Wide span rail traffic bridge damnification recognition method

A technology for rail transit and damage identification, which is applied in special data processing applications, measuring devices, instruments, etc., can solve problems such as failure to reflect real working conditions and bridge damage identification errors, and improve the accuracy of damage identification, which is easy to implement and reduces The effect of calculation error

Inactive Publication Date: 2008-10-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, when domestic and foreign experts use vehicle-bridge coupled vibration analysis to identify bridge damage, the excitation of the bridge uses moving loads instead of moving vehicles, thus ignoring the impact of vehicle inertia on the bridge; in addition, for rail transi

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  • Wide span rail traffic bridge damnification recognition method
  • Wide span rail traffic bridge damnification recognition method
  • Wide span rail traffic bridge damnification recognition method

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[0031] Below in conjunction with the accompanying drawings, the embodiments of the present invention are described in detail: the present embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed embodiments and specific operation processes, but the protection scope of the present invention is not limited to the following described embodiment.

[0032] The long-span rail transit bridge in this embodiment is a dual-purpose cable-stayed bridge for highway-rail transit, specifically a layout in which the highway and the rail transit are superimposed up and down. Double-cable plane continuous steel truss cable-stayed bridge with tower, truss section is rectangular, all-steel structure.

[0033] This embodiment includes the following specific steps:

[0034] ① Firstly, according to the characteristics of the detected bridge, 33 acceleration sensors are evenly distributed on the longitudinal center axis of the bridge (such as...

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Abstract

The invention relates to a large span rail traffic bridge damage recognition method, including the steps:(1) a sensor is arranged on the bridge which will be examined, the dynamic response signal of a large span rail traffic bridge is measured and is driven by that when a rail vehicle crosses the large span bridge, the signal on the sensor is red by a computer; (2) the benchmark bridge numerical model and the rail vehicle numerical model of the bridge are established; (3) a coupled mechanical analysis system comprising the benchmark bridge numerical model and the rail vehicle numerical model is initialized, an explicit integral method is used to solve the system, the simulated dynamic response signal of the benchmark bridge numerical model on a relative position is red according to the installment position of the sensor; (4) the energy spectrums of the dynamic response signal obtained by monitoring and the simulated dynamic response signal obtained by numerical simulation calculation of the bridge are solved by a multi-scale wavelet packet analysis method, and a damage recognition is carried on by recognizing index. The invention increases the precision of the bridge damage recognition, and the normal use of the bridge structure can not be affected.

Description

technical field [0001] The invention relates to a bridge detection method in the technical field of metrology, in particular to a damage identification method for a large-span rail transit bridge. Background technique [0002] With the advancement of science and technology and the growth of transportation demand, many rail transit bridges or long-span bridges for both road and rail transit (such as: Wuhan Yangtze River Bridge, Nanjing Yangtze River Bridge, Shanghai "Minpu Second Bridge" under construction) has been or will be completed. During the use of these bridges, they are constantly eroded by external environments such as temperature changes, strong winds, long-term repeated effects of vehicle loads, vehicle impacts, and natural disasters such as earthquakes and floods. With the increase of the service life, the structural materials continue to age and the fatigue effect continues to increase, resulting in different degrees of natural cumulative damage and sudden dama...

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Application Information

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IPC IPC(8): G01N19/00G01M7/00G06F19/00
Inventor 杜新光金先龙陈向东张晓敏沈建奇
Owner SHANGHAI JIAO TONG UNIV
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