• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.3
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• pp.68-76
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• 2021

Storage racks have suffered huge losses due to earthquakes, but related research and regulations are relatively insufficient non-structural elements compared to the structural elements. In this study, we tried to experimentally analyze the behavioral characteristics of storage racks due to external force according to the fixing conditions of the column-foundations connection of storage racks. In general, the column-foundations connection of storage racks is installed according to the user's convenience without installation standards and regulations. For this reason, this study conducted a behavior analysis test on four full-scale storage racks with the condition of column-foundations connection of four typical storage racks. The behavior characteristics analysis test was performed by two-direction of the shake table with El-Centro seismic wave. To confirm the behavior characteristics according to the magnitude of the seismic load, 50% ~ 150% of the seismic waves were increased by 50% for each test. In addition, a resonance search test was conducted to confirm the natural frequency of each storage racks foundations fixing condition. Among the data obtained through the test, the displacement of the top layer and the permanent displacement after the test were compared for each condition to analyze the behavior characteristics of the column-foundations fixed conditions of the storage racks. As a result, the change of natural frequency was small in storage racks due to the change of the conditions of the foundations, and the behavior characteristics were changed due to the difference of the restoring force due to the change of the storage racks foundations condition rather than the influence of the natural frequency of the input load.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.2
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• pp.349-356
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• 2018

This paper attempts to develop a connection model based on FE analysis that can be applied to the evaluation of earthquake fragility of Steel Storage Racks lacking research in Korea. In order to accomplish this goal, shaking table tests, modal tests, and various member tests (8 case, push-over test) for structural members have been conducