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Method for monitoring stress of bridge deck of steel-concrete composite beam for long time

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

Active Publication Date: 2019-08-02
ANHUI TRANSPORTATION HLDG GRP CO LTD
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  • Description
  • Claims
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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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  • Method for monitoring stress of bridge deck of steel-concrete composite beam for long time
  • Method for monitoring stress of bridge deck of steel-concrete composite beam for long time
  • Method for monitoring stress of bridge deck of steel-concrete composite beam for long time

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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 relaxation degree of the prestress, and perform finite element simulation to obtain the reference value for the calculation of the support reaction force,

[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...

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Abstract

The invention relates to a method for monitoring stress of bridge deck of steel-concrete composite beam for long time, which comprises the following steps: (a) presetting the prestress relaxation degree, and performing finite element simulation to obtain a support reaction force calculation reference value; (b) measuring a real-time measured value of a supporting reaction force at the pier top ofthe pier (5); and (c) calculating the actual relaxation degree of the prestressed tendon (1) through the support reaction force calculation reference value and the real-time measured value of the supporting reaction force. Compared with the prior art, the method for monitoring stress of bridge deck of steel-concrete composite beam for long time is clear, and the monitoring system is reliable.

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 Applications(China)
IPC IPC(8): G01L5/00G06F17/50
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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