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LGFOS를 이용한 보-기둥 부재의 부재력 계측 기법 개발
박효선,백재민,이홍민,Park, Hyo-Seon,Baek, Jae-Min,Lee, Hong-Min 한국방재학회 2006 한국방재학회논문집 Vol.6 No.3
기존 대부분의 구조물 건전도 모니터링 시스템에서는 제한적인 위치와 범위에서의 변형률 계측이 가능한 국부 변형률 센서를 이용하여 구조물 또는 구조 부재의 부재력을 계측하고 이에 기반하여 구조 안전성을 평가하고 있다. 그러나 실 구조물의 부재력 계측을 통한 안전성 평가는 하중의 크기 및 분포에 대한 불확실성 등의 다양한 이유로 부재 내 최대응력 작용점을 정확하게 파악하기 어렵다. 이러한 경우 구조물의 사이즈에 비하여 센서의 길이가 미소한 국부 변형률 센서를 이용한 안전성 평가의 적절성은 센서의 위치 및 개수에 좌우되는 한계를 가지게 된다. 이러한 한계를 극복하기 위하여 센서의 수를 증가시키면 처리해야하는 데이터의 양과 비용이 증가하게 되므로 현실적인 적용성에 문제점을 가지게 된다. 그러므로 본 연구에서는 이러한 한계와 문제점을 극복할 수 있는 대안으로 장대광변형센서에 의한 평균변형률을 이용한 보-기둥의 부재력 계측 기법을 제시하였다. In structural health monitoring, the safety of structural members are assessed by the level of stress measured by various strain sensors based on different sensing mechanisms. Since most existing strain sensors used for health monitoring system can cover a relatively small range of structural members, it is very difficult to measure the maximum value of the member subjected to varying amount and types of loads with those point sensors. The reliability of assessed safety of a member may be improved by increasing the number of sensors. It may not be also realistic to increase the number of sensors to overcome these drawbacks. In this paper, a stress measuring method for beam-column members is developed by estimating the maximum stress based on the average strains obtained from long gauge sensor. The average strain from long gage fiber optic sensor is transformed into the maximum strain by multiplication of the modification factor derived in this research.
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박효선,서지현,Park, Hyo Seon,Seo, Ji Hyun 한국강구조학회 2005 한국강구조학회 논문집 Vol.17 No.3
고층 건물 변위설계는 고층건물 설계의 핵심 기술 중의 하나이며, 재분배 기법은 실용적인 고층건물 변위설계법으로 인식되고 있다. 재분배 기법은 구조 물량을 재분배함으로서 전체 구조물량의 변화없이 제어하고자 하는 변위를 최소화시키는 방법으로서, 재분배기법 적용에 의해서 최종 얻어지는 물량은 초기 물량의 영향을 받게 된다. 초기 물량이 과다한 모델의 경우, 재분배 기법을 적용하면 허용 변위는 충분히 만족하지만 물량 측면에서는 그 만큼의 절감 여지를 내포하고 있다고 볼 수 있다. 그러므로 중량 조절계수를 구조정식화에 포함시켜서 변위설계시 초기 설계안의 물량에 영향을 받지 않는 고층건물 변위설계 기법을 개발하였다. 제안된 변위설계법을 프레임-전단벽 구조물의 변위설계에 적용하여 그 결과를 분석한 결과, 제안된 방법은 초기 물량의 영향을 받지 않으며 고층건물 변위설계가 가능하였다. Drift design is one of the core techniques in the structural design of high-rise buildings and resizing technique is regarded as a practical drift design method for high-rise buildings. In the resizing technique, the structural weight is re-distributed to minimize the target displacement without a change in structural weights. However, the structural weight determined from resizing algorithm is bound to the structural weight based on the preliminary design. Therefore, in this paper, a drift design method that can control the weight of the structure without causing drift control performance to deteriorate is proposed by incorporating the weight control factor in the formulation of resizing algorithm. The proposed drift design method is applied to the drift design of two frame-shear wall systems. The proposed drift design method, in this study, makes it possible to control both the drift and weight of a high-rise building.
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박효선(Hyo Seon Park),유은종(Eun Jong Yu),주영규(Young Kyu Ju),송화철(Hwa Cheol Song),안재현(Jae Hyen Ahn),박칠림(Chil Lim Park) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2
As the building increases in height, the lateral deformation of the building due to wind or seismic loads becomes of primary concern. The excessive lateral deformation or story drift causes failure of both structural elements and nonstructural elements. The calculated deformation and drifts at the final design stage must be check not to exceed the specified limits proportional to the building height. Thus, the amount of material required for a tall building is determined by the structural stiffness criteria rather than member strength criteria. While research activity has been reported in the literature on development of structural optimization algorithms based on sensitivity analysis, no practical algorithm has been reported on their application to structural design of tall buildings. Therefore, the selection of determining elements for the drift control of a tall building at the final design stage heavily depends on structural designer`s heuristics based on his design experience. In this paper, the unit load method for calculating displacement of structures are explored to identify the controling elements for lateral deformation and drift in a tall building. Based on the unit load method, the lateral displacements of the models are reduced by 49.1% and 39.4% without changing the total weights of the structures.
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초등학교 방과후 영어 수업에 나타난 학생-교사 상호작용 연구 Vol.20 No4
박효선(Park Hyo sun),박선호(Park Seon Ho) 한국초등영어교육학회 2014 초등영어교육 Vol.20 No.4
This study aims to analyze interactions between teachers and students in the first and second graders' after-school classes. The data was collected through classroom observations and audiotapes. The researcher's field notes and interviews with five teachers(two English native teachers, two Korean English native teachers, and a Korean English teacher) were also included. The results are as follows. First, most utterances observed were initiated by the teachers mainly through giving information, asking display questions, and giving directions to students in after-school English classes. Second, the most frequent type of students' utterances was dependent on the talks led by the teachers. Students' utterances also tended to be more active especially when they express their opinions to the teachers and fellow students. Third, activities from supplementary materials, rather than those from the textbook only, influenced more positively on students' active talks and stimulated interactions between teachers and students. Finally, the native language of teachers influenced on their classroom English use despite the fact that all teachers had excellent English competence. Based on these findings some suggestions are made for the after-school English programs for lower grade students in the future.
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