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RISS 인기검색어
- 검색키워드
- 지도교수 : 姜永宗 (검색결과 2 건)
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구조물 변형형상 추정을 위한 변위계측 최적위치 선정기법 연구
This thesis proposes a new algorithm for selecting optimal displacement measurement location to estimate structure deformed shape. A reasonable guideline is presented to select optimal displacement measuring locations and the number of sensors by using this algorithm. Algorithm is divided into two parts. First, to select location of displacement measurement, EI-SF (Effective Independence- Shape Function)Method is proposed by structural shape functions. Second, to select optimal displacement measurement location, ODL (Optimal Displacement Location)Method which is consisting of positioning and structure shape estimation is proposed by grafting EI-SF Method and structural deformed shape estimation SFSM-LS (Structural Shape Function Superposition Method-Least Squares)Method (Choi, Jun Ho, 2011) In order to verify the proposed algorithm, a numerical problem on a two-span beam was carried out. Based on the FE Model, influences of the number of measuring locations and structural shape functions are investigated on the accuracy of the estimation for selecting optimal location. Through the study of numerical example, it could be observed that the proposed algorithm is effective method.
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Ultimate strength of horizontally curved I-girders subjected to equal end moments
이기세 Graduate School, Korea University 2015 국내박사
The curved girder system is expected to be subjected to not only bending moment but also additional torsional moment simultaneously due to its initial curvature, although the primary load is usually supposed to be gravitational load. The torsional moment makes the curved girder behave in a complex manner than the straight beam. When a straight I-girder is subjected to bending moments, sometimes the section shows lateral and rotational displacement without any torsional moment as external loads, so-called lateral torsional buckling. On the other hand, the lateral and rotational displacement is inevitable behavior for curved member because there are always torsional moment acting on. Therefore, in the case of horizontally curved girder, the lateral torsional behavior cannot be regarded as a kind of buckling any more. Moreover, the ultimate strength is reduced because of torsional moment which is caused by curvature effect. In spite of these matters, there has been very few of studies for ultimate strength of curved girder. Even AAHSTO LRFD Bridge Design Specifications 2014, which is regarded as the most progressive specifications, does not suggest any provisions for horizontally curved girders. In this study, a number of numerical analyses to verify main reasons that affect ultimate strength of curved girder, and finally a strength equation is suggested. With this equation, the strength of horizontally curved girder can be calculated with considering all the geometrical properties.
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