Long-term monitoring method based on beam-type bridge cross section neutral axis safety index

A neutral axis and cross-section technology, applied in the long-term monitoring field based on the safety index of the neutral axis of the cross-section of beam bridges, can solve the problems of damage recognition rate, low spatial resolution, and inability to accurately reflect the structural state, etc., to improve Effect of Accuracy, Low Cost, Excellent Indicative Performance

Active Publication Date: 2019-03-22
TONGJI UNIV
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Problems solved by technology

For example, the traditional strain gauge monitors the strain of structural points, the spatial resolution is too low, resulting in insufficient damage recognition rate, and at the same time ...

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  • Long-term monitoring method based on beam-type bridge cross section neutral axis safety index
  • Long-term monitoring method based on beam-type bridge cross section neutral axis safety index
  • Long-term monitoring method based on beam-type bridge cross section neutral axis safety index

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Embodiment Construction

[0054] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are provided, but the protection scope of the present invention is not limited to the following embodiments.

[0055] A long-term monitoring method based on the safety index of the neutral axis of the girder bridge cross section, such as figure 1 shown, including:

[0056] Step S1: Design and install a dynamic strain gauge assisted by a long gauge support at the top and bottom of the bridge monitoring section, and receive the collected structural strain of the bridge;

[0057] The design process of the dynamic strain gauge specifically includes:

[0058] Step S11: Select at least the mid-span and two quarter points of the bridge as the monitoring section, and other positions can be increa...

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Abstract

The invention relates to a long-term monitoring method based on a beam-type bridge cross section neutral axis safety index. The method comprises the following steps: step S1: designing and installinga dynamic strainmeter assisted by a long scale distance bracket at the top and bottom of a bridge monitoring cross section, receiving and collecting obtained structure strain of the bridge; step S2: searching and preprocessing collected dynamic strain signals once so as to eliminate noise and interference in data; step S3: based on a setting threshold section, extracting an amplitude value causedby same living load and forming a binary array by wave crest values and wave trough values exceeding the threshold section, to obtain a strain response amplitude value; step S4: fitting strain distribution based on plane cross section assumption, and calculating to obtain a neutral axis index; and step S5: performing data integration on the neutral axis indexes within a period of time, analyzing distribution characteristics thereof by using a statistic model, and judging structure safety. Compared with the prior art, the method has the advantages of strong pertinence, stable long-term performance, easy popularization and the like.

Description

technical field [0001] The invention relates to the field of structural safety monitoring, in particular to a long-term monitoring method based on the safety index of the neutral axis of the beam bridge cross section. Background technique [0002] Beam bridges occupy an unshakable main position in highway bridges. With the increase of bridge service life, a large number of newly built bridges are gradually entering the "aging" stage, and various forms of structural degradation inevitably occur. It can be seen that it is urgent to carry out research on safety monitoring of girder bridges under operating conditions. By selecting reasonable and common safety indicators for long-term monitoring, the structural degradation process of the target bridge can be effectively grasped, so as to judge the safety reserve of the target bridge and carry out preventive maintenance. [0003] Bridge strain monitoring has been plagued by many problems in engineering practice. For example, th...

Claims

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Application Information

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IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 夏烨王鹏孙利民
Owner TONGJI UNIV
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