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A long-term monitoring method of steel-concrete composite girder deck stress

A panel and stress technology, which is applied in the field of long-term monitoring of steel-concrete composite beam bridge deck stress, can solve the problems of unsuitable steel-concrete composite beam bridges and complicated operation, and achieve the effects of stable and reliable monitoring, simple system composition, and extended service life

Active Publication Date: 2021-07-27
ANHUI TRANSPORTATION HLDG GRP CO LTD
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AI Technical Summary

Problems solved by technology

The existing monitoring methods are relatively complicated to operate and require excavation of beams to measure concrete, so they are not suitable for steel-concrete composite beam bridges

Method used

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  • A long-term monitoring method of steel-concrete composite girder deck stress
  • A long-term monitoring method of steel-concrete composite girder deck stress
  • A long-term monitoring method of steel-concrete composite girder deck stress

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Experimental program
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Effect test

Embodiment

[0028] A long-term monitoring method for steel-concrete composite girder deck stress, such as figure 2 As shown, the specific steps are as follows:

[0029] (a) Preset the degree of relaxation of prestress, and perform finite element simulation, so as to obtain the reference value of support reaction force calculation,

[0030] Calculation reference value R of support reaction force c1 , R c2 ,...,R ci ,...R cn Tension T with prestressed tendon 1 c1 , T c2 ,...,T ci ,...T cn The relationship between satisfies:

[0031]

[0032] (b) Use the support with pressure sensor installed on the top of pier 5 to measure the measured value of the support reaction force on the top of pier 5 in real time. The measured value of the support reaction force on each pier 5 is R s1 , R s2 ,...,R si ,...R sn ;

[0033] (c) The actual relaxation degree of prestressed tendon 1 is calculated by calculating the reference value of support reaction force and the actual measurement value...

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Abstract

The invention relates to a long-term monitoring method for the deck stress of a steel-concrete composite girder bridge. The specific steps are as follows: (a) preset the degree of relaxation of prestress, and perform finite element simulation to obtain a reference value for calculation of support reaction force; (b) measure the bridge pier in real time (5) The measured value of the support reaction force at the top of the pier; (c) The actual relaxation degree of the prestressed tendon (1) is calculated by calculating the reference value of the support reaction force and the measured value of the support reaction force. Compared with the prior art, the present invention has clear force analysis and reliable monitoring system.

Description

technical field [0001] The invention relates to a stress monitoring method, in particular to a long-term monitoring method for steel-concrete composite girder deck stress. Background technique [0002] Accurate detection of the permanent stress of prestressed tendons plays an important role in determining the current stress level and future stress safety reserve of bridge structures. At present, the traditional stress measurement mainly adopts strain sensor. Chinese patent CN 205352597 U discloses a bridge permanent prestress detection device, in which a protective layer concrete excavation area is provided on the side of the bridge body, a surface strain gauge is arranged on the surface of one end of the prestressed steel strand, and the other end of the prestressed steel strand There are stress release points on the surface of the bridge, and the surface strain gauges are connected to the data acquisition instrument through wires. A through-hole pressure sensor is instal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00G06F30/23
CPCG01L5/0047G06F30/23
Inventor 胡可杨晓光陈发根曹光伦李润清石雪飞姚春江段海澎陈维平刘志权梁长海王胜斌阮仁华
Owner ANHUI TRANSPORTATION HLDG GRP CO LTD
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