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Quick load test method for bridge carrying capacity

A technology of load test and bearing capacity, applied in the field of bridge construction, can solve the problems of large influence of human factors and large traffic interference in the structure inspection method, and achieve the effects of improving the test time, reducing the traffic interference and increasing economic benefits.

Active Publication Date: 2009-09-16
JSTI GRP CO LTD
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Problems solved by technology

[0006] The purpose of the present invention aims at the current bridge structure bearing capacity evaluation method, the structural detection algorithm is greatly affected by human factors, and the load test method has a relatively large traffic interference defect, and proposes a fast and accurate bridge bearing capacity evaluation method

Method used

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  • Quick load test method for bridge carrying capacity
  • Quick load test method for bridge carrying capacity
  • Quick load test method for bridge carrying capacity

Examples

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Embodiment 1

[0024] Such as image 3 As shown, a three-span continuous girder bridge with a span combination of 58.96m+100m+76.96m adopts a three-span prestressed concrete variable cross-section single-box single-chamber continuous box girder. The height of the box girder is 2.97m from mid-span to The 2m of the center of the main pier changes to 5.77m according to the quadratic parabola.

[0025] Such as figure 1 Shown is the entire bridge evaluation process. The rapid load test method for bridge bearing capacity of the present invention is used in the bridge evaluation process and can be performed before the conventional load test steps.

[0026] Such as figure 2 As shown, the rapid load test evaluation method of bridge bearing capacity adopts the following steps:

[0027] (1) Conduct quasi-static load test steps on the bridge site

[0028] The quasi-static load test uses two 20-ton trucks to pass the bridge in parallel and slowly on different lanes, and the combination of different ...

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Abstract

The invention relates to a quick load test method for bridge carrying capacity, and aims to provide a quick and accurate bridge carrying capacity evaluating method. The method comprises the following steps: performing a bridge quasi-static load test; establishing an initial finite element model; correcting the model by a control measuring point strain influence line obtained through actual measurement of the quasi-static load test; respectively distributing loads on the model before and after the correction according to the load test requirement, and calculating to obtain control measuring point flexivity values f before the correction and f after the correction; and defining that eta'=1.1*f after the correction / f before the correction, obtaining a check-calculation coefficient Z2 of a structure according to the efficiency coefficient eta', and performing check calculation on the structure through Z2.

Description

technical field [0001] The invention belongs to the field of bridge construction, and in particular relates to a quick load test method for the bearing capacity of a bridge. Background technique [0002] At present, the evaluation methods of bridge bearing capacity in my country are mainly divided into two types: structural inspection method and conventional load test method: [0003] The structural inspection method is based on the inspection results of the bridge structure or components, and carries out reasonable values ​​of a series of coefficients such as structural inspection coefficients and section reduction coefficients, and then conducts finite element analysis based on design drawings or as-built data to evaluate the bridge's bearing capacity a method of [0004] The load test method is a scientific experimental research carried out directly on the bridge structure, through the real bridge loading test to understand the overall mechanical performance of the bridg...

Claims

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Application Information

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IPC IPC(8): G01M19/00G01M99/00
Inventor 张宇峰马志国段鸿杰徐剑徐文平
Owner JSTI GRP CO LTD
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