Method for evaluating damage degree of hinge joints of plate girder bridges

A technology of damage degree and hinge joint, which is applied in the field of bridge structure evaluation in civil engineering, can solve the problems of lack of quantitative indicators and easy misjudgment

Active Publication Date: 2012-07-25
SHANGHAI TONGHAO CIVIL ENG CONSULTING +1
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Problems solved by technology

For the degree of damage, there is still a lack of quantitative indic

Method used

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  • Method for evaluating damage degree of hinge joints of plate girder bridges
  • Method for evaluating damage degree of hinge joints of plate girder bridges
  • Method for evaluating damage degree of hinge joints of plate girder bridges

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[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this embodiment is not intended to limit the present invention. Any similar structure, method and similar changes using the present invention should be included in the protection scope of the present invention.

[0059] The bridge selected in the example is a single-span simply supported plate girder structure, with a calculated span of 11.0m, and the cross section is hinged by 12 middle plates and 1 side plate (the bridge is a widened bridge, and the left side is connected to a T beam) . The width of the middle plate is 0.99m, the width of the side plate is 1.3m, the height of the plate is 0.55m, the center distance between adjacent plates is 1.00m, and the 4#~5# plate beam has a 1500mm×400mm machine non-isolation belt. The load rating standard is -20 for cars and -100 for trailers.

[0060] Table 1 Description of each test condition

[0061]

[0062] In or...

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Abstract

The invention relates to a method for evaluating damage degree of hinge joints of plate girder bridges. Shear force and rigidity of a hinge joint are obtained according to information such as load size, position, actually-measured plate girder defection and the like in a bridge static loading test by means of the relation among the hinge joint relative displacement, the hinge joint shear force and the high joint rigidity. A hinge joint force transmission capacity index lambda I and a hinge joint rigidity ratio index lambda i are defined, and corresponding method for evaluating damage degree of the hinge joint is provided. When the lambda I>=0.95 or the lambda i>=20, the hinge joint is determined to be perfect; when the lambda I<=0.9 or the lambda i<=10, the hinge joint is damaged and supposed to be reworked; and when 0.9<lambda I<0.95 or 10<lambda i<20, the hinge joint is damaged and supposed to be maintained instead of being reworked. The method automatically gives consideration to the interaction among the hinge joint shear force, multiple loads and eccentricity of the loads, is applicable to automobile loading, and can provide optimal estimation values of rigidity parameters of multiple tests. Further, using the method can quantitatively judge the damage degree of the hinge joint and avoid influences of subjective factors.

Description

technical field [0001] The invention relates to a method for evaluating the damage degree of hinge joints of slab girder bridges, which belongs to the technical field of bridge structure evaluation in civil engineering. Background technique [0002] The slabs of the prefabricated slab girder bridge are prefabricated, and the slabs are connected by hinge joints. Hinge joints can transfer the load acting on one slab to other slabs, so that all slabs can participate in the force and share the load of the bridge deck. Hinge joint damage is the most common disease of prefabricated slab girder bridges. If the hinge joints are damaged and cannot transmit force laterally, the overall stress pattern of the structure will be destroyed, and the single-slab stress will easily be formed. Most of the collapse accidents of slab girder bridges are caused by the failure of hinge joints. Therefore, timely detection of hinge joint damage and correct evaluation of hinge joint damage are of gr...

Claims

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Application Information

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IPC IPC(8): G01N19/08
Inventor 周正茂袁桂芳田清勇
Owner SHANGHAI TONGHAO CIVIL ENG CONSULTING
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