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

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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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

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