Post-installed adhesive anchor bolts are commonly used on all types projects, from standard buildings to bridges and nuclear power plants. They are exposed to varying and diverse environmental conditions which are significant successfully to make connections to concrete structures for many years. In order to maintain the safety and reliability of concrete structures such as buildings or bridges on higher level over a long period time, we developed a new non-destructive inspection system of adhesive an...
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Development of non-destructive inspection technique for adhesive anchor bolts using AE sensor (1) An experimental approach

We have developed a non-destructive inspection technique using the AE (acoustic em sion) sensor. It is intended to be non-destructive evaluation in soundness of the adhesion anchor is installed in a nuclear power plant. We analyzed the Eigen frequ cy of the adhesive anchor measured by the AE sensor using a finite element method . Results of the analysis of the Eigen frequency, the change in Eigen frequency cou ld be confirmed between the adhesive anchor which simulates the Peeling of the resi n by aging de...
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Development of non-destructive inspection technique for adhesive anchor bolts using AE sensor (2) Theoretical examination

A new non-destructive inspection technique with using acoustic emission (AE) sensor was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with no dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The investigation of applying the new method to mechanical anchor bolts is reported. From experimental results by using this technique, ...
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Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor

１．緒言 原子力発電所では、多数の基礎ボルトや配管が用いられている。これらの基礎ボルトや配管などの鋼棒、鋼管は、周辺環境（設置場所や内部流体、機械振動など）により経年劣化（腐食、摩耗、き裂など）が発生する可能性が潜在している1-2。従って、機器・構造物の安全性・信頼性を確保する観点より、鋼棒、鋼管の経年劣化を検出する非破壊検査技術が望まれている。 このような鋼棒、鋼管の健全性を検査する手法として、一般的には、目視検査や打音検査、超音波検査が採用されている3-7。しかしながら、目視検査では、たとえば基礎ボル......
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Development of a new inspection system for steel rod and pipe using AE sensor (1) Experimental approach

A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. The Eigen frequency and modal frequency response analysis were conducted based on FEM (finite element method). Several peaks due to natural vibrations were observed in the frequency distribution calculated in this study, and comparisons with experi...
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Development of a new inspection system for steel rod and pipe using AE sensor (2) Theoretical approach

A new non-destructive inspection technique with using acoustic emission (AE) sensor for mechanical anchor bolt was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with little dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The detectability to crack width on concrete was reported. From experimental results by using this techni...
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Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor 2

A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. Inner surface corrosion model of the piping changing the corrosion contents were simulated frequency distribution by dynamic analysis using the finite element method, and comparisons with experimental results obtained from mockups with simulated degr...
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Development of a new inspection system for steel rod and pipe using AE sensor 2 (2) Theoretical approach

For evaluating the soundness of steel rods and pipes, which are installed in nuclear power plants, we have developed a new inspection system using an AE (acoustic emission) sensor. This report described the results of studies for the detection of defects in the steel pipe and steel rod using a new inspection system. ...
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Development of a new inspection system for steel rod and pipe using AE sensor 2 (1) Experimental approach

Abstract We developed a hammering sound inspecting system using AE sensor with objectivity and recordability and confirmed that it is possible to grasp the state of concrete (internal cavity and surface peeling) from the vibration analysis result obtained , And confirmed the usefulness of concrete health diagnosis using this system. ...
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Development of nondestructive inspection system for soundness diagnosis of concrete structure

Special attentions have been increasingly paid for the diagnosis of social infrastructures after the collapse of ceiling of Sasago tunnel of Chuo Expressway. It is reported that the main cause was due to the age-related degradation of chemical anchors. Chemical anchors are also frequently used in nuclear power stations. Here we have been trying to apply PFM (Probabilistic Fracture Mechanics) to the diagnosis of social infrastructures using Dr. Mainte, an integrated simulator to optimize maintenance activi...
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A Study of Application of PFM (Probabilistic Fracture Mechanics) to the Diagnosis of Social Infrastructures ]