Vibration monitoring and safety early warning method in bridge rotation process

Abstract

The invention discloses a vibration monitoring and safety early warning method in the bridge rotation process, which comprises the steps of S1, carrying out stress analysis on a bridge to obtain an overturning bending moment borne by the bridge in the rotation process and a condition required when the bridge does not overturn; S2, simplifying the rotation process of the bridge to obtain the relationship between the bending moment caused by the rotation vibration of the structure and the vertical acceleration of the beam end; and S3, on the basis of the steps S1 to S2, obtaining a beam end vertical vibration acceleration limit value in the bridge rotation process, and performing safety early warning according to the beam end vertical vibration acceleration limit value. According to the invention, overall stability monitoring can be achieved, the relation between the vibration monitoring variable and the overall stability in bridge rotation can be effectively established, the overturning danger degree of the structure can be quantitatively reflected, and meanwhile, through the safety early warning technology, the method can be suitable for vibration monitoring in the rotation process of various continuous beam bridges and cable-stayed bridges.

Description

technical field

[0001] The invention relates to the technical field of bridges, in particular to a vibration monitoring and safety early warning method during the rotation of a bridge. Background technique

[0002] With the further upgrading of my country's traffic road network and the gradual increase of over-line projects, the horizontal swivel method has become the first choice for over-line bridge construction due to its characteristics of less interference to existing line traffic and strong site adaptability. However, the bridge is subject to uncertain effects such as gusts and rotation-induced vibrations during the rotation process, which inevitably produces vibration responses. In order to ensure the safety in the process of bridge rotation, it is necessary to monitor the rotation construction of the rotation structure. However, the current mainstream swivel construction monitoring scheme only includes strain monitoring of the control section before and after swivel...

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