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전종수 한국낙농육우협회 1997 낙농·육우 Vol.17 No.10
낙농산업의 안정적인 발전을 위하여는 집유체계의 일원화를 기하여 전체 낙농가가 참여 하는 계획생산과 전체 유가공 업체가 참여하는 수급체계를 안정화 함으로서 원유가격의 안정을 도모하고, 원유검사를 공영화 함으로서 유가공업체의 독단을 방지하여 낙농가의 안정적 수입을 보장하여야 할 것이라 하겠다.
전종수,Abdollah Shafieezadeh,Reginald DesRoches 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.5
This paper presents the results of an assessment of the seismic fragility of a long, curved multi-frame bridge under multi-support earthquake excitations. To achieve this aim, the numerical model of columns retrofitted with elliptical steel jackets was developed and validated using existing experimental results. A detailed nonlinear numerical model of the bridge that can capture the inelastic response of various components was then created. Using nonlinear time-history analyses for a set of stochastically generated spatially variable ground motions, component demands were derived and then convolved with new capacity-based limit state models to obtain seismic fragility curves. The comparison of failure probabilities obtained from uniform and multi-support excitation analyses revealed that the consideration of spatial variability significantly reduced the median value of fragility curves for most components except for the abutments. This observation indicates that the assumption of uniform motions may considerably underestimate seismic demands. Moreover, the spatial correlation of ground motions resulted in reduced dispersion of demand models that consequently decreased the dispersion of fragility curves for all components. Therefore, the spatial variability of ground motions needs to be considered for reliable assessment of the seismic performance of long multi-frame bridge structures.
Fragility characteristics of skewed concrete bridges accounting for ground motion directionality
전종수,최은수,노명현 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.5
To achieve this goal, two four-span concrete box-girder bridges with typical configurations of California highway bridges are selected as representative bridges: an integral abutment bridge and a seat-type abutment bridge. A detailed numerical model of the representative bridges is created in OpenSees to perform dynamic analyses. To examine the effect of earthquake incidence angle on the fragility of skewed bridges, the representative bridge models are modified with different skew angles. Dynamic analyses for all bridge models are performed for all earthquake incidence angles examined. Simulated results are used to develop demand models and component and system fragility curves for the skewed bridges. The fragility characteristics are compared with regard to earthquake incidence angle. The results suggest that the earthquake incidence angle more significantly affects the seismic demand and fragilities of the integral abutment bridge than the skewed abutment bridge. Finally, a recommendation to account for the randomness due to the ground motion directionality in the fragility assessment is made in the absence of the predetermined earthquake incidence angle.
비내진 상세를 갖는 철근콘크리트 교량의 응답에 대한 수직방향 지진파의 영향
전종수 한국복합신소재구조학회 2016 복합신소재구조학회논문집 Vol.7 No.4
This research describes the impact of vertical earthquake components on the performance of typical non-ductile bridges. To achieve this goal, this research chooses a non-seismically designed reinforced concrete bridge typically found in the California area. Particularly, their columns with inadequate design have a higher possibility of shear failure. To consider this failure, the column model reflects shear-axial interaction effect and is verified by comparing simulated results and experimental data available in literature. Two computational bridge models having column shear model subjected to constant and varying axial load are then built to conduct inelastic dynamic analyses. The responses are employed to construct probabilistic seismic demand models for two bridge models. This results indicate that the consideration of shear-axial interaction effect increases the seismic demand of all bridge components in non-ductile bridges, resulting in their increased seismic vulnerability.