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Method for evaluating eccentric straight-line prestressed concrete beam bridge bearing ability based on dynamic measurement process

A technology of prestressing and bearing capacity, applied in the field of structural vibration testing, can solve the problem of not being able to evaluate the overall condition of the bridge structure

Inactive Publication Date: 2009-11-25
SHANGHAI TONGJI CONSTR QUALITY INSPECTION STATION
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Problems solved by technology

These methods all face the same problem as the naked eye inspection method: that is, it is impossible to evaluate the overall condition of the bridge structure
This assumption does not match the reality of most prestressed concrete beams

Method used

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  • Method for evaluating eccentric straight-line prestressed concrete beam bridge bearing ability based on dynamic measurement process
  • Method for evaluating eccentric straight-line prestressed concrete beam bridge bearing ability based on dynamic measurement process
  • Method for evaluating eccentric straight-line prestressed concrete beam bridge bearing ability based on dynamic measurement process

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Experimental program
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Embodiment Construction

[0052] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0053] like figure 2 As shown, the main span of the bridge is 25m. The cross-sectional area of ​​the main beam is 0.91m 2 , the moment of inertia is 0.1747m 4 . There are four prestressed tendons at the bottom of the beam. The eccentric distance is 0.45m. The initial prestress tension value is 3.23×10 6 N. The specific implementation steps are:

[0054] 1) Carry out the forced vibration test of the bridge structure and obtain the single-point vibration response of the structure: In this example, FEM finite element simulation is used to simulate the forced vibration test of the bridge structure under simple harmonic excitation, and the measurement structure is on the left side of the beam end. The vibration is excited at 10m from the support, and the vibration is picked up at 7.5m from the right support (such as figure 2 ) structural re...

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Abstract

The invention provides a method for evaluating eccentric straight-line prestressed concrete beam bridge bearing ability based on dynamic measurement process, which includes the steps of: executing forced vibration test for beam bridge structure and acquiring single point vibration movement respond of the structure; establishing structure finite element numeric analysis model for analyzing effect of prestress level to dynamic characteristics of structure; recognizing effective prestress of structure from measured structural power respond variation amount using a method based on sensitivity; calculating anti-crack bearing capacity during test for prestressed concrete beam bridge according to measured effective prestress value. Compared with conventional nondestructive detection method, the method provided by the invention has the advantages of simple and shortcut test process, strict and integral evaluating theory, high precision of test result or the like, and can be conveniently applied to test and evaluation for prestressed concrete beam bridge.

Description

technical field [0001] The invention belongs to the field of structural vibration testing, and relates to the vibration testing and evaluation of prestressed concrete girder bridges. Aiming at the important issue of bearing capacity evaluation of eccentric linear prestressed reinforced concrete girder bridges, a method for identifying through vibration testing and effective prestressing is proposed. to evaluate the bearing capacity of girder bridges. Background technique [0002] Prestressed concrete girder bridges are the most widely used bridge types on highways. It is very important to study the rapid evaluation method for this kind of bridge, especially the evaluation method of bearing capacity. At present, the most widely used bridge assessment method in practice is still based on visual observation. Such a method is indeed effective when the bridge has major local defects. But it is difficult to assess the overall condition of the full bridge. Other methods include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00E02D33/00
Inventor 孙智李镇
Owner SHANGHAI TONGJI CONSTR QUALITY INSPECTION STATION
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