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강재 트러스교의 해석에 의한 피로설계기준 비교 및 검토
김상석 ( Kim Sang-seog ),정희영 ( Jung Hie-young ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.3
강교의 구조적 거동은 강도 및 사용성이 충족되고, 피로안전성이 확보될 때 공용수명을 충분히 확신할 수 있다. 그러나, 현재 교량의 피로에 관한 연구들은 상당히 부족하여 이 분야에 대한 지속적인 연구가 절실히 요구된다. 본 연구는 강교의 장기적인 피로안전성을 확보하기 위해서 실무에 적합한 피로설계지침의 방향을 제시함을 목표로 수행되었다. 연속된 강재 트러스교에 실교통량의 누적빈도수를 적용시켜 분석한 결과, 국내 의 피로설계규정은 응력범위와 피로강도가 국외의 주요 설계기준에 비하여 과대평가 되는 것으로 나타난다. 따라서, 향후 국내의 피로설계지침에서는 피로설계조항들이 피로설계에 합리적으로 규정되는 것이 필요하다. The service life of steel bridges can be assured only when their strength, serviceability and fatigue safety are fulfilled. However, at the present time, the continuous research for fatigue of steel bridges is desperately required since not much research work has been done so far. In this study, a guideline on the fatigue design is suggested for the practical purpose in order to establish the long-term safety of steel bridges against fatigue. The continuous steel truss bridge was analyzed for the cumulative reversals of the actual traffic, stress ranges and fatigue strength. From the results, the domestic fatigue design procedure was found to be fairly overestimated in comparison to the design code of other foreign countries. Therefore, it is necessary to review the current fatigue design specifications and have the new and rationalized design criteria in the future domestic fatigue design guidance.
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김상석(Kim, Sang Seog),정문오(Jeong, Moon Oh),황재훈(Hwang, Jea Hoon) 한국지역개발학회 2017 韓國地域開發學會誌 Vol.29 No.4
This study has analyzed the present state and the effects of REITs on the share price and has presented ways to improve the system based on policy-based implications. The key conclusions of the analysis on the present state and the effects of REITs on the share price are as follows. First, the national interest in REITs is on the rise in the long term but has seen a slowdown in its growth in recent years. This indicates that people have still difficulties in getting access to indirect investment of real estate as REITs have grown in the form of unlisted private investment despite their external growth. Second, REITs focus their investment in office buildings, especially in downtown and Gangnam areas, featuring very strong clustering in terms of spatial characteristics. However, the development-oriented REITs focus on residential housings mostly in non-Seoul metropolitan area, which indicates strong potentials in provincial metropolitan cities as these REITs still keep their presence in Seoul metropolitan area. Therefore, although REITs are expected to continue a steady grow, there is a need to pay attention to their growth patterns. Third, the listed REITs are affected by macroeconomic factors, including government bonds, corporate bonds, KOSPI and land prices, and additionally by capital money as well. Although the size of capital has a positive effect on the share price of REITs but the actual size of capital of the listed REITs does not even reach the average of all commercially available REITs. This indicates that the regulations imposed on the listed REITs not only shrink the number of REITs but also make it hard to secure capital investment. All of these phenomena raise a need for improving on unreasonable regulations along with the consideration of support policies in order to ensure a sustainable growth of REITs.
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권인규 ( Kwon In-kyu ),김상석 ( Kim Sang-seog ),정희영 ( Jung Hie-young ),이창수 ( Lee Chang-soo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The Bridge which is located at Jangji-dong, has served for about six years. But lots of cracks on its piers are discovered recently. The cause of the vertical cracks along the pier column is mainly related to the structural design of the pier. In this paper, we discuss about appropriate reinforcement and repair method on the cracked piers when the monitoring techniques are used and their results are effectively analysed.
ScienceON
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