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홍기증,오창국 한국방재학회 2011 한국방재학회논문집 Vol.11 No.3
Recently, the cause of flood damage has been the local torrential rainfalls rather than a total amount of yearly rainfalls. The domestic design code of drainage pump is being improved by considering the effect of local torrential rainfalls, while there is no consideration on the local torrential rainfalls in the domestic design code of bridge-deck drainage. Compared with the code of Federal Highway Administration in USA, no rational bases are specified in the domestic design code of bridge-deck drainage. This paper proposes the reasonable design guideline for bridge-deck drainage considering the effect of local torrential rainfalls. 최근 들어 홍수피해를 유발하는 것은 강우의 총량이기보다 기후 변화에 따라 발생하는 국지성 집중호우라 할 수 있다. 이러한 국지성 집중호우를 고려한 강우강도 개념을 도입하면서 배수펌프장 등과 같은 국내 배수시설 설계가 최근 개선되고 있으나, 교량용 배수시설 관련하여 별다른 개정이 없는 실정이다. 또한, 미연방도로국의(FHWA)의 배수설비 기준에 비하여 국내의 교량용 배수시설 기준은 합리적인 배수관 설계 방법을 제시하지 못하고 있다. 이러한 문제점을 해결하기 위해, 국지성 집중호우를 고려한 확률강우강도식을 사용하여 합리적인 교량용 배수관경 설계 기준안을 본 논문에서 제시한다.
첨단복합소재 데크를 볼트결합한 조립식 아치가교의 거동분석
홍기증,이성우,최성호,금문성,Hong, Kee-Jeung,Lee, Sung-Woo,Choi, Sung-Ho,Khum, Moon-Seoung 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.3
유리섬유강화 폴리에스터(GFRP) 복합소재는 가볍고 내구성이 뛰어나 강재, 콘크리트, 나무 등과 같은 기존의 구조 재료들을 대체할 수 있는 재료로 최근 각광 받고 있다. 이러한 복합소재를 활용하기 위해 쉽게 조립할 수 있는 수직결구식 복합소재 데크를 활용한 아치가교 유형을 선행 연구에서 제안하였고 유한요소해석을 통해 검증하였다. 이 논문에서는 선행연구에서 제안된 볼트결합에 의한 복합소재 데크 조립식 아치가교의 안전성 및 사용성을 구조성능시험을 통해 검증하여 문제점을 파악하고 그 문제점을 해결하기 위해 개선된 아치가교 유형을 제안한다. Due to lightweight and high durability of glass-fiber reinforced polyester (GFRP) materials, they are promising alternatives to conventional construction materials such as steel, concrete and wood. As good application examples of GFRP materials, several types of temporary arch bridges were suggested and verified by finite element analyses in our previous study where snap-fit GFRP decks were applied. In this paper, we conduct a structural performance test to verify safety and serviceability of the temporary arch bridge, where snap-fit GFRP decks are assembled by bolts. The structural problems occurred in this test are also discussed and improvement of temporary arch bridges is suggested to resolve the occurred structural problems.
Geometry and Friction of Helically Wrapped Wires in a Cable Subjected to Tension and Bending
홍기증,이종구,이영기 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.2
Helically wrapped wire cables were first introduced to overcome the difficulties in transporting and installing straight wires. Presently, helically wrapped wire cables are used as the important load-carrying elements in many structures such as suspension bridges, cable-stayed bridges, tall guyed towers, power transmission lines, and flexible electrical conductors. In design and analysis, cables are traditionally assumed to carry axial load only; thus, studies on the bending behavior of the cables have been limited. Although the small curvature assumption of the cable may be valid for most part, the possible development of a large curvature at the bearings and anchorage cannot be ignored nor avoided. In this study, an analytical model was developed for the helically wrapped wires in a cable subjected to tension and small bending, with full consideration of the helically wrapped wire geometry. Using the developed model, an approximate upper limit of the cable curvature -for which the conventional Bernoulli-Euler-Navier kinematic beam assumption can be adapted to evaluate the stress in the wires- was obtained.
홍기증,최지혜,김현욱,주광호 한국지진공학회 2016 한국지진공학회논문집 Vol.20 No.5
Currently, researches are being actively conducted in assessing seismic performance of nuclear facilities in USA and Europe. In particular, applying this technique of assessing seismic performance to design of isolation systems in nuclear power plants is being performed and then ASCE 4 Draft (2013) is being revised accordingly in the United States. In order to satisfy the probabilistic performance objectives described by seismic responses with certain confidence levels (ASCE 43, 2005), the probability distributions of these responses have to be defined. What is the minimum number of input ground-motions to obtain the probability distribution precise enough to represent the unknown actual distribution? Theoretical basis, for how to determine the minimum number of input ground-motions for given a logarithmic standard deviation to approximate the unknown actual median of the log-normal distribution within a range of error at a certain level of confidence, is introduced by Huang et al. (2008). However, the relationship between the level of confidence and the range of error is not stated in the previous study. In this paper, based on careful reviews on the previous work, the relationship between the level of confidence and the range of error is logically and explicitly stated. Furthermore, this relationship is also applied to derive the minimum number of input ground-motions in order to approximate the unknown actual logarithmic standard deviation. Several recommendations are made for determining the minimum number of input ground-motions in probabilistic assessment on seismic performance of facilities in nuclear power plants.
홍기증,김지상 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
As concrete ages, the surrounding environment is expected to have growing influences on the concrete. As all the impacts of the environment cannot be considered in the strength-estimating model of a nondestructive concrete test, the increase in concrete age leads to growing uncertainty in the strength-estimating model. Therefore, the variation of the model error increases. It is necessary to include those impacts in the probability model of concrete strength attained from the nondestructive tests so as to build a more accurate reliability model for structural performance evaluation. This paper reviews and categorizes the existing strength-estimating statistical models of nondestructive concrete test, and suggests a new form of the strength-estimating statistical models to properly reflect the model uncertainty due to aging of the concrete. This new form of the statistical models will lay foundation for more accurate structural performance evaluation.
스냅-핏 착탈 연결부를 가지는 보도교용 복합소재 바닥판의 개발 및 적용
홍기증,박신전,이성우 한국복합신소재구조학회 2014 복합신소재구조학회 학술발표회 Vol.2014 No.04
In recent days composite bridge decks are increasingly used to new and rehabilitated bridges due to their many advantages such as light weight, high strength, high durability, low maintenance costs and fast installation. To further promote usage of composite bridge decks, the authors have developed decks of new profile having innovative vertical snap-fit connection. Through this development, significant enhancement of constructability and economy are obtained by overcoming the drawbacks of conventional composite decks of tongue-and-groove connection. The paper introduces some research results and notable applications for the developed composite decks of snap-fit connection using for pedestrian bridges. Owing to their considerable advantages of the developed composite decks, increasing number of applications is currently underway in Korea.