Vertical deformation performance degradation alarming method of cable-stayed bridge in operating state

Abstract

The invention relates to a vertical deformation performance degradation alarming method of a cable-stayed bridge in an operating state. The method includes the following steps of sensor arranging, monitoring data processing, building of a relevant mathematical model of girder vertical displacement and operational factors in an intact state, determining of the significance level of a control chart, and cable-stayed bridge vertical deformation performance degradation alarming. In the step of sensor arranging, temperature sensors are installed on the top surface of a girder and the bottom surface of the girder at a midspan position of the cable-stayed bridge and used for monitoring the temperature of the top surface of the girder and the temperature of the bottom surface of the girder, and in addition, a vertical acceleration sensor and a vertical displacement sensor are installed on the top surface of the girder at the midspan position of the cable-stayed bridge and used for monitoring the vertical acceleration of the girder and the vertical displacement of the girder; a temperature sensor is installed at the position of the top of a bridge tower of the cable-stayed bridge; a temperature sensor is installed at the position, where the distance between the cable-stayed bridge and the midspan position is shortest, of the middle of the cable-stayed bridge. According to the method, various factors causing vertical displacement changes of the girder of the cable-stayed bridge in the operating state are completely considered, and therefore the real-time performance and the accuracy of cable-stayed bridge girder vertical deformation performance degradation alarming are effectively improved.

Description

technical field [0001] The invention relates to a degradation alarm method applied to the vertical deformation performance of a cable-stayed bridge in an operating state, and relates to the field of non-destructive testing of bridge engineering. Background technique [0002] During the long-term operation of a cable-stayed bridge, the degradation of the vertical deformation performance of the cable-stayed bridge is directly related to the safe operation of the entire bridge structure. Therefore, it is necessary to monitor and evaluate the vertical deformation performance of the cable-stayed bridge in order to detect its performance degradation as early as possible and give an alarm in time. At present, the detection of the vertical deformation performance of cable-stayed bridges mainly adopts the method of manual periodic detection. This method has the following problems: (1) Manual detection is highly subjective and lacks the accumulation of historical data. (2) The real-t...

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Problems solved by technology

[0004] Technical problem: The present invention aims at the deficiency of existing cable-stayed bridge vertical deformation performance degradation monitoring technology, and proposes a degradation alarm method for the vertical deformation performance of cable-stayed bridges under the operating state, focusing on solving the vertical deformation performance degradation of cable-stayed bridges Real-time and accuracy of alarm

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