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Bridge rapid test and evaluation method based on temperature change

A bridge and fast technology, applied in the field of structural health monitoring, can solve problems such as lack of data processing methods, and achieve effective safety assessment and maintenance management, effective safety status, and simple operation

Active Publication Date: 2017-11-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the above that the traditional health monitoring system plays an important role in discovering and responding to bridge emergencies, but the existing health monitoring technology cannot really realize the "health" monitoring of the structure, the main reason is the lack of effective data processing methods

Method used

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  • Bridge rapid test and evaluation method based on temperature change

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Embodiment 1

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereto.

[0038] figure 1 It is the basic process of the method of the present invention. The safety state assessment of the bridge firstly through the site survey and the structural drawings to get familiar with the tested bridge, and determine the layout of the acceleration sensor and temperature sensor. Then, through the data acquisition equipment to collect the structure at the reference temperature T 0 , change the temperature T 1 and T 2 The dynamic response of the acceleration structure under the conditions and the corresponding external temperature load value. After completing the vibration test under the three temperature states, the pre-processing and post-processing of the vibration test signal are started. Because bridge structural vibration tests are inevitably affected by factor...

Embodiment 2

[0060] The following uses a typical bridge case to illustrate the implementation steps of the proposed rapid test and evaluation method for bridges based on temperature changes.

[0061] Step 1: First, determine the arrangement of sensors according to the structural characteristics of the bridge. In this implementation case, 12 acceleration sensors and 1 temperature sensor are arranged at equal intervals on the entire bridge structure.

[0062] Step 2, reference temperature T 0 and change the temperature T 1 and T 2 Structural dynamic response data and external temperature load values ​​under these conditions. The typical acceleration responses of fixed beams under different temperature conditions are as follows: figure 1 shown in the flowchart, in this case the reference temperature T 0 =20°C, change the temperature T 1 and T 2 The values ​​are 10°C and 20°C respectively.

[0063] Step three, identify the basic modal parameters of the structure under different tempera...

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Abstract

The invention discloses a bridge rapid test and evaluation method based on temperature change. Structural dynamic response of the bridge structure under different temperature conditions is acquired through sensors arranged on the bridge; and the basic dynamic characteristic parameters of the bridge structure under different temperature conditions are identified by using a dynamic signal analysis method and substituted in the mapping relationship between the vibration mode scaling factor and the external temperature conditions and the dynamic parameters to obtain the vibration mode scaling factor of the bridge structure and the displacement flexibility matrix deep parameters under different temperature conditions so as to predict deformation of the structure under any static load and perform damage identification and long-term structural performance study. The disadvantages that the conventional impact vibration test requires an artificial excitation device and requires to close the traffic can be overcome, and the disadvantages that the present environmental vibration test method cannot effectively support bridge structure safety evaluation can also be overcome so that the method has the advantages of less test time without closing the traffic, high accuracy and high anti-noise capacity.

Description

technical field [0001] The invention relates to a rapid test and evaluation method for bridges based on temperature changes, which can realize deflection prediction and safety state evaluation of bridge structures, and belongs to the technical field of structural health monitoring. Background technique [0002] The concept of structural health monitoring technology was proposed in the 1930s, and it is generally considered to be one of the most effective ways to improve the health and safety of engineering structures and achieve long life and sustainable management of structures. After decades of development, new intelligent sensing technologies such as wireless sensing, optical fiber sensing, and microwave radar technology have sprung up and been rapidly promoted. The hardware foundation required for health detection technologies such as various types of sensors and data acquisition systems Gradually established, various types of structural identification methods, damage ide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00
CPCG01M5/0008G01M5/0033G01M5/0066
Inventor 张建田永丁
Owner SOUTHEAST UNIV
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