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Quantitative approach for damage detection of reinforced concrete frames

Yoshio Kaneko¹ , Akira Mita² and Hirozo Mihashi¹

1. Dept. of Architecture & Building Science, Tohoku University, Sendai 980-8579, Japan
2. Dept. of System Design Engineering, Keio University, Yokohama 223-8522, Japan
   
   
   

Abstract: The objective of this paper is to provide an analytical basis for the quantitative evaluation of a reinforced concrete structure based on vibration data obtained by using the damage detection technique. A partial reinforced concrete system of a weak beam/strong column moment frame is chosen as an example. A pushover analysis is carried out in order to numerically examine both the story shear-relative displacement characteristics and the associated damage level. In the analysis, a two dimensional nonlinear finite element analysis is employed considering several constitutive models. As a result, the degradation of the stiffness at the damaged story is characterized in association with the story relative displacement. It is also pointed out that the rotation angle of the column-base is highly correlated with the story relative displacement. Based on the analytical findings, quantitative approaches for a structural health monitoring system are suggested considering both the current sensor technologies and those available in the future.

Keywords: Nonlinear FEM analysis; structural health monitoring; reinforced concrete structure; story stiffness; rotation angle of column-base