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기존 건축물 내진성능 향상을 위한 철골 골조 외부부착 보강공법
목지욱 ( Mauk Ji-wook ),박영미 ( Park Young-mi ),박기홍 ( Park Ki-hong ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
Seismic retrofitting technologies have been paid attention to structural engineers for rehabilitations of existing building structures vulnerable to seismic loading conditions. This paper introduces the traditional strengtheing method applying externally-bonded steel frames to column and beam elements, and compares with the improved scheme using the frames with additional energy dissipation systems. Throughout experimental studies, it was observed that the method can be effective for promoting the seismic performance of seismic force-resisting systems by guaranteeing strong column-weak beam mechanism. Compared to the traditional manner, it was found that the new scheme can be more efficient for confirming capacity design concept, while energy dissipation systems can provide additional damping effects corresponding to lateral deformation which occurs at seismic force-resisting systems exposed to seismic excitations.
거주자 사용성 확보를 위한 콘크리트 맨바닥 시공 품질 관리 기법
목지욱 ( Mauk Ji-wook ),최경석 ( Choi Kyung-suk ),김정진 ( Kim Jeong-jin ),석원균 ( Seok Won-kyun ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
The pre-qualification system related to floor impact noise is considered ineffective, and thus, the introduction of a post-verification system is being prepared. This is because the performance, which was notarized in the qualification test due to various reasons, was not uniformly confirmed on building construction fields. Industry practitioners perceive that this is due to the influence of factors such as the flatness, levelness and/or thickness of the floor. However, it is very difficult to confirm such facts in a short period of time on the fields, and since the practical application of technology to measure and evaluate quantitatively and the establishment of a system are insufficient, it cannot be said to be a problem that can be brought to the surface. In fact, even when considering the conventional measurement of the dynamic modulus of elasticity, measurements are performed under controlled variables, such as placing a 200mm×200mm buffer material on a flat test-floor. However, in the fields, it is common to lay down larger productions(for example, 900mm×600mm) on the bare floor where significant variables are not controlled, and to construct finishing layers corresponding to the pre-qualified floor system without separately confirming the realization of the dynamic modulus of elasticity in the field conditions. In this study, spatial information of the bare floor on the field was measured and evaluated through a laser scanner. Technical methods for assessing the smoothness, flatness, and thickness of construction surfaces were reviewed, providing key insights for grading the quality of construction based on these criteria. Through further detailed and thorough investigations, it is expected that results suitable for practical application and systematization will be derived.
바닥충격음 제어를 위한 표준바닥구조 시스템 성능에 관한 실험적 연구
목지욱 ( Mauk Ji-wook ),최경석 ( Choi Kyung-suk ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.2
중량 충격원에 의한 층간소음 문제가 공동주택 내에서 지속적으로 발생에 따라, 이를 제어할 수 있는 방법과 그에 대한 실효성 문제가 대두되고 있다. 그러나 국내 관련 기준 등은 유럽, 일본 등의 국외 기준을 참조하여 머물러 있는 실정이며, 관련 실험에 관한 연구가 체계적이고 연속적으로 이루어진 사례가 드물다. 본 연구에서는 바닥충격음 차단구조시스템이 적용되지 않은 맨바닥구조와 뜬바닥구조인 표준바닥구조시스템 각 1종을 선정하여 임팩트해머를 통한 진동특성을 파악하고, 현행 국내 기준을 바탕으로 바닥충격음 성능을 평가하여 비교분석하였다.
최경석(Choi Kyung-Suk),목지욱(Mauk Ji-Wook),김형준(Kim Hyung-Joon) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Shear walls have long been recognized as one of structural elements which can effectively control lateral response of a lateral-force-resisting system. Boundary elements in a special shear wall are required to satisfy strict detail requirements by current seismic design codes. From KBC2009 special shear wall systems was introduced as one of seismic-force-resisting systems. However, there is few researches and design applications of special shear wall systems to building frames. In this research, comparative seismic response between ordinary shear walls and special shear walls was performed for a prototype building.
바닥충격음 차단을 위한 뜬바닥 구조의 진동응답특성에 관한 실험적 연구
최경석 ( Choi Kyung-suk ),석원균 ( Seok Won-kyun ),목지욱 ( Mauk Ji-wook ),신이섭 ( Shin Yi-seop ),김형준 ( Kim Hyung-joon ),김정진 ( Kim Jeong-jin ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
A floating floor generally consists of mortar bed separated from the structural RC slab by a continuous resilient layer. It is known that the floating floors are a type of vibration-isolation system to improve the impact sound insulation performance. However, some researchers have demonstrated that the amplification of vibration response at a specific range of frequencies results in an increase in the impact sound level. This study carried out the forced vibration tests to obtain the frequency response function (FRF) of a floating floor compared with a bare RC slab. Test results shows that the additional peak occur in vibrational spectrum of the floating floor except natural vibration modes of the bare RC slab. This is because the relatively flexible resilient material and mass of the mortar bed offer an additional degree of freedom in the structural system. Therefore, it could be efficient for reduction of floor impact vibration and noise to control the additional mode frequency and response of floating floors.