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서형열,박광순,김익현,김동수 한국지진공학회 2014 한국지진공학회논문집 Vol.18 No.5
This study reviews the status and validity of seismic design criteria (SDC) for major facilities in Korea, which are composed of performance criteria and technical standard. Various facilities with different seismic design response spectra are analyzed to identify their seismic performance and necessity of eventual retrofit. The results are used to derive improvement directions of SDC. It is also concluded that the technical standard should be improved after the revision of the performance criteria.
PSC-I 거더교의 지진취약도 평가를 위한 HAZUS 방법의 국내 적용성 연구
서형열,이진학,김두기,송종걸 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.2
교량구조물의 지진재해평가기술을 개발하기 위해서는 전체 교량에 대한 분류체계별 표준교량을 선정한 후, 간편한 정식화 방법을 통해 지진취약도를 분석하고, 이로부터 교량의 근사적인 지진위험도를 평가하는 것이 현실적이라 할 수 있다. 본 연구에서는 HAZUS에서 사용 중인 간편하면서도 실용적인 방법을 미국과 국내의 내진설계수준 등을 고려하여 국내 PSC-I 거더교에 적용 가능하도록 ‘수정된 HAZUS 방법에 의한 한국형 지진취약도함수’를 개발하였다. 이를 위해 국내 표준교량 형식 중 하나인 PSC-I 거더교에 대해 수치해석적 방법을 적용하여 해석적 지진취약도함수를 구하고, 수정된 HAZUS 방법을 적용하여 지진취약도함수를 구한 후 그 결과를 비교·분석하였다. 수정된 HAZUS 방법에서의 주요 계수는 수치해석적 방법에 의한 지진취약도함수와 가장 유사한 경향을 보이도록 하는 계수를 선택하는 방법으로 결정하였으며, 강도감소계수의 경우 HAZUS에서 제시한 값의 70% 수준을 사용할 때 해석적 결과와 유사한 지진취약도 함수를 구할 수 있음을 알 수 있었다. To reduce the amount of seismic damage, several design codes are being improved considering the earthquake resistant systems, and many researches are being conducted to develop the earthquake damage evaluation techniques. This study develops the Korean seismic fragility function using the modified HAZUS method applicable to PSC-I girder bridges in Korea. The major coefficients are modified considering the difference between the seismic design levels of America and Korea. Seismic fragility function of the PSC-I girder bridge (one of the standard bridge types in Korea) is evaluated using two methods: numerical analysis and modified HAZUS method. The main coefficients are obtained about 70% of the proposed values in HAZUS. It is found that the seismic fragility function obtained using the modified HAZUS method closes to the fragility function obtained by conventional numerical analysis method.
Dynamic behavior of an FRP Deck under Moving Wheel Loading : 윤하중을 받는 FRP바닥판의 동적거동에 관한 연구
서형열(Seo Hyeong Yeol),김두기(Kim Doo Kie),취진타오(Cui Jintao),박기태(Park Ki Tae),이영호(Lee Young Ho) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
Fiber reinforced polymer(FRP) composite decks are new to bridge applications and hence not much literature exists on their dynamic behavior. As the traffic loads that bridges suffered are mainly moving loads, so the dynamic behavior of FRP decks are very important in the design of bridges using FRP decks. In this paper, a simple model was selected to make numerical simulations and experimental tests. The main interest of this research is categorized into two pats: dynamic characteristics of FRP deck and dynamic responses under moving loads. In the dynamic characterization, the comparison of the natural frequencies under different boundary conditions shows that boundary condition is one of factors that have great effect on the natural frequencies. To obtain the frequency response function (FRF) from testing data is a valid way to verify the corresponding numerical model. In the part of dynamic response under moving load, there were shifts between results obtained by numerical analysis and experimental tests, which are mainly because the load applied in numerical analysis was different from the actual load.
서형열 ( Seo Hyeong Yeol ),김두기 ( Kim Doo Kie ),취진타오 ( Cui Jintao ),박기태 ( Park Ki Tae ),이영호 ( Lee Young Ho ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
Fiber reinforced polymer(FRP) composite decks are new to bridge applications and hence not much literature exists on their dynamic behavior. As the traffic loads that bridges suffered are mainly moving loads, so the dynamic behavior of FRP decks are very important in the design of bridges using FRP decks. In this paper, a simple model was selected to make numerical simulations and experimental tests. The main interest of this research is categorized into two pats' dynamic characteristics of FRP deck and dynamic responses under moving loads. In the dynamic characterization, the comparison of the natural frequencies under different boundary conditions shows that boundary condition is one of factors that have great effect on the natural frequencies. To obtain the frequency response function (FRF) from testing data is a valid way to verify the corresponding numerical model. In the part of dynamic response under moving load, there were shifts between results obtained by numerical analysis and experimental tests, which are mainly because the load applied in numerical analysis was different from the actual load.
축방향철근의 겹침이음길이에 따른 원형 RC교각의 내진성능평가
박광순,서형열,김태훈,김익현,선창호 한국지진공학회 2014 한국지진공학회논문집 Vol.18 No.4
The plastic hinge region of RC pier ensures its nonlinear behavior during strong earthquake events. It is assumed that the piers secure sufficient strength and ductility in order to prevent the collapse of the bridge during strong earthquake. However, the presence of a lap-splice of longitudinal bars in the plastic hinge region may lead to the occurrence of early bond failure in the lap-splice zone and result in significant loss of the seismic performance. The current regulations for seismic performance evaluation limit the ultimate strain and displacement ductility considering the eventual presence of lap-splice, but do not consider the lap-splice length. In this study, seismic performance test and analysis are performed according to the cross-sectional size and the lap-splice length in the case of longitudinal bars with lap-splice located in the plastic hinge region of existing RC bridge columns with circular cross-section. The seismic behavioral characteristics of the piers are also analyzed. Based upon the results, this paper presents a more reasonable seismic performance evaluation method considering the lap-splice length and the cross-sectional size of the column.
김두기,김동현,서형열,이창주 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 논문집 Vol.11 No.5
연구에서는 정적 풍하중에 대한 교량의 취약도 평가 방법을 제시하였으며, 이를 이용하여 대상 교량인 6경간 엑스트라도즈드교에 대하여 정적 풍하중 취약도 분석을 수행하였다. 정적 풍하중산정과 하중조합은 국내 설계기준을 사용하여 산정하였으며, 이때 정적 풍하중에 대한 불확실성과 확률분포 특성은 난수를 사용하여 고려하였다. 취약도 곡선은 대수 정규분포함수의 형태로 나타내었으며, 이때 변수인 중간값과 대수표준편차는 최우도추정법(maximum likelihood method)에 의하여 구하였다. 취약도 분석을 수행한 결과 대상교량은 정적 풍하중에 대하여 안전한 것으로 평가되었다. This study presents fragility curves for the wind fragility analysis of a six-span extradosed bridge. The loads and corresponding load combinations are calculated using domestic design codes. Random variables are utilized to considering the uncertainties of the input variables for wind loads. The fragility curve is represented as a log-normal distribution function, in which two parameters are estimated by the maximum likelihood method. The results show that the extradosed bridge is safe to suffer static wind forces.