Method for measuring dynamic deflection of bridge
A deflection measurement and bridge technology, which is used in measurement devices, elasticity testing, and machine/structural component testing. The effect of high deflection accuracy
Inactive Publication Date: 2013-09-11
GUANGZHOU UNIVERSITY
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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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[0029] Such as figure 1 , bridge dynamic deflection measurement method of the present invention comprises the following steps:
[0031] The connecting pipe is laid longitudinally along the beam body of the bridge and fixed on the beam body, and the water tank is fixed at a part not affected by structural vibration; the deflection measuring point is determined according to the bridge structure type, and the pressure transmitter and acceleration sensor are arranged on the same section of the measuring point. The pressure transmitter measures the liquid pressure in the connecting pipe, and the acceleration sensor measures the acceleration of the connecting pipe;
[0032] 2) Data collection
[0033] Select the range of the pressure transmitter, and obtain the initial pressure of each measuring point connected to the pipe wall through the pressure transmitter, and the static pressure of the connected pipe wall at a certain point; obtain the acceleration ...
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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...
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Inventor 刘夏平孙卓杨红
Owner GUANGZHOU UNIVERSITY