Method for monitoring dynamic deflection of bridge based on optimized arrangement of inclinometer

An inclinometer and dynamic deflection technology, which is applied in the field of bridge dynamic deflection monitoring based on the optimal arrangement of inclinometers, can solve problems such as potential safety hazards, redundant sensor layout, and inability to apply the inclination-dynamic deflection monitoring method well, and achieves Improve the effectiveness of automation

Active Publication Date: 2019-10-11
CHINA RAILWAY DESIGN GRP CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing inclination-dynamic deflection monitoring method cannot be well applied to the dynamic deflection monitoring of large complex structure bridges, there are huge safety hazards in predicting bridge dynamic deflection and judging whether the bridge is safe or not, and the ...

Method used

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  • Method for monitoring dynamic deflection of bridge based on optimized arrangement of inclinometer
  • Method for monitoring dynamic deflection of bridge based on optimized arrangement of inclinometer
  • Method for monitoring dynamic deflection of bridge based on optimized arrangement of inclinometer

Examples

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Embodiment 1

[0065] A bridge dynamic deflection monitoring method based on the optimal arrangement of inclinometers, the steps are as follows:

[0066] Step 1, establish the inclination angle of the bridge node where the inclinometer is located to predict the structural dynamics equation of the key section displacement of the bridge;

[0067] The steps to establish the structural dynamic equation are as follows:

[0068] Step 11. For the beam structure, the equation of motion is established according to the mode superposition method in structural dynamics:

[0069] v N = Φ N q m (1)

[0070] where v N ∈ R N×1 represents the vertical displacement matrix, Φ N ∈ R N×m Represents the vertical displacement mode shape matrix, q m ∈ R m×1 Represents the generalized coordinate vector matrix of the vertical displacement matrix, N represents the number of inclinometers deployed, m represents the order of the formation vector used, in the vertical plane, Φ N is the function matrix about t...

Embodiment 2

[0108] A three-span continuous rigid frame bridge in the laboratory has a length of 8 meters and a width of 0.35 meters. The finite element model of the three-span continuous rigid frame bridge was established with Midas Civil 2017. The finite element model of the three-span continuous rigid frame bridge consists of 200 beam elements and 201 nodes. There are 127 nodes on the bridge surface as the installation of the inclinometer. Candidate locations, a total of 9 key sections are used as monitoring sections for bridge dynamic deflection. The schematic diagram of the model and its key sections is shown in figure 1 shown.

[0109] Step 1, establish the inclination angle of the bridge node where the inclinometer is located to predict the structural dynamics equation of the key section displacement of the bridge;

[0110] In this example, the inclination angles of nodes where M (M=3,4,...,15) inclinometer sensors are established in the laboratory to predict the structural dynami...

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Abstract

The invention provides a method for monitoring dynamic deflection of a bridge based on optimized arrangement of an inclinometer, and the method comprises the following steps of establishing an inclination-dynamic deflection transformation equation, simulating a vehicle-passing-bridge condition in a bridge finite element model, extracting the inclination time-history data of inclinometer laying candidate nodes and the displacement time-history data of the bridge key cross-sections as a data set for genetic algorithm optimization training, using the information entropy as a fitness function in the optimization process to obtain the optimal laying positions of the inclinometer with a fixed number and the corresponding information entropy, determining a critical information entropy by taking the relative error equal to 5% of the time-history displacement of the bridge key cross-sections in the predicted finite element model, finding the minimum less than or equal to the number of sensors of the critical information entropy from the information entropies corresponding to the number of the respective sensor in the optimal arrangement of the inclinometer as the number of the optimal sensors, and determining the optimal laying position corresponding to the number of optimal sensors as the laying position of the inclinometer. The method can accurately predict the dynamic deflection of the bridge.

Description

technical field [0001] The invention relates to the field of health monitoring of bridge engineering, in particular to a bridge dynamic deflection monitoring method based on the optimal arrangement of inclinometers. Background technique [0002] Bridges have an extremely important strategic position in modern transportation. In recent years, more and more highways and railway bridges have been built and put into service, which has greatly improved the efficiency of my country's transportation and promoted rapid economic growth. [0003] Bridge dynamic deflection monitoring is an important part of the bridge health monitoring system, and it is an important indicator for evaluating bridge bearing capacity and vehicle driving safety. However, there has been no general monitoring method. Fixing the pendant under the bridge limits the testing of bridges with water under the bridge or bridges whose deck is far away from the ground below the bridge; laser measurement of bridge dyn...

Claims

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Application Information

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IPC IPC(8): G01M5/00G06F17/50
CPCG01M5/0008G01M5/005G06F30/13G06F30/23G06F2119/06
Inventor 苏伟李顺龙王鑫禚一刘洪占王旭顾津申邸昊魏剑锋王菲孟繁增杨学林李忠龙李惠
Owner CHINA RAILWAY DESIGN GRP CO LTD
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