보도교 상판의 감쇠율 분석

윤성원,문상현,Yoon, Sung-Won,Moon, Sang-Hyouen 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.4

In Seoul, total 27 places of foot-bridges were chosen to evaluate the damping ratio through vibration measurement by mobile-phone application. Model vibration test was performed to compare the natural frequency and damping ratio between the conventional accelerometer and mobile-phone application. Measured average damping was compared with the one of Bachmann. The relation between the damping ratio and span was also investigated. Measured average damping ratio was greater than that of Bachmann. It was shown that there is no distinct trend between damping and span.

고층건물 현장계측을 통한 거스트 계수 제안

윤성원,김도현,김영문,김동원,Yoon, Sung-Won,Kim, Do-Hyun,Kim, Young-Moon,Kim, Dong-Won 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.1

건물에 설치된 모니터링 시스템으로부터 기록된 바람과 구조물의 반응으로부터 평균풍속, 풍향, 난류강도, 거스트팩터를 산정하였다. 계측된 건물은 각각 속초와 부산에 위치한다. 거스트 계수와 난류강도사이의 관계를 이용하여 계측된 데이터로부터 이들 간의 상관관계식을 제안하였다. 계측된 데이터로부터 얻은 거스트 계수 관계식은 풍동실험과 고층건물설계의 타당성에 유용한 자료로 이용될 수 있다. The wind monitoring systems are installed in high-rise buildings to record wind response data. The measured buildings are located in Busan and Sokcho. The measured wind data are analysed in this paper to obtain the mean wind speed and direction, turbulence intensity and gust factor. By using the correlation between gust factor and turbulence intensity, the expression for gust factor based on wind data measured from the building is suggested. The field measurement data obtained here are useful for the validation of wind tunnel tests and the future design of tall building.

가성 부갑상선 기능저하증의 이형 석회화 치험례

윤성원,송재용,김정헌,Yoon, Sung-Won,Song, Jea-Yong,Kim, Chung-Hun 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.3

Purpose: Pseudohypoparathyroidism is a hereditary disorder characterized by symptoms and signs of hypoparathyroidism, typically in association with distinctive skeletal and developmental defects. Hypoparathyroidism is caused by a insufficient end-organ response to PTH (parathyroid hormone). Hypoparathyroidism consists of four types in which the most common form, pseudohypoparathyroidism-Ia, accompany with Albright's hereditary osteodystrophy. We experienced a case of a woman who had been suffering from calcified mass on left foot, diagnosed Albright's hereditary osteodystrophy. Methods: We present a case of a 24-year-old Korean female who visited plastic surgery department with a painful mass on dorsum of the left foot. On the physical exam, bony hard and painful mass, fixed to dermis, was noted. Plain X-ray films demonstrate suspicious calcification on subcutaneous tissue of dorsum of the left foot. The patient was diagnosed pseudohypoparathyroidism 2 years ago at the plastic surgery department. At the visiting time, the laboratory results were within normal range even though the patient actually had a disease. The reason is because the patient has been treated with Vit.D, calcium replacement therapy and thyroid hormone therapy. Moreover, the patient has been treated with anticonvulsant agents due to epilepsy. On the brain computer tomography (CT), calcification was noted on the basal ganglia and dentate nucleus. So we decided the total excision of entire mass from the left foot. Results: We excised main mass with numerous pinhead sized masses which were scattered around the main mass. The $6.0{\times}4.0{\times}0.5\;cm$ sized main mass was bony hard, and its surface was flat and margin was irregular. The permanent biopsy was confirmed that the main mass and all the scattered tiny masses were heterotopic calcification. The patient did not suffer from the pain after the mass excision. The wound has been healed without any problem. Conclusions: Heterotrophic calcification is often accompanied with pseudohypoparathyroidism, but such a huge one is uncommon. We report a case of pseudohypoparathyroidism with heterotrophic calcification developed in dorsum of left foot who was diagnosed by excisional biopsy.

국내외 장스팬 구조물의 고유진동수 비교

윤성원,박용,Yoon, Sung-Won,Park, Yong 한국공간구조학회 2009 한국공간구조학회지 Vol.9 No.1

최근의 대공간구조물은 장스팬화 됨은 물론이고 경량화되면서 면외 방향의 강성이 매우 작아지고 있다. 이로 인하여 공력불안정 진동의 발생 여부는 물론이고 연성구조물의 판단시에도 고유진동수의 정확한 산정이 필요하다. 그러나 국내외 대공간구조물의 고유진동수 제안식에 대한 연구는 매우 미흡한 실정이다. 따라서 국내 7개 공간구조물의 고유치해석에서 얻은 근사식을 일본건축학회 고유치해석에 근거한 2가지 제안식과 일본의 28개 공간구조물의 계측치에서 얻은 고유진동수 근사식을 비교하였다. 지붕의 고유진동수는 스팬이 증가함에 따라서 작아지는 경향을 확인하였다. 국내의 고유진동수 값은 전반적으로 일본의 공간구조물의 해석과 계측에 근거한 고유진동수보다 동일한 스팬에서 작은 경향을 보임을 알 수 있었다. 따라서 국내 공간구조물의 지붕은 일본의 경우보다 비교적 연성구조물인 것을 확인할 수 있다. As a recent spatial structure have become long-spaned and light, stiffness of out-plane is reduced significantly. Due to this, it is necessary to calculate natural frequency correctly to check if structure is flexible or vortex-induced vibration is occurred. However, formula of frequency in domestic and foreign spatial structure has not been performed deeply. In this study, approximated formula obtained by eigenvalue analysis of seven domestic spatial structure is compared with two suggestions based on Japanese standard and formula by measurement of 28 spatial structure in Japan. Natural frequency of roof has a tendency to be reduced as the span of structure increases. Natural frequency of domestic structure is generally less than that of analysis and measurement of spatial structure in Japan. Therefore, it is confirm that roof of domestic spatial structure is relatively rather flexible than that of Japan.

