Dead-load linear surveying and mapping method for single-span simply supported girder bridge under condition of no traffic interrupting

Abstract

The invention discloses a dead-load linear surveying and mapping method for a single-span simply supported girder bridge under the condition of no traffic interrupting, and relates to the technical field of bridge state detection. The method comprises the following steps: carrying out data acquisition on each detection identification point; carrying out multi-scale wavelet decomposition on the collected low-frequency data in the vertical dynamic displacement time-history curve to obtain a quasi-static component of the time-history curve; obtaining position parameters of the vehicle at the t1 moment and the t2 moment, and determining the vehicle load deflection effect at the t2 moment in combination with the position parameters and the quasi-static components of the identification points; and then obtaining the instantaneous deflection of each detection identification point at the moment t2, and obtaining the dead load deflection in combination with the vehicle load deflection effect atthe moment t2, so that the dead load line shape of the bridge is formed. Under the condition that a single vehicle passes through a bridge, surveying and mapping of the dead-load line shape of the bridge can be achieved, and compared with a traditional / novel static deflection measuring method in the prior art, traffic does not need to be closed, detection is more flexible, easier, more convenientand more efficient, and the detection cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of bridge state detection, and in particular relates to a method for surveying and mapping a dead-load alignment of a single-span simply supported girder bridge under the condition of uninterrupted traffic. Background technique [0002] In this industry, it is necessary to measure the alignment of the bridge regularly to detect the stability and safety of the bridge. This type of measurement is mainly static deflection measurement. In order to detect the safety of personnel and avoid the influence of live load disturbance, it is necessary to test the bridge without vehicle load. Next, some measuring instruments are used to collect elevation data at different positions of the bridge, and the corresponding deflection algorithm is assisted to obtain the deflection of the bridge. At present, the commonly used traditional methods of static deflection measurement include the pendent method, electronic displacement...

AI Technical Summary

Problems solved by technology

[0005] In view of this, an object of the present invention is to propose a dead-load alignment surveying method of a single-span simply supported girder bridge under the condition of uninterrupted traffic, to solve the problem that the bridge static deflection measurement needs to be closed to traffic in the prior art, which is not conducive to measurement. Flexible, efficient and low-cost requirements

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