Disease concrete bridge bearing capability evaluation method

A technology of bearing capacity and concrete, which is applied in the field of bearing capacity assessment of diseased concrete bridges, and can solve the problems of inaccurate assessment results of assessment grade division and assessment results

Pending Publication Date: 2016-03-23
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the existence of the evaluation process of the bearing capacity of the diseased concrete bridge in the prior art, the random change of various uncertain factors and the ambiguity of the evaluation grade division have a great impact on the evaluation results and make the evaluation results inaccurate Technical problem, the present invention provides a method for evaluating the bearing capacity of diseased concrete bridges based on probability statistics theory and fuzzy comprehensive evaluation theory

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  • Disease concrete bridge bearing capability evaluation method
  • Disease concrete bridge bearing capability evaluation method
  • Disease concrete bridge bearing capability evaluation method

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Embodiment 1

[0086] Embodiment 1: The method for evaluating the bearing capacity of a diseased concrete bridge of the present invention is applied to the checking and evaluation of the bearing capacity of a simply supported hollow slab bridge with a disease in service. The general situation of the bridge with the disease is as follows: the standard span is 12m, the total length of the hollow slab is 11.96m, the cross-sectional schematic diagram of the upper structure and the mid-span section size and reinforcement of the hollow slab, such as Figure 12 with Figure 13 As shown, the design strength of concrete is C25, the main reinforcement adopts grade II reinforcement, and the design bearing capacity M is calculated after review. 0 =502.4kN·m.

[0087] According to the content of the present invention, this bridge is carried out bearing capacity evaluation, and concrete process is as follows:

[0088] (1) The typical disease index U of the concrete bridge to be detected by conventional ...

Embodiment 2

[0131] Embodiment 2: The method for evaluating the bearing capacity of a diseased concrete bridge of the present invention is applied to the checking and evaluation of the bearing capacity of a diseased T-beam bridge in service. The basic situation of the T-beam bridge with disease in service: it is a 3-hole 20m prefabricated reinforced concrete simply supported T-beam, the cross-section of the superstructure and the main beam reinforcement diagram are as follows Figure 14 with Figure 15 As shown, the concrete design strength is C25, and the main reinforcement adopts grade Ⅱ steel reinforcement. After reviewing the original section design bearing capacity M 0 =2196.57kN·m.

[0132] Carry out bearing capacity assessment to this bridge according to content of the present invention, concrete process is as follows:

[0133] (1) Using the conventional bridge disease detection method, statistical analysis is used to obtain the disease index of the T-beam bridge in service u i...

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Abstract

The invention discloses a disease concrete bridge bearing capability evaluation method, which supposes various uncertainties influencing disease concrete bridge bearing capability evaluation to possess random variables of certain probability distribution characteristics, and defines disease index influence degrees to a bridge bearing capability as bearing capability partial checking computation coefficients according to a bearing capability calculation method. Based on an actual disease index detection result and mathematical statistics, the method employs monte carlo random simulation calculation and a fuzzy comprehensive evaluation principle to obtain a probability distribution characteristic approximating the disease concrete bridge bearing capability to be evaluated, an furthermore obtain a bearing capability evaluation result possessing a certain probability guarantee. The method overcomes the uncertainty influences caused by neglecting randomness of various factors and fuzzyness of evaluation grade division in a present highway bridge bearing capability evaluation standard, thereby realizing more scientific and rational evaluation results.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a method for evaluating the bearing capacity of a diseased concrete bridge. Background technique [0002] my country's highway bridges are in a period of high-speed construction. As of the end of 2013, there were 735,300 highway bridges nationwide, of which concrete bridges accounted for about 90% of the total, and more than 20,000 were built every year. However, based on the basic national conditions of our country, the main characteristics of the diseased concrete bridges are: the bridges built in the early stage, the design load level is low, and the construction quality is poor; the bridges in the coastal area, the corrosion of the chloride salt leads to the corrosion of the steel bar, the delamination or peeling of the concrete protective layer and other durable The serious problem of safety; the phenomenon of overload and overrun operation is prominent, so that e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06
CPCG06Q10/0639
Inventor 吕忠达蔡可键徐爱敏鲁春晓赵卓康朝静
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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