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Title |
Laboratory Validation of Bridge Finite Model Updating Approach By Static Load Input/Deflection Output Measurements
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DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.3.010 |
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Keywords |
단경간 교량 ; 유한요소모델개선 ; 동적실험 ; 정적실험 ; 데이터 통합 Short-span bridges ; Finite element model updating ; Dynamic test ; Static test ; Data fusion |
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Abstract |
This paper presents a laboratory validation of a new approach for Finite Element Model Updating(FEMU) on short-span bridges by combining ambient vibration measurements with static load input-deflection output measurements. The conventional FEMU approach based on modal parameters requires the assumption on the system mass matrix for the eigen-value analysis. The proposed approach doesn't require the assumption and even provides a way to update the mass matrix. The proposed approach consists of two steps: 1) updating the stiffness matrix using the static input-deflection output measurements, and 2) updating the mass matrix using a few lower natural frequencies. For a validation of the proposed approach, Young's modulus of the laboratory model was updated by the proposed approach and compared with the value obtained from strain-stress tests in a Universal Testing Machine. Result of the conventional FEMU was also compared with the result of the proposed approach. It was found that proposed approach successfully estimated the Young's modulus and the mass density reasonably while the conventional FEMU showed a large error when used with higher-modes. In addition, the FE modeling error was discussed.
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