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허광희,이규,윤현도 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2
This paper presents a new algorithm which is applicable in designing a smart damping system for vibration mitigation. The algorithm, which is extended into a unified system from Lyapunov stability theory, enables us to decrease the Quantization errors by its increased stability. The validity of this design method was proved in the numerical simulation on a control model of three-storied building structure. Smart damper was used for MR(magnetorheological fluid) damper in the numerical model, and its control effectiveness was evaluated. In order to make a more accurate control model numerical1y, we updated the model on the basis of the analysis of dynamic characteristics of structure and of the numerical analysis of a lumped mass model, and then adopted a state space model redefined by structural property matrix. Using this improved control model, control effect on structures which were under the influence of each different earthquake magnitude was analyzed with various performance index, and thus the algorithm presented here is proved to be valid.
Control Performance Evaluation to Avoid Pounding of Bridges
Heo, Gwang Hee,Kim, Chung Gil,Jeon, Seung Gon,Kim, Eun Ji Trans Tech Publications, Ltd. 2013 Key Engineering Materials Vol.569 No.-
<P>Earthquake inflicts damage on bridges in various ways. In this research an experimental study was carried out to decrease the damage caused by the pounding of bridges as earthquake load was added. For the experiment, we designed a model of successive bridge composed of a reinforced concrete bridge top and I section steel. At each bridge pier was placed a rubber bearing which was frequently used for seismic isolation. As for damper, we ourselves designed and produced a MR damper of 30 KN. Five experimental conditions were given ranging from without damper, with damper but no electricity input, with damper and electricity input, each with two different algorithms. For the experiment, we inflicted a 50% reduced wave of Kobe earthquake horizontally on the model, and compared the displacements and power data under each condition. The result proved that the MR damper of our own design was effective to prevent the successive bridge model from colliding by exerting a sizable amount of influence on its displacement and power data.</P>
Heo, Gwang Hee,Jeon, Joon Ryong,Lee, Chin Ok,Lee, Gui,Lee, Woo Sang Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.321 No.-
<P>This paper presents an effective method of FE model updating for health monitoring of structures by applying ambient vibration. And this method is experimented through damage detection and proved to be valid. Experiment about ambient vibration is performed on cantilever beam, and the dynamic characteristics are analyzed by NExT and ERA. The results of such experiments are compared to those of FE analysis, and this comparison enables us to overcome some errors in experiments and analysis. On the basis of improved results by the comparison, model updating is performed in order to construct a basic structure for health monitoring. For model updating, we employ direct matrix updating method (DMUM) and Error matrix method (EMM) in which ambient vibration is easily applied. The model updating by the methods are again evaluated in terms of error ratio of natural frequency, comparing each result before and after updating. Finally, we perform experiments on damage detection to verify the method of updating presented here, and evaluate its performance by eigen-parameter change method. The evaluation proves that the method of FE model updating using ambient vibration is effective for health monitoring of structure, and some further application of this method is suggested.</P>
강성 미분법을 이용한 losipescu Beam의 강도계수 분석
허광희 ( Heo Gwang-hee ),윤일로 ( Yoon Il-ro ) 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 논문집 Vol.1 No.2
Iosipescu Beam은 혼합 모드의 파괴 거동에 관하여 자주 이용되고 있는 보 중에 하나이다. 이 연구의 주요 목적은 Iosipescu 보의 모드 II 파괴계수(SIF)를 수치적 실험을 통하여 결정하는데 있다. 이 특별한 연구의 목적에 맞게 강도계수를 구하기 위하여 강성도법이 유도되고, 다양한 종류의 Iosipescu 보의 분석이 이루어진다. 수치적 실험을 위해 요구되어지는 정해를 얻기 위한 기술이 논의된다. 또한 이 수치 실험을 위하여 필요로 되어지는 Mesh의 기준과 요구되어지는 정해도를 위한 수렴 테스트를 실시한다. 약 500 개의 데이터 세트가 분석되어 결과가 이용하기 쉬운 약산식으로 유도되었다.
스마트 무선계측 시스템을 이용한 강박스 거더 교량의 동특성분석
허광희 ( Heo Gwang-hee ),손동진 ( Sohn Dong-jin ),전준용 ( Jeon Joon-ryong ),전승곤 ( Jeon Soeung-gon ),이진옥 ( Lee Chin-ok ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this paper, the dynamic characteristics of a steel box girder bridge are analyzed using a smart wireless measurement system. For the analysis, first, the FE modelling is done to obtain FFT value. Later, data are acquired from the wireless and also from the wired measurement system applied to the same spot of the steel box girder. Then, the real bridge structure is modelled on the basis of the data obtained by the wireless measurement system. The analyzed data value from the modelling is compared to those obtained by the wired measurement system. On the basis of the comparison, the analysis of the dynamic characteristics of steel box girder bridge is performed. The comparative analysis on the modelling values of two different measurement systems shows that the data from the one is in accord with those of the other.