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CFTA 거더교의 시공중 구조 안전성 및 공용중 진동사용성 평가
이상윤,박경훈,김정호,김두기,Lee. Sang Yoon,Park. Kyung Hoon,Kim. Jung Ho,Kim. Doo Ki 한국방재학회 2012 한국방재학회논문집 Vol.12 No.6
CFTA(Conccrete Filled Tubular Arch) 거더교는 CFT(Concrete Filled Tube) 구조, 프리스트레스 구조 및 아치구조의 특징을 복합화 하여 구조적 효율과 경관을 향상시킨 새로운 교량 형식이다. 새로이 제안된 형식의 교량을 실교량에 적용하기 위해서는 공용중 안전성 뿐만 아니라 시공중 안전성에 대한 검증이 필요하다. 또한, CFTA 거더는 경간 중앙부에서 상대적으로 슬림한 단면을 갖기 때문에, 진동사용성에 대한 검토가 추가적으로 요구된다. 본 연구에서는 CFTA 거더교의 시공중 안전성과 진동특성을 검토하기 위하여, 실물모형실험체를 제작하고 진동실험을 수행하였다. 진동실험 결과를 바탕으로 검증된 유한요소모델을 이용하여 이동하중을 고려한 동적해석을 수행하였으며, 해석결과를 바탕으로 CFTA 거더교의 진동사용성을 검토하였다. 실물모형실험체 및 유한요소모델을 이용한 시공중 안전성 및 진동사용성 검토 결과, CFTA 거더는 시공중 안전성을 확보하고 있는 것을 판단되며, 우수한 진동사용성을 보유하고 있는 것으로 나타났다. The CFTA (Concrete Filled Tubular Arch) Girder bridge is a new type of bridge which improves the structural efficiency and the aesthetics by combining the characteristics of the CFT (Concrete Filled Tube) structure, PS (Pre-Stressed) structure, and arch structure. Before applying the proposed type of bridge to the real bridges, the structural safety should be evaluated not only in service but also under construction. Because the CFTA Girder bridge has the relatively slim section in the middle of the span, the vibration serviceability should be evaluated additionally. In this study, the real-scaled specimen of the CFTA Girder bridge was fabricated and the vibration test was conducted to evaluate the structural safety under construction and the vibration serviceability in service. The dynamic analysis considering the moving load was conducted by using the FE (Finite Element) model verified with the results of the vibration test. The results of the dynamic analysis reveal that the CFTA Girder bridge has the structural safety under construction and the excellent vibration serviceability.
이상윤,이황 한국경쟁법학회 2019 競爭法硏究 Vol.40 No.-
The concept of “search neutrality” is currently resonating in Korea as a guiding principle for competition law and/or digital platform regulation. The Korea Communications Commission adopted the so-called platform neutrality guidelines in 2017 and Korea’s competition authority, the Korea Fair Trade Commission, is likely to bring a competition action against search engines and platforms on the potential allegation of ‘non-neutral’ practices. Against this backdrop, the present paper questions the appropriateness of the concept of “search neutrality” as a guiding principle for Korea’s competition law and/or government regulation. To answer to that question, this article explores theoretical literature concerning the meaning of ‘search neutrality’ and examines the experiences of the United States (‘US’) and the European Union (‘EU’) in which the neutrality concept emerged, and concerns with search bias have been discussed in terms of ex ante and/or ex post regulation. Through this, the appropriateness and feasibility of search neutrality as a competition and/or regulation principle is analysed and reviewed. The research findings firstly show that the concept of search neutrality, in contrast to the analogous concept ‘net neutrality’, comprises a serious problem of definitional ambiguity and is based on the groundless premise that search services are indispensable or essential. Secondly, it is found that search neutrality has failed to guide competition policy and regulation in the US and the EU. Although the EU’s new Platform Regulation (Reg.2019/1150) and the Commission’s decision on Google’s self-preferencing may, to some extent, be pertinent to the search bias concerns, the authors clarify distinctions between search neutrality advocacy and the EU’s digital policy. As a conclusion, this study argues that any regulatory restraint towards search engines based on neutrality would be permissible and feasible only if it sticks to the basic principles of competition law, id est, the protection of consumer welfare or that of effective competition structure.