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하성진(Ha, Seong Jin) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.8
Dynamic analyses such as response spectrum analysis or time history analysis of structures have been performed to assess the structural demands for earthquake loads. For time history analysis, it is very important to select appropriate input ground motions with construction of numerical models of structures that reflects the non-linearity of the structure. In particular, three-dimensional dynamic analyses are required for skyscrapers or irregular buildings, according to seismic design codes. Current seismic design codes require that two-dimensional time history analysis of a structure should be analyzed using three or more horizontal component ground motions. For three-dimensional analysis, at least three seismic records each consisting of two horizontal components are required. In this study, a method of selecting ground motions for three-dimensional time history analysis of structures was developed in accordance with the criteria of seismic design code. In the method, the square roots of sum of squares for selected response spectra are very similar to the shape and size of the design spectrum. Also, the algorithm is simple, so takes a few seconds for selecting input ground motions. The proposed method is applicable to all target spectra which has only mean spectrum, such as design spectrum, uniform hazard spectrum or conditional spectrum.
구조물의 3차원 동적해석을 위한 내진설계기준의 지반운동 선정 조건 타당성 평가
하성진(Ha, Seong Jin) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
The purpose of this study was to evaluate of seismic design code criteria for ground motions selection to conduct three dimensional time history analysis. To evaluate ASCE 7-16 criteria, several nonlinear time history analyses of 3-story steel moment structures with regularities or torsional irregularities. The ground motions used in this study was selected by proposed procedure from a companion paper. In this paper, the results show that one can predict seismic responses of three dimensional structure within an error of 20% using more than 10 ground motions. However, if less than 7 ground motions are used, the responses may be overestimated.
지반운동의 상관관계가 구조물의 응답에 미치는 영향 평가
하성진(Ha, Seong-Jin),한상환(Han, Sang-Whan) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.2
For seismic design for high-rise buildings and special structures, linear or nonlinear response history analysis (RHA) have been used for estimating accurate seismic demands of structures. In order to obtain satisfactory analysis results, proper selection of input ground motions are very important. Current seismic design provisions require a set of multiple ground motions rather than a single ground motion. Several studies reported that Trial-and-error procedure did not provide accurate and consistent selection results. Several procedures were proposed to select ground motions which have the mean and variance of their response spectra matching target response spectrum mean and variance. This study considers correlation structure with mean and variance of target response spectrum for selecting ground motions. The effect of correlation structure on seismic demand on structures is evaluated. NGA data base is used to construct ground motion library and 20-story steel moment frame is considered as model frame. This study showed that the effect of correlation structure on the seismic demands of the structure can not be neglected when selecting ground motions.
3차원 시간이력해석을 위한 내진설계기준의 설계지진파 요구조건 타당성 평가
하성진(Ha, Seong Jin) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.7
To obtain reliable results for time history analysis of structure under earthquake loads, it is required to selecting proper input ground motions and constructing numerical model for the structure. Especially, for high-rise or irregular building, structural engineers should conduct three dimensional dynamic analysis. The purpose of this study was to evaluate of seismic design criteria for selecting ground motions to conducting three dimensional time history analysis of structures. For this purpose, 134 earthquake records which are composed of two horizontal ground motions, respectively, were collected. Then, several three dimensional time history analyses for 3, 9-story steel moment resisting structures with or without irregularities. Input ground motions were selected according to KDS 41 17 00 criteria for design ground motions using proposed method from a companion paper. The results show that one can predict seismic responses of three dimensional structure within an error of 20% using more than 10 ground motions. However, if less than 7 ground motions are used, the responses may be overestimated.
구조물의 3차원 동적해석을 위한 입력 지진기록 결정 방법과 적용
하성진(Ha, Seong Jin) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
The purpose of this study was to develop a proper method of selecting horizontal ground motions sets to conduct three dimensional dynamic analysis of structures. It is important to select proper ground motions for obtaining an accurate results from time history analysis of structures with a precise structure analysis model. In the developed procedure, selected ground motions are matched well with target mean response spectrum and satisfies the current seismic design codes. Also, the method is applicable to all target spectra which have mean response spectrum such as uniform hazard spectrum.