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Laboratory Validation of Bridge Finite Model Updating Approach By Static Load Input/Deflection Output Measurements
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 Title & Authors
Laboratory Validation of Bridge Finite Model Updating Approach By Static Load Input/Deflection Output Measurements
Kim, Sehoon; Koo, Ki Young; Lee, Jong-Jae;
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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.
Short-span bridges;Finite element model updating;Dynamic test;Static test;Data fusion;
 Cited by
철도교량의 주행안전성 평가기준 설정에 관한 연구,전준창;강종길;신병길;박순응;이희현;이영일;

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