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Method for predicting influence range of surface crack on internal temperature field of concrete

A technology of surface cracks and influence range, applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as the inability to reflect the influence of crack temperature field

Active Publication Date: 2019-03-22
HOHAI UNIV
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Problems solved by technology

[0004] Since the concrete temperature response test process can only study the influence of cracks on the temperature response of specific points inside the concrete, it cannot reflect the influence of cracks on the internal temperature field of concrete

Method used

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  • Method for predicting influence range of surface crack on internal temperature field of concrete
  • Method for predicting influence range of surface crack on internal temperature field of concrete
  • Method for predicting influence range of surface crack on internal temperature field of concrete

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Embodiment Construction

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples. The examples provide a method for predicting the influence range of different crack depths on the internal temperature field of the concrete model.

[0028] In order to study the influence range of surface cracks on the temperature response of concrete, the numerical simulation analysis of concrete temperature response was carried out using ANSYS finite element software, and the influence range of cracks on the internal temperature field of concrete was obtained, and the relationship between the crack depth and the thickness of the protective layer was established through regression analysis. Prediction model of crack influence range.

[0029] Based on the thermal parameters of the actual concrete specimens, the thermal parameters of the concrete model...

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Abstract

The invention discloses a method for predicting the influence range of surface crack on an internal temperature field of concrete. The method comprises the steps of on basis of a temperature responsetest, using ANSYS finite element software to carry out numerical simulation analysis of concrete temperature response, establishing a finite element model of a concrete sample with surface cracks, studying a one-dimensional temperature response process of the model, and considering the actual concrete structure protective layer thickness and crack situation; extracting the temperatures of nodes atdifferent depths from the upper surface of the concrete for analyzing, and working out the temperature response equilibrium time of the concrete with the surface cracks; using the temperature response equilibrium time at the distal end of the cracks as a reference value to calculate ratios of the temperature response equilibrium time at different coordinate positions to the reference value so asto obtain relative values of the concrete temperature response equilibrium time at the different coordinate positions, defining a coordinate region corresponding to the certain relative values as theinfluence range of the cracks, and carrying out regression fitting analysis to obtain a calculation model of the influence range of the concrete cracks.

Description

technical field [0001] The invention relates to the field of concrete heat transfer, in particular to a method for predicting the influence range of surface cracks on the internal temperature field of concrete. Background technique [0002] The internal temperature field of concrete has an important influence on the durability of concrete structures. Durability problems such as concrete carbonation, chloride ion erosion, and steel bar corrosion in concrete are closely related to the internal temperature field of concrete. [0003] Most of the existing prediction models for concrete carbonation, chloride ion erosion, and steel bar corrosion rate are based on the consideration of natural environment temperature and relative humidity. The direct factors affecting the durability of concrete mentioned above should be the internal temperature and water content of concrete. In actual concrete structures, the action of temperature and load will lead to cracks on the concrete surfac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 蒋建华付用全翁伟新
Owner HOHAI UNIV
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