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Concrete beam service life prediction method considering cracking damage step stiffness

A concrete beam and life prediction technology, applied in the field of transportation, can solve problems such as complex calculation process, inaccurate prediction, and potential safety hazards

Active Publication Date: 2022-04-26
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technology, the fatigue stiffness degradation law and life prediction of concrete beams, the calculation process is complicated, and the prediction is not accurate at the same time, and there are certain safety hazards

Method used

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  • Concrete beam service life prediction method considering cracking damage step stiffness
  • Concrete beam service life prediction method considering cracking damage step stiffness
  • Concrete beam service life prediction method considering cracking damage step stiffness

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Embodiment Construction

[0050] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0051] Such as figure 1 As shown, the embodiment of the present invention proposes a concrete beam life prediction method considering the step stiffness of cracking damage, including steps S1-S5:

[0052] S1. Obtain the initial stiffness of the undamaged concrete beam;

[0053] S2, setting the first moment, and determining the remaining bending stiffness of the concrete beam at the first moment;

[0054] S3. Based on the preset time interval, determine the remaining flexural stiffness of the concrete beam at several moments;

[0055] S4, using the remaining flexural stiffness at adjacent moments as a data group, and calculating several concrete beam stiffness degr...

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Abstract

The invention discloses a concrete beam service life prediction method considering cracking damage step stiffness. The method comprises the steps that the initial stiffness of a non-damage concrete beam is acquired; setting a first moment, and determining the residual flexural rigidity of the concrete beam at the first moment; based on a preset time interval, determining the residual bending stiffness of the concrete beam at a plurality of moments; taking the residual flexural rigidities at adjacent moments as a data set, and calculating a plurality of concrete beam rigidity degradation rates according to a plurality of data sets; and determining the fatigue life of the concrete beam according to the plurality of rigidity degradation rates and the initial rigidity of the concrete beam. The fatigue life of the concrete beam can be accurately predicted.

Description

technical field [0001] The invention relates to the technical field of transportation, in particular to a method for predicting the life of a concrete beam considering the step stiffness of crack damage. Background technique [0002] As traffic becomes more and more convenient, it is more convenient for people to travel. There are a large number of small and medium-span bridges in my country. Compared with long-span bridges, small and medium-span bridges have lighter weight. Under the repeated action of vehicle loads, bridge structures are more prone to fatigue damage, which leads to weakening of structural functions and lower bearing capacity. It even affects the safety of the structure. Therefore, people are paying more and more attention to the law of fatigue stiffness degradation and life of concrete beams. In order to eliminate potential safety hazards and carry out corresponding maintenance work in time, it is necessary to accurately predict the life. In the prior art,...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/04G06F119/14
CPCG06F30/20G06F2119/14G06F2119/04Y02T90/00
Inventor 左新黛姬伟
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT