Early warning method for abnormity of whole lateral load resistance performance of large-span bridge structure

Abstract

An early warning method for abnormity of the whole lateral load resistance performance of a large-span bridge structure comprises the following steps that (1), data acquisition is carried out on the three-dimensional wind field and the GPS displacement effect of the midspan position of a main beam; (2), vector decomposition and mean processing are carried out on the collected data, and static wind speed sequences and static displacement sequences in the transverse direction of the bridge are obtained; (3), the static wind speed sequences and the static displacement sequences are divided according to months, and a main correlation sequence of the static wind speed sequences and the static displacement sequences on the same month is determined by the utilization of wavelet packet cross correlation coefficients; (4), Fourier series fitting is carried out on the main correlation sequences on all the months in sequence, and the abnormity of the whole lateral load resistance performance of the large-span bridge structure is warned easily by the utilization of the month change characteristics of the fitted parameter values. The early warning method for abnormity of the whole lateral load resistance performance of the large-span bridge structure based on the measured wind load effect makes up for the blank in the research on the aspect of the early warning of the abnormity of the whole lateral load resistance performance of the large-span bridge structure and can provide important reference for monitoring and analyzing the whole lateral load resistance performance of the large-span bridge structure.

Description

technical field [0001] The invention relates to an early warning method for abnormality of the overall lateral force resistance performance of a long-span bridge structure based on measured wind load effects. Background technique [0002] The overall lateral force resistance of long-span bridge structures under wind loads is directly related to the normal use and safety performance of the entire bridge structure during operation. During the 100-year design service period, due to the long-term influence of external factors such as climate, environment, and load, the structural materials of bridge components will be gradually corroded, aged, and accumulated damage, which will gradually degrade the overall lateral force resistance of the bridge structure. However, at present, there is little real-time monitoring and analysis of the degradation of the overall lateral force resistance of bridge structures. The overall lateral force resistance of bridge structures is generally con...

AI Technical Summary

Problems solved by technology

However, at present, there is little real-time monitoring and analysis of the degradation of the overall lateral force resistance of bridge structures. The overall lateral force resistance of bridge structures is generally considered to be in good condition at the initial stage of operation. The influencing factor of "degradation of lateral force resistance" is rarely taken into account

It can be seen that the engineering community lacks sufficient understanding of the overall lateral force performance degradation behavior of long-span bridge structures during service, and it is necessary to study the overall lateral force performance degradation analysis methods of long-span bridge structures

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