• Journal of KSNVE
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• v.22 no.2
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• pp.15-19
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• 2012

• Journal of the Korea institute for structural maintenance and inspection
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• v.21 no.3
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• pp.86-92
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• 2017

The possibility to development of floor vibration problem is larger in case of long span structure under service loads. Therefore, to improve the vibration performance of the floor, increasing of its thickness is a common method. But, increasing of thickness can lead to increase of slab self weight and reduce the effectiveness of the building. For this reason, attention for voided slab which reduces the self-weight is increasing. Hence, voided deck slab combined with deck plate and polystyrene void foam which has buoyancy prevention capacity and much developed construct ability has bee developed. By using the developed voided slab, vibration performance of a mock-up building structure has been investigated in the current study. The results according to analysis showed that they can be implemented in living and bedroom which are considered as 1st grade on the basis of "Residential Evaluation Guidelines for Vibration of Buildings" by the Architectural Institute of Japan.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.221-224
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• 2004

드라이 펌프(Dry Pump)는 청결을 요구하는 반도체 생산 공정에 많이 사용하고 있다. 오늘날 반도체 수요의 증가와 함께 드라이 펌프의 수요도 늘어나고 있다. 그에 각 반도체 회사들은 진공 펌프의 선정이 매우 중요한 문제 중 하나로 대두대고 있다. 진공 펌프를 위한 종합 성능 평가 장치의 개발은 이들 회사에서 요구하는 펌프의 성능을 종합적으로 평가함으로써 펌프 선정의 중요한 근거 자료로 사용 할 수 있을 것이다. 본 연구에서 구축한 종합성능 평가 장치는 진공 펌프의 최대 도달 진공도(Ultimate Pressure), 배기속도(Pumping Speed), 전력 소비(Power Consumption), 진동(Vibration) 그리고 음향 파워(Sound Power)등과 같은 종합적인 성능을 한번에 평가 할 수 있다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.54-57
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• 2012

지진에 의한 2차 피해 중 화재로 인한 피해가 거의 대부분이다. 따라서, 소화설비의 내진설계는 반드시 필요하며 소화능력을 유지해야 한다. 본 연구에서는 진동대 실험을 통하여 스프링클러 설비의 내진성능을 평가하였다. 스프링클러 설비의 내진성능을 평가하기 위하여 일반 설비와 내진처리가 된 설비를 동시에 시공하여 그 성능을 평가하였다. 또한, 시설물의 거동특성을 파악하기 위하여 시설별 변위응답, 가속도 응답, 가속도 응답스펙트럼을 통하여 시설물에 대한 내진성능을 평가하였다.

• Journal of Korean Society of Steel Construction
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• v.26 no.6
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• pp.511-522
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• 2014

In this study, an innovative steel stair system is presented which enables rapid erection and high quality control in both residential and office building construction. This system features two lightweight steel stringers of box shape, bolted connections easy to absorb construction tolerance, and stair steps movable transversely (or sliding steps) such that the work space needed for concrete stairway wall could be easily provided. In this type of stairway system, other than providing robust connecting details, ensuring vibration performance is especially important since this system may be vibration-sensitive due to lightweight nature and/or probable low damping. To tackle these issues, a series of full-scale mock-up tests were conducted by using box-shape stringer members with or without concrete-fill. The connection system was shown to be sufficiently stiff and strong, or it remained elastic even under the 160% of service load level. Among the seven stringer alternatives, five exhibited satisfactory vibration performance according to the related North American and European acceptance criteria.

• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.4
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• pp.45-58
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• 1997

This paper describes a series of shaking table and pseudodynamic tests for evaluation of seismic performance of base-isolated structures subjected to various seismic earthquake inputs. The main objectives of this study are : (1) evaluation of the effectiveness of base-isolation systems for low-rise structures against severe seismic loads through shaking table tests, (2) verification of the substructuring pseudodynamic test method for the base-isolated structures in comparison with the shaking table test results. In the shaking table test, a quarter scaled three-story structure base-isolated by laminated rubber bearings is tested. In the pseudodynamic test, only the laminated rubber bearing s are tested using the substructuring technique, while the concurrent seismic responses of the superstructure are computed using on-line numerical integration. Comparison with the shaking table test results indicates that the substructuring pseudodynamic test method is very effective for determining the dynamic responses of the base-isolated structure.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.04a
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• pp.691-692
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• 2012

• Journal of the Earthquake Engineering Society of Korea
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• v.14 no.5
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• pp.23-31
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• 2010

In this study, a shaking table test was performed for the evaluation of the failure capacity of an anchor foundation system in the case of an aged condition. For the shaking table test, three kinds of specimens were manufactured as follows: 1) a non-damaged anchor; 2) a specimen with cracks running through the anchor; and 3) a specimen with cracks along the expected corn-shape fracture away from the anchor. A dynamic characteristic was determined through a measurement of the frequency response function (FRF), and the seismic capacity was evaluated by using a shaking table test. Failure capacities were calculated using an acceleration response and it was compared with the anchor design code.

• Bulletin of the Society of Naval Architects of Korea
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• v.31 no.3
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• pp.36-42
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• 1994

고품질 선박 평가의 중요한 척도인 진동허용 기준에 대한 관심이 점차 높아지고 있다. 진동 허 용기준은 선박 계약시 건조사양에 포함될 뿐 아니라 건조후 시운전 결과 평가시나 인도후 아프터 서비스 과정에서도 선주와 건조자간에 자주 거론되는 항목이다. 평가 관점으로서는 .승무원의 거주성 및 작업성 .구조 부재의 피로파괴 발생 가능성 .기계기기 기구들의 성능 보존성 등이 있으며 IOS(국제표준화기구)나 여러 선급 기준들이 사용되고 있다. 그러나 보다 쾌적한 거주구나 작업 구역을 원하는 탑승자들의 욕구가 커짐에 따라 최근 저 진동선을 요구하는 선주 들의 허용기준에 대한 관심 또한 늘어나고 있다. 이에 따라 IOS는 선박진동의 종합평가 기준인 IOS 6954 개정 작업을 진행중에 있으며 일부 선급에서도 자체적으로 보완한 기준들을 제시하고 있다. 반면에 조선소들의 입장에서 보면 그간 진동 예측 방법과 방진설계 기술이 발전된 덕분에 심각한 진동문제는 많이 줄어들었다 하겠으나 90년대 아후 선박의 고속화에 따른 기진력 증가로 인하여 저 진동 선박 건조가 쉽지만은 않은 것이 최근의 상황이다. 따라서 본 고에서는 현재 사용되는 각종 선박진동 허용 기준들을 다시 정리하고 그중 강화될 전망이 있는 거주구 진동 허용기준에 대한 변화 추세를 살펴보고자 한다.

• Journal of the Earthquake Engineering Society of Korea
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• v.13 no.5
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• pp.11-21
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• 2009

Considering that the weight of a biaxial hollow slab system is not increased with an incremental increase in its thickness, and that the flexural stiffness of a biaxial hollow slab is not significantly lower than that of a general solid slab, there has been a growing need for biaxial hollow slab systems, because long span structures are in great demand. In a long span structure, the problem of vibration of floor slabs frequently occurs, and the dynamic characteristics of a biaxial hollow slab system are quite different from the conventional floor systems. Therefore, in this study, the floor vibration of a biaxial hollow slab system subjected to walking load is investigated in comparison with a conventional floor slab system. For the efficiency of time history analysis, an equivalent plate slab model that can precisely represent the dynamic behavior of a biaxial hollow slab system is used. From the analytical results, it was determined that vibration of a biaxial hollow slab system subjected to walking load is evaluated as "office-level vibration," according to the classifications of the architectural institute of Japan and ANSI.