Based On Infrared Thermal Image Of Concrete Structural_damage Detection

This paper's research subject originates from the State Natural Sciences Foundation project—carbon fiber intelligence level many coupling mechanism and the field territory diagnosis (the project number: 10672128).This article take concrete structure's damage monitor and the analysis as the background, the use infrared thermal imagery fast, comprehensive, the lossless examination characteristic achieves to the concretes damage carries on the goal which the fast comprehensive visualization monitors and analyzes. When the concretes have the damage, its heat conductivity will change, when will have the heat source will pour into, the concretes component surface will present the non-uniform temperature field, may examine the concretes internal damage situation through the infrared thermal imagery technology. This article draws support from the infrared thermal imaging system, comes the sensation concrete structure the distortion and the damage, has carried on the exploring theoretical analysis as well as the massive experimental study regarding the related question.This article carries on the infrared thermal imagery law survey concretes flaw's theory and the experimental study, are for the purpose of having in the related achievement foundation, unifies through the theoretical analysis and the massive experiments, discusses one kind of feasible concretes flaw non-destructive inspection the method.To this purpose, this paper the following several aspects of the study:1st, has analyzed the concretes damage type and the manifestation, the damage evolution, the damage and the material heat conductivity relations, has studied the damage correspondence component surface temperature field, thus to use the infrared thermal imagery the temperature field description and the attribute damage field has laid the foundation.2nd, has studied the influence infrared thermal imagery chart quality factor, including heat source, heating-up time, environment and so on. Analyzed gained the high grade infrared thermal imagery chart condition, through the massive experiments, the uniformity which the analysis heat source poured into; The heat source, the thermal imaging system and object of study's relative position and so on, obtains absorbs the high grade infrared thermal imagery chart the plan.3rd, proposes the judgment infrared thermal imagery chart quality target: Sensitivity and clarity. The sensitivity is the damage spot and the complete spot temperature difference, on the clarity namely infrared thermal imagery chart the temperature anomaly region keenness. According to the massive experiment proof, whether there is uses these two targets to be able to reflect the concretes damage accurately, the damage position and the damage degree.4th, through uses the infrared thermal imaging system to examine the concretes damage the massive experiments, as well as experimental result summary and analysis. Analyzed the concretes test specimen monotonous compression damage, the slow change damage, to bury the massive material damage and the freezing and thawing damage occurrence and the development in advance. Uses test specimen surface temperature profile information which the infrared thermal imagery examines, gives the use diagram of curves search flaw depth and the size method; The establishment damage and between the test specimen surface temperature distribution and the change relation, realizes to the flaw localization and the qualitative diagnosis, has made some attempts for the infrared thermal imagery examination damage's application.5th, the infrared thermal imagery chart had indicated clearly the concretes monotonous compression is the cleavage destroys, but the concretes slow change compression is the shearing failure; Under the one-sided heating condition, the test specimen presents Leng Ban is as a result of the interior including the high fever conductance mixture, presents the hot spot is because the interior or presents the damage including the low heat conductance's mixture; The infrared thermal imagery examination is helpless to the test specimen surface crack..This article studies involves to mechanics, the electricity, the concretes material study, heat transfer theory and so on multi-disciplinary, its achievement to enhances the conventional concretes infrared non-destructive inspection the efficiency and the precision, promotes the infrared thermal imagery to have certain practical significance in the concrete structure non-destructive inspection application, moreover applies to the carbon fiber concretes in the essential construction structure, and realizes the damage real-time monitor to have the instruction function.