ISO 16837:2019 非破壊検査—アコースティックエミッション試験—鉄筋コンクリート梁の損傷認定の試験方法 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee SC 9, Acoustic emission testing.

Introduction

Acoustic emission (AE) techniques are extensively developed in concrete engineering. Concrete structures have long been referred to as maintenance-free. Recently, however, it is realized that the concrete structures can deteriorate due to many factors. In particular, heavy traffic loads result in fatigue of the concrete structures.

In order to assess the fatigue of reinforced concrete beams, one criterion to qualify the damage levels is proposed on the basis of two ratios associated with the Kaiser effect.

New AE parameters of load ratio and calm ratio are defined for qualification of the damage. It is found that the damage qualified by the two ratios are in good agreement with actual damage of the beams. This suggests that the damage of the reinforced concrete structures in service as bridges, docks and buildings be quantitatively assessed, by simply applying cyclic loading and monitoring AE activity.

1 Scope

This document specifies a test for damage qualification of reinforced concrete beams in services as bridges, docks and buildings.

2 Normative reference

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12716 and the following apply.

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Bibliography