Method for detecting using state of multi-span continuous beam of existing railway

Abstract

The invention relates to a method for detecting the using state of a multi-span continuous beam of the existing railway, comprising the following steps of: building a vehicle-bridge dynamic analysis model by applying a dynamic finite element theory, and carrying out analog computation on the dynamic strain value of a bridge when a train passes by taking the irregularity of an actually measured track as excitation and adopting a numerical method so as to obtain the strain control threshold value of a detection point of a support section of the multi-span continuous beam; arranging transducers at least comprising strain transducers on the bottom surface and the side surface of the support section of the multi-span continuous beam of the existing railway, measuring a response signal when the train passes, and processing the response signal to obtain the detection strain value of the detection point of the support section; and when the detection strain value exceeds the threshold value of an envelope curve, sending early warning. The method can be adapted to the conditions of various villainous weathers, extreme environments, and the like, can carry out remote transmission, is convenient to construct by arranging a measure point on the support section and realizes the dynamic real-time automatic long-term detection of the using state of the bridge.

Description

technical field [0001] The invention belongs to a bridge detection method, in particular to a detection method for the use state of existing railway multi-span continuous beams. Background technique [0002] With the continuous improvement of railway speed, weight and density, the impact of train operation on bridges is increasing, especially for 10,000-ton heavy-duty transportation. How to detect the real-time status of heavy-duty existing railway bridges in operation is a practical problem encountered in the development of today's railways. [0003] For a long time, people have attached great importance to the detection of the use status of bridges. However, due to the lack of effective and reliable detection methods, it is impossible to give a comprehensive early warning of the use status of bridges, causing some safety problems such as train derailment and excessive vibration of bridges. Therefore, many scientific research Workers are committed to finding a relatively c...

AI Technical Summary

Problems solved by technology

However, the equipment is expensive and is easily affected by conditions such as rain and fog

[0006] GPS can realize real-time and automatic measurement of bridge dynamics, and has been widely used in highway bridges. However, for railway bridges with high vibration frequency and small deformation, its measurement accuracy and transmission frequency cannot fully meet the requirements of bridge health detection. restrictive

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