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Shore bridge structure wind vibration fatigue reliability forecasting method based on probability accumulated damage

A cumulative damage and reliability technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of low prediction accuracy, unable to directly describe the probability characteristics of fatigue cumulative damage, etc., to improve the calculation accuracy. Effect

Inactive Publication Date: 2012-07-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this calculation method is only suitable for the prediction of fatigue reliability of simple wind-resistant structures, and the prediction accuracy is low
In addition, the statistical distribution of fatigue life based on this method cannot directly describe the probability characteristics of fatigue cumulative damage.

Method used

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  • Shore bridge structure wind vibration fatigue reliability forecasting method based on probability accumulated damage
  • Shore bridge structure wind vibration fatigue reliability forecasting method based on probability accumulated damage
  • Shore bridge structure wind vibration fatigue reliability forecasting method based on probability accumulated damage

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and examples. The following examples are implemented on the premise of the technical solutions of the present invention, and detailed implementation methods and specific operation processes are provided, but the protection scope of the present invention is not limited to the following examples.

[0031] see figure 1 , a wind-induced fatigue reliability prediction method for quay bridge structures based on probabilistic cumulative damage, including the following steps:

[0032] S11: Using the harmonic superposition method to simulate the time-domain waveform of the wind load on the quay bridge structure that conforms to the Davenport power spectrum characteristics.

[0033] This step further comprises the steps of:

[0034] First, according to the random vibration theory, the wind speed power spectral density matrix S(ω) of each wind load action point of the quay bridg...

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Abstract

A shore bridge structure wind vibration fatigue reliability forecasting method based on probability accumulated damage comprises the following steps of 1 adopting a harmonic superposition method to simulate wind load time domain wave forms endured by a shore bridge structure and accorded with Davenport power spectrum characteristics; 2 enabling the wind load to act on a finite element model of the shore bridge structure and calculating a stress response time interval of a fatigued calculation point of the shore bridge structure; 3 adopting a rain flow counting method to process the stress response time interval so as to obtain the fatigue statistics characteristics of amplitude stress spectral; and 4 adopting a probability theory method to forecast the wind vibration fatigue reliability of the shore bridge structure in a certain serving period through a probability accumulated damage model. The shore bridge structure wind vibration fatigue reliability forecasting method has the advantages of being applicable to the complex shore bridge structure, wide in application scope, high in computational accuracy, and capable of calculating the fatigue reliability of a wind resisting structure under any random wind load effects.

Description

technical field [0001] The invention relates to a wind-induced fatigue reliability prediction method for a quay bridge structure, in particular to a method for predicting the wind-induced fatigue reliability of a quay bridge structure based on probability cumulative damage. Background technique [0002] The quay crane works on the seaside all the year round, the center of the wind force is high, and the windward area is large. The long-term and intermittent effect of the wind load causes fatigue and cumulative damage to the metal structure of the quay. The wind-induced fatigue reliability prediction method of the quay bridge structure is an important issue in the design and maintenance of the quay bridge structure. Fatigue reliability under wind loads. [0003] In order to solve the above problems, Ou Jinping and others published "Probabilistic Fatigue Accumulative Damage of Structural Wind Vibration" in "Journal of Vibration Engineering" 1993, 6(2): 164-168. In this paper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 董兴建李鸿光孟光
Owner SHANGHAI JIAO TONG UNIV
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