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

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.