A Method for Structural State Evaluation of Simply Supported Girder Bridges for Freight Railways

Abstract

The invention discloses a method for evaluating the structural state of a simply supported girder bridge on a freight railway, which includes obtaining a real-time load value of a target simply supported girder bridge and a real-time monitoring value corresponding to the real-time load value; obtaining a state evaluation interval (η 1 , η 2 ), where η 1 Take the value for the best state; based on the state evaluation interval (η 1 , η 2 ) and the real-time monitoring ratio value η to calculate the status score; generate the status evaluation information of the target simply supported girder bridge based on the status rating. The present invention adopts the ratio coefficient of the measured value and the theoretical value as an indicator for evaluating whether the simply supported beam bridge structure is intact, which can avoid misreporting that the simply supported beam bridge structure bears a large load when the structure is intact, and can also avoid the simply supported beam bridge structure False negatives that occur when bearing loads are small when damaged.

Description

technical field [0001] The invention relates to the technical field of engineering monitoring, in particular to a method for evaluating the structural state of a simply supported beam bridge on a freight railway. Background technique [0002] Simply supported girder bridges are an important part of freight railway lines, and their safety status has always been the focus of engineering personnel. In the normal operation process, vehicle-bridge coupling, material aging of simply supported beam bridges, environmental erosion, accidental natural factors, human factors, etc. will all cause damage to the structure of simply supported beam bridges. If the management and maintenance work is not in place, the long-term development It will lead to the occurrence of structural accidents of simply supported beam bridges. [0003] In the existing technology, engineers have proposed a bridge health monitoring system, which can monitor the environmental indicators and status indicators of...

AI Technical Summary

Problems solved by technology

However, the existing monitoring methods evaluate the state of the bridge based on the measured values ​​of the collected bridges. This method will have the following two problems: (1) When the bridge structure is intact, the monitoring data will be abnormal due to the large load. Misreporting occurs; (2) When the bridge structure is damaged, the damage to the bridge structure is underreported due to the small load

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