High speed railway bridge vehicle-bridge vibration performance safety early warning method

Abstract

The invention discloses a high speed railway bridge vehicle-bridge vibration performance safety early warning method. The method includes acquiring the maximum value of the acceleration response amplitude for each passing train and the corresponding vehicle speed data, pairing the corresponding elements of two sets of sequences, and making an arrangement according to the vehicle sped; decomposing the acceleration response amplitude sequences of a main beam by means of wavelet packet decomposition, extracting the acceleration-vehicle speed median line, and determining the optimal wavelet packet decomposition parameters according to the matching degree of the acceleration amplitude mean of the acceleration sequence within the fixed sequence length; acquiring the fluctuation interval, surrounding the acceleration-vehicle speed median line, of the acceleration amplitude in each subsequence based on an interval estimation theory; and superimposing the acceleration fluctuation interval and the acceleration-vehicle speed median line to obtain the safety early warning interval of the high speed railway bridge vehicle-bridge vibration performance. Compared with the prior art, the method provided has the advantages of comprehensive consideration of factors, accurate and reasonable way, clear physical meaning, easy understanding and implementation, and wide application.

Description

technical field [0001] The invention belongs to the field of structural performance analysis and early warning of high-speed railway bridges, and relates to a safety early warning method for vehicle-bridge vibration performance of high-speed railway bridges, and specifically relates to a safety early warning method for vibration performance of high-speed railway bridges during service. Background technique [0002] High-speed railway bridges are key projects on China's high-speed railway trunk lines. The maximum speed of high-speed trains operating in my country has reached 350km / h. High-speed trains are the main source of excitation during the operation of bridges. focus on. The bridge structure health monitoring system is widely used in the performance monitoring of bridge structures. In order to ensure the normal service of the bridge structure and the driving safety of high-speed trains, my country's high-speed railway bridges are also equipped with structural health moni...

AI Technical Summary

Problems solved by technology

Commonly used methods are as follows: (1) Early warning based on experience: This method sets a bridge vehicle-induced vibration response threshold based on the mechanical knowledge and management experience of bridge designers and managers. When the vibration response exceeds the threshold, an alarm is issued. This method requires practitioners to have rich mechanical knowledge and management experience, and due to the different structural forms of bridges, it cannot be popularized and applied; (2) Early warning based on probability statistics: this method is based on structural response Statistical value of the data, set a maximum warning threshold within a given confidence level, when the vibration response of the bridge structure under the action of the high-speed train exceeds the threshold, an alarm will be given. This method only considers the bridge response parameters, but does not analyze some important parameters (such as (vehicle speed, ambient temperature, etc.), so the early warning value is usually too large, and the practicability is not strong; (3) The early warning method based on the slope change of the correlation curve: this method considers the impact of some parameters (vehicle speed, ambient temperature, etc.) on bridge vehicles. Influenced by the vibration response, the correlation curve between the bridge vibration response and the impact factor is regressed. When the slope of the correlation curve changes, it indicates the change of the service performance of the bridge. Although this method can reflect the performance change of the bridge, the performance change The physical meaning of is not clearly defined, and it is difficult for engineering practitioners to understand

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