Method and device for safety monitoring of small and medium-span prefabricated bridges

Abstract

The invention relates to a safety monitoring method and device for an assembled bridge with a small and medium-sized span, belongs to the technical field of bridge monitoring, and solves the problems in the prior art that the monitoring indicators are not well targeted and the monitoring cost is high. The method includes selecting the first monitoring point, the second monitoring point and the third monitoring point of the bridge to be monitored; respectively measuring and obtaining the strain data at the first monitoring point, the deflection data at the second monitoring point and the Acceleration data, and obtain the transverse correlation coefficient of the adjacent two girders of the bridge to be monitored based on the measured strain data, and obtain the natural frequency of the bridge to be monitored based on the measured acceleration data; the obtained strain The data, deflection data, transverse correlation coefficient or natural frequency are compared with the corresponding preset thresholds to obtain the safety monitoring results of the bridge to be monitored. This method proposes a complete monitoring system for small and medium-span prefabricated bridges, which improves monitoring accuracy and effectiveness while reducing monitoring costs.

Description

technical field [0001] The invention relates to the technical field of bridge monitoring, in particular to a safety monitoring method and device for an assembled bridge with a small and medium span. Background technique [0002] As an important part of expressways, small and medium-span fabricated bridges (mainly referring to fabricated small box girders, T-beams and hollow slab structures) have relatively simple structures, but there are many of them, and their structural safety issues affect the operation safety of expressways. have an important impact. [0003] According to statistics, there are more than 1,000 small and medium-span bridges in the country with insufficient safety and durability, and there are also safety accidents such as bridge collapse. At present, the safety assessment of small and medium-span bridge structures mainly relies on the regular inspections and inspections organized every year as required by bridge maintenance regulations. Due to technical ...

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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a method and device for safety monitoring of small and medium-span assembled bridges, which are used to solve the problem of poor pertinence of monitoring indicators in existing monitoring methods, weak accuracy and effectiveness of monitoring results, and low monitoring costs. high problem

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