed measured during the typhoon process;

[0038] (2) Select Moret wavelet as the wavelet basis function for calculating the evolution spectrum, and calculate the frequency interval △f and time interval △t, respectively:

[0039] Δf=f / 400 (1)

[0040] Δt=1 / f (2)

[0041] (3) Calculate the scale factor sequence a and the translation factor sequence b of the Moret wavelet, respectively:

[0042] a=[a 1 a 2 …a r …a 200 ] (3)

[0043] b=[b 1 b 2 …b j …b m ] (4)

[0044] In the formula, m is the length o...

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Abstract

The invention discloses a method for determining a wind-induced vibrating response of a long-span bridge structure. The method comprises the following steps of: performing continuous wavelet transform under the conditions of different dimensions and different translation in a measured typhoon process, and establishing a wavelet transform result matrix by taking a square of a wavelet transform coefficient module as an element; establishing a coefficient matrix by taking a product of quadratic sums of modules of wavelet time domain functions of two different translation factors as elements; dividing the wavelet transform result matrix by the coefficient matrix to acquire an evolution spectrum weight coefficient matrix; weighting the squares of the modules of the wavelet time domain functions under the conditions of different translation by using the weight coefficient matrix, and summing all weighting results to acquire the fine wind spectrum of the measured typhoon process; and inputting a long-span bridge fine finite element model to acquire a vibrating response of a bridge. The method is simple in process, and the acquired vibrating response of the bridge well meets a practical situation, so that the method can be more reliably applied to a wind-resisting design of an engineering structure.

Description

technical field [0001] The invention relates to a method for determining the vibration response of a long-span bridge, in particular to a method for determining the vibration response of a bridge under the action of a strong (typhoon) wind, and is mainly used in the field of bridge wind engineering. Background technique [0002] Wind-induced response analysis of bridge structures is an important task in the design of long-span bridge structures. Wind load is one of the main loads of long-span bridge structures, and the analysis of wind load characteristics is the basic work of bridge wind engineering. The characteristics of wind load mainly include average wind characteristics (average wind speed and direction, wind speed variation with height) and fluctuating wind characteristics (turbulence intensity, turbulence integration scale, power spectral density function, etc.), where the power spectral density function is fluctuating wind speed The main numerical features of the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 丁幼亮周广东李爱群宋永生
Owner SOUTHEAST UNIV