Method for measuring dynamic deflection of bridge

Abstract

The invention discloses a method for measuring the dynamic deflection of a bridge. The method includes steps of determining deflection measured points according to the structural type of the bridge, and mounting pressure transmitters and acceleration sensors at the various measured points; collecting data of pressures of liquid in a communicating tube at the various measured points and acceleration data of the various measured points; enabling a data processing unit to receive the data and process the acquired data according to a first data model to obtain the dynamic deflection of the various measured points. The method for measuring the dynamic deflection of the bridge has the advantage of high bridge dynamic deflection measurement accuracy.

Description

technical field [0001] The invention relates to bridge data measurement technology, in particular to a method for measuring bridge dynamic deflection based on the principle of a pressure field connecting pipe. Background technique [0002] Bridge deflection is an important index to evaluate the safety and applicability of bridges. At present, various health monitoring systems have been applied to the deflection monitoring of bridges at home and abroad. The monitoring methods are divided into two categories: static measurement and dynamic measurement. Static measurement usually uses theodolites, levels, dial indicators, etc. to measure the deflection of bridges, because it is difficult to accurately reflect the safety and operation status of bridges under the dynamic load generated by vehicle traffic, and cannot meet the needs of long-term automatic deflection monitoring. Dynamic measurement is a real-time and online monitoring of bridge deflection, which can accurately refl...

AI Technical Summary

Problems solved by technology

However, a key problem of this method is that as the bridge structure vibrates under the action of operating loads (such as when large vehicles pass on the bridge), the connecting pipes fixed on the beam body will also vibrate accordingly, especially when the When there is an elevation difference in the point-connected pipe, the vibration acceleration of the structure will inevitably generate a large additional pressure in the pipe, which will seriously affect the measurement accuracy of the structure

The existing public results can only obtain the static deflection value of the bridge structure defined above, without considering the influence of additional pressure caused by acceleration, and its measurement accuracy is limited

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