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Method for durability quantitative design of concrete structure under marine environment

A concrete structure and concrete technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as difficult quantitative calculations

Active Publication Date: 2013-04-24
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the existing defect that the durability design parameters of concrete structures in the marine environment are mainly estimated through qualitative analysis or engineering experience, and it is difficult to calculate quantitatively.

Method used

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  • Method for durability quantitative design of concrete structure under marine environment
  • Method for durability quantitative design of concrete structure under marine environment
  • Method for durability quantitative design of concrete structure under marine environment

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0029] Determine the durability design parameters of a certain reinforced concrete continuous rigid frame bridge under the marine chloride salt environment by the inventive method, realize the durability quantitative design of this reinforced concrete continuous rigid frame bridge, the present embodiment comprises the following steps:

[0030] 1. Determine the thickness of the protective layer of the concrete structure and the attenuation coefficient of the concrete age;

[0031] 1.1 Determining the thickness d of the concrete cover of the reinforced concrete continuous rigid frame bridge

[0032] see figure 1 , Structural design diagram of reinforced concrete continuous rigid frame bridge under marine chloride salt environment. The mark "1" in the reinforced concrete continuous rigid frame bridge represents the bridge span structure, the mark "2" represents the bridge pier, and the mark "3" represents the foundation part.

[0033] According to Article 6.2.1 and Article 6.3....

specific example

[0065] The present embodiment is to verify the concrete example of the validity and superiority of the method of the present invention, comprises the following steps:

[0066] 1. Verification of validity

[0067] In order to verify the effectiveness of the inventive method, utilize general commercial finite element analysis software ANSYS to set up the chloride ion diffusion analysis model of each part of reinforced concrete continuous rigid frame bridge described in embodiment 1, select each group of durability design parameters in table 2 for use , according to the enrichment process of chloride ion concentration on the steel surface, the service life of each component of the reinforced concrete continuous rigid frame bridge can be determined. The thickness of the concrete protective layer is d=70mm, the age attenuation coefficient is n=0.4, and the chloride ion diffusion coefficient is 116.27mm 2 / a as an example, the distribution of chloride ion concentration around the r...

Embodiment 3

[0073] Determine the durability design parameters of a reinforced concrete frame structure under the marine chloride salt environment by the method of the present invention, so as to realize the quantitative design of durability of the reinforced concrete frame structure, the present embodiment includes the following steps:

[0074] 1. Determine the thickness of the protective layer of the concrete structure and the attenuation coefficient of the concrete age;

[0075] 1.1 Determining the thickness d of the concrete cover of the reinforced concrete frame structure

[0076] see Figure 7 , Structural design drawing of reinforced concrete frame structure under marine chloride-salt environment. The mark "1" in the reinforced concrete frame structure represents the frame column, and the mark "2" represents the frame beam.

[0077] According to Article 6.2.1 and Article 6.3.2 of GB / T50476-2008 "Code for Durability Design of Concrete Structures", it can be determined that the envi...

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Abstract

A method for durability quantitative design of a concrete structure under marine environment includes step1 determining protection layer thickness and concrete age attenuation coefficient of the concrete structure; step2 building a relation between chloride ion diffusion coefficient upper limit value, design service life, the concrete protection layer thickness and the concrete age attenuation coefficient based on a chloride ion density distribution calculation model in a concrete structure control area and calculating the chloride ion diffusion coefficient upper limit value of the concrete structure under the marine environment; and step 3 acquiring durability design parameter of the concrete structure meeting preset service life requirement according to the concrete protection layer thickness, the concrete age attenuation coefficient and chloride ion diffusion coefficient upper limit value to achieve durability quantitative design of the concrete structure under the marine environment. The method provides quantitative analysis way and accordance for durability design of the concrete structure under the marine environment.

Description

technical field [0001] The invention relates to a method for durability design of concrete structures, in particular to a method for quantitative design of durability of concrete structures under marine environment. Background technique [0002] In the marine environment, steel corrosion and concrete cracking caused by chloride ions are important reasons for the deterioration of the durability of reinforced concrete structures. At present, the durability design of concrete structures in chloride-salt environment is mainly based on qualitative analysis to determine the strength grade of concrete, water-binder ratio, thickness of concrete protective layer and upper limit of chloride ion diffusion coefficient. Due to the lack of a quantitative relationship model between the design service life of concrete structures and the durability design parameters of concrete structures in the current design codes, it is impossible to quantitatively determine the material properties and ge...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 杨绿峰余波陈正洪斌周明胡春燕
Owner GUANGXI UNIV
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