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

A technology of cumulative damage and fatigue life, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of low prediction accuracy

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

[0004] The purpose of the present invention is to provide a probabilistic cumulative damage-based wind-induced fatigue life prediction method for quay bridge structures to solve the technical problem that the existing quay bridge structure wind-induced fatigue life prediction method is only applicable to simple quay bridge structures and has low prediction accuracy

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

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[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 life prediction method for quay bridge structures based on probability 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 bridge structu...

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Abstract

A shore bridge structure wind vibration fatigue life forecasting method based on accumulated damage of probability includes the following steps: step 1 adopting a harmonic superposition method to simulate time domain waveform of wind load borne by a shore bridge structure and according with davenport power spectrum characteristics; step 2 enabling the wind load to be acted on a finite element model of the shore bridge structure, and calculating a stress response time interval of fatigue calculation points of the shore bridge structure; step 3 adopting a rain flow counting process to deal with the stress response time interval so as to obtain fatigue statistical characteristics of amplitude stress spectrum; and step 4 adopting a probability accumulated damage model and a method of a probability theory to forecast wind vibration fatigue life of the shore bridge structure at a certain degree of reliability. The shore bridge structure wind vibration fatigue life forecasting method has the advantages of applying to a complex shore bridge structure, and being wide in scope of application, high in calculating accuracy and capable of calculating reliability fatigue life of a wind resisting structure under the action of any random wind load.

Description

technical field [0001] The invention relates to a wind-induced fatigue life prediction method for a quay bridge structure, in particular to a probabilistic cumulative damage prediction method that can be applied to complex quay bridge structures, has high calculation accuracy, and can calculate the wind-induced fatigue life under a certain degree of reliability. Wind-induced fatigue life prediction method for quay bridge structure. 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 will cause fatigue and cumulative damage to the metal structure of the quay crane. The fatigue life prediction method of wind-induced vibration of quay bridge structures is an important issue in the design and maintenance of quay bridge structures. The design difficulty lies in the lack of fatigue performance test data of materials and the ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 董兴建李鸿光孟光
Owner SHANGHAI JIAO TONG UNIV
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