Beam bridge integral rigidity evaluation method based on vehicle vibration

Abstract

The invention discloses a beam bridge integral rigidity evaluation method based on vehicle vibration. According to the technical scheme, acceleration sensors are erected on two same vehicles, the twovehicles pass through a bridge to be measured at equal intervals at a constant speed, vertical vibration acceleration information of vehicle bodies of the vehicles in the running process is measured,and an acceleration time travel curve when the two vehicles pass through the bridge is obtained; the vehicle body vertical acceleration values of the two vehicles at the same position of the bridge are subtracted to obtain an acceleration difference time-history curve, then spectrum transformation on the vehicle vertical acceleration difference time-history curve is carried out, and a bridge fundamental frequency measured value in a spectrogram is identified; and the actually measured fundamental frequency is compared with the theoretical fundamental frequency of the bridge to obtain an approximate value of the static load deflection check coefficient of the bridge so as to evaluate the integral rigidity of the bridge. According to the invention, erection of the sensors on the bridge can be avoided, traffic interruption is not needed in the measurement process, the purpose of detecting the bridge without getting off the vehicle can be realized, the test time can be greatly shortened, and the test cost is reduced.

Description

technical field [0001] The invention relates to a method for evaluating the overall stiffness of a girder bridge, which belongs to the technical field of bridge detection. Background technique [0002] In order to reduce the occurrence of bridge disasters, it is necessary to conduct an overall assessment of the bridge's safety status, and the stiffness of the bridge's overall structure, as an important part of the bridge safety status assessment, is an important part of evaluating the bridge's working status. In the current bridge inspection, the deflection calibration coefficient in the static load test is an important parameter to evaluate the safety of the bridge, which directly reflects the bearing capacity of the bridge; the fundamental frequency of the bridge in the dynamic load test is an important indicator that directly reflects the overall structural integrity of the bridge , is closely related to the stiffness and quality of the bridge, and the natural fundamental...

AI Technical Summary

Problems solved by technology

However, these methods often need to interrupt the traffic in the process of applying excitation to the bridge, the test detection efficiency is low, and it is impossible to conduct an overall rapid evaluation of many bridges

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