Frequency domain analysis method of bridge fatigue life on the basis of dynamic weighing system

A technology of dynamic weighing system and fatigue life, which is applied in special data processing applications, instruments, electrical digital data processing, etc. It can solve the problems of long calculation time, large amount of stored data, and low accuracy, and achieve long calculation time and simple calculation. , to avoid the effect of loop counting

Active Publication Date: 2015-10-28
TIANJIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, solve the shortcomings of the existing bridge evaluation methods such as low precision, too much stored data, and too long calculation time, and provide a bridge fatigue frequency domain analysis combined with a dynamic weighing system (WIM) method

Method used

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  • Frequency domain analysis method of bridge fatigue life on the basis of dynamic weighing system
  • Frequency domain analysis method of bridge fatigue life on the basis of dynamic weighing system
  • Frequency domain analysis method of bridge fatigue life on the basis of dynamic weighing system

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Embodiment Construction

[0043] The dynamic weighing system (WIM, Weight In Motion) is a set of installed sensors and electronic instruments containing software to measure dynamic tire force and vehicle passing time to provide data such as vehicle weight, vehicle speed, and wheelbase. According to the data collected by the dynamic weighing system of a certain bridge in Tianjin, the specific implementation of the present invention will be described in detail in combination with formulas and drawings.

[0044] figure 1 is a flowchart of the present invention.

[0045] According to the bridge test classification standard, the vehicles are divided into four categories of BCDF, and the measured data are divided into four groups according to the vehicle types, and statistics are made for each group, and the histograms of vehicle speed, vehicle weight and vehicle length are drawn, as shown in figure 2 , image 3 , Figure 4 , Figure 9 shown. Determine the curve fitting method by analyzing the histogra...

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Abstract

The invention relates to a frequency domain analysis method of bridge fatigue life on the basis of a dynamic weighing system. The frequency domain analysis method comprises the following steps: collecting data including the vehicle weight, the vehicle speed and the axle distance of each vehicle which passes through a bridge; calculating the collected data, and carrying out curve fitting; according to a fitting probability density curve, establishing a cellular automata simulation model of the vehicle, and generating a random traffic flow; simulating load time history under different vehicle flow density conditions, and loading the load time history to a bridge influence line to obtain stress time history data; carrying out FFT (Fast Fourier Transform) on the stress time history, obtaining PSD (Power Spectral Density), and calculating relevant parameters; using a Dirlik method to establish an experience form of a PDF (Probability Distribution Function); and calculating residual service life. Calculation time is greatly shortened.

Description

Technical field [0001] The invention belongs to the technical field of bridge fatigue life evaluation. Background technique [0002] Since the reform and opening up, my country's national economy has developed rapidly, and more and more motor vehicles appear on urban bridges and roads, including some heavy and overweight vehicles, which pose a huge challenge to the design life and safety of existing bridges. With the occurrence of bridge fatigue damage more and more frequently, and even the overall collapse of bridge damage due to fatigue, it has aroused the great attention of the traffic management department of our country. [0003] To evaluate the remaining fatigue life of bridges, it is necessary to obtain the stress history through the actual measurement method or the standard method. The actual measurement method to obtain the stress time history is relatively direct and closer to reality. This method is to obtain the stress history of the measuring point for a certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 朱劲松邢雨王祥宇
Owner TIANJIN UNIV
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