강풍시 고층건물의 진동특성 및 사용성 평가

윤성원,김도현,정석창,김동원,Yoon, Sung-Won,Kim, Do-Hyun,Jeong, Sug-Chang,Kim, Dong-Won 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.5

철골조 고층건물을 대상으로 풍응답계측을 실시하여, 감쇠율과 고유진동수의 진폭의존성을 검토하였다. 진폭의존성의 검토를 위하여 RD법을 사용하였다. RD법에 의한 진동특성을 하프파워법에 의한 진동특성과 비교하여 두 방법 사이의 상관관계를 분석하였다. 또한 일본, 캐나다기준에 의한 강풍시의 사용성평가를 통하여 두 가지 방법의 적용성을 검토하였다. RD법에 의하여 감쇠율의 진폭의존성을 확인하였으며, 고유진동수의 진폭의존성은 공학적인 의미에서 상대적으로 매우 작은 것을 확인하였다. 또한 계측건물은 사용성을 만족하였으며, 일본기준이 캐나다기준보다 더욱 엄격함을 확인하였다. After measuring wind induced response for a high-rise steel building, the damping ratio and natural frequency were analyzed in this paper. In order to examine amplitude dependence, random decrement method was used. Two methods were analyzed by comparing dynamic properties from random decrement method and half powered-band width method. In addition, through serviceability evaluation during strong wind, compatibility of two methods to Japanese guidelines for the evaluation of habitability to building vibration and national building code of Canada was considered. The amplitude dependence of the damping ratio by RD method was shown and the amplitude dependence of the natural frequency was relatively very small in an aspect of engineering sense. Moreover, the measured building was satisfied with serviceability and Japanese guideline is stricter than NBCC code.

하프파워법과 인력가진법에 의한 감쇠율 비교

윤성원,Yoon, Sung-Won 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.2

주파수영역과 시간영역의 두가지 방법을 통하여 감쇠율을 분석하였다. 11층${\sim}$19층 범위의 철근콘크리트 건물에 대하여 주파수 영역에서의 해석을 위한 상시진동과 시간영역에서의 해석을 위한 인력가진을 실시하였다. 하프파워법의 적용성을 검토하기 위하여 1024, 2048, 4096 세가지 앙상블 샘플사이즈에 대하여 분석하였다. 인력가진법에 의한 장변과 단변의 감쇠율은 각각 1.05%${\sim}$1.22%과 1.16%${\sim}$1.50%이다. 하프파워법은 감쇠율을 약간 과대평가할 수 있지만, 계측데이터의 길이를 가능한 길게 하여 bandwidth를 작게 하면 감쇠율 평가의 정밀도를 향상할 수 있었다. This paper is concerned with the damping ratios of two methods, which are frequency domain and time domain approach. Ambient vibrations and synchronized human excitation test were conducted to three reinforced concrete buildings ranging from eleven to nineteen stories. The performance of the half power bandwidth method was investigated using three kinds of sample size, 1024, 2048, and 4096. The damping ratio by synchronized human excitation ranges from 1.05% to 1.22% in the long direction and from 1.16% to 1.50% in short direction. Damping by half power bandwidth method is slightly more overestimated than the synchronized human excitation due to insufficient record length. Damping evaluation by half power bandwidth method was found to be enhanced by using the narrower bandwidth with long recorded data.

상시진동의 Stationarity와 동적특성의 평가

윤성원,Yoon, Sung-Won 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.2

동적특성 평가기술을 이용한 국외 리모델링 사례

윤성원,Yoon, Sung-Won 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.6

포스트텐션 중공슬래브의 동적 특성

윤성원,Yoon, Sung-Won 한국공간구조학회 2012 한국공간구조학회지 Vol.12 No.3

바닥슬래브의 처짐과 차음 성능을 개선하기 위하여 포스트텐션 중공슬래브가 최근에 자주 사용되고 있다. 동일한 8m 스팬 1층구조물을, 한 구조물은 일반슬래브(solid slab)로, 다른 구조물은 중공슬래브(void slab)로 2개를 제작하여 각 구조물의 바닥슬래브에 포스트텐션을 도입하였다. 중공슬래브의 고유진동수와 감쇠율의 진동특성을 일반슬래브와 비교하였으며, 포스트텐션 도입 후에 일반슬래브와 중공슬래브 각각에 있어서 고유진동수와 감쇠율의 진동특성을 상호 비교하였다. 210mm의 일반슬래브 보다는 250mm 중공슬래브의 1차 고유진동수가 큰 것을 알 수 있다. 포스트텐션 도입 후에도 중공슬래브의 1차 고유진동수는 일반슬래브 보다 큰 것을 알 수 있다. 일반슬래브와 보이드슬래브의 감쇠율은 포스트텐션 도입 전과 도입 후에 거의 동일한 값을 보이는 것을 확인하였다. Post-tensioned void slab is frequently used for improving the deflection and sound proofing. Two one story 8m spanned structures were built. One structure applied post-tensioned solid slab, but the other did post-tensioned void slab. Dynamic characteristics, which is natural frequency and damping ratio, was compared between that of solid slab and void slab before and after post tension. The natural frequency of void slab was greater than that of solid slab before and after post tension. It was shown that damping ratio of solid slab and void slab was almost same at two stages.

다중이용시설에서의 테러 예방 디자인

윤성원,이경훈,김지현,Yoon, Sung-Won,Lee, Kyung-Hoon,Kim, Ji-Hyeon 한국공간구조학회 2009 한국공간구조학회지 Vol.9 No.3