Use Impact-Echo Method to Evaluate Bond of Reinforced Concrete Subjected to Early-Age Vibration

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概要

• 論文の詳細を見る

• The purpose of this paper is to develop a non-destructive test method for evaluating the bond of reinforcing bars in concrete structure which was damaged by earthquake while still cast in the form. In the experimental design, the specimens containing a steel reinforcing bar with one end extruded outside were constructed. Different degrees of damage on the rebar-concrete interfaces were successfully created by the resonant vibration of exposed steel bar induced by the cyclic motion of the specimen. The local bond-loss of the steel bars was evaluated by both non-destructive impact-echo tests and the destructive pullout tests. To create different kinds of failure mode in the pullout test, some of the specimens contain stirrups surrounding reinforcing bar. Poor-bond was quantitatively evaluated before the pullout test by the amplitude of the peak corresponding to the multiple reflections from the steel bar in the normalized spectra derived from the impact-echo tests. As a result, two empirical formulas displaying the proportional relations between the percentage of loss of local bond-stress and loss of steel-amplitude for specimens failed by split failure and pull-out failure modes were established.

• 一般社団法人 日本機械学会の論文

著者

• Cheng Chia-chi

  Department Of Construction Engineering Chaoyang University Of Technology

• HSU Keng-Tsang

  Department of Civil Engineering, National Chung Hsing University

• LIN Yiching

  Department of Civil Engineering, National Chung Hsing University

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