Method for reinforcing old concrete gravity dam with cracks through FRP sheets

A technology of FRP sheets and concrete, which is applied in the direction of gravity dams, dams, water conservancy projects, etc., and can solve the problems of rare large-volume concrete structures reinforced by FRP sheets

Inactive Publication Date: 2014-06-04
凌贤长
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies on the reinforcement of large-volume concrete structures with FRP sheets, and there is no report on the design theory and calculation methods of the old concrete gravity dam with cracks in the reinforcement of FRP sheets.

Method used

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  • Method for reinforcing old concrete gravity dam with cracks through FRP sheets
  • Method for reinforcing old concrete gravity dam with cracks through FRP sheets
  • Method for reinforcing old concrete gravity dam with cracks through FRP sheets

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Embodiment Construction

[0035] The present invention also provides the implementation steps of the old concrete gravity dam body with cracks in the FRP sheet reinforcement, as follows.

[0036] (1) Regardless of the slip effect between the FRP sheet and the concrete of the dam body, the maximum shear stress when cracks occur in the old concrete gravity dam working with cracks is obtained through the corresponding method established.

[0037] (2) With the help of the bond-slip (δ-τ) constitutive relationship between the FRP sheet and the concrete interface of the dam body, the bond-slip model is used to obtain the old concrete with cracks when considering the bond-slip deformation of the interface For the maximum shear stress when cracks occur in the gravity dam body, the larger value of the maximum shear stress calculated by the above two methods is taken as the basis for the design and construction of FRP sheets.

[0038](3) Select the typical rectangle of the main cracks on the surface of the old c...

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Abstract

The invention belongs to the technical field of structural engineering and water conservancy and hydroelectricity engineering, and provides a computing method for reinforcing an old concrete gravity dam with cracks through FRP sheets. According to the method, the computing method of maximum shear stress tau needed by generation of the cracks of the old concrete gravity dam is given on the situation that the condition of slippage between the FRP sheets and a concrete interface of a dam body and the condition without slippage between the FRP sheets and the concrete interface of the dam body are taken into consideration, a model for bonding and slippage between the FRP sheets and concrete of the dam body is built, and a mathematical expression for the relation between the maximum shear stress t needed by crack generation and maximum resistance of the reinforced concrete dam body is obtained through calculation. The method for reinforcing the old concrete gravity dam with the cracks through the FRP sheets provides the specific implementation steps for the design of reinforcement of the old concrete gravity dam body with the cracks through the FRP sheets, and can be used for calculation and analysis of the operation that the cracks of the old concrete gravity dam are repaired through the FRP sheets.

Description

technical field [0001] The invention relates to a design method for an old concrete gravity dam body with cracks reinforced by an FRP sheet, which relates to the technical fields of structural engineering and water conservancy and hydropower engineering. Background technique [0002] Due to the temperature load of the old concrete gravity dam body, the periodic change of the water level of the dam body operating environment, the shrinkage of the dam body concrete, the freeze-thaw cycle effect and other factors, it is very easy to cause a large amount of tension or shear in the dam body. The cracks have caused huge hidden dangers to the normal use and safe operation of the dam. Due to the advantages of light weight, high strength and corrosion resistance, FRP sheets are bonded to the surface of old concrete gravity dams with cracks through epoxy resin, which can effectively inhibit the expansion of concrete cracks and achieve repair and reinforcement of old dams. The basic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B7/10E02B3/16
Inventor 唐亮凌贤长田爽于程一咸贵军
Owner 凌贤长
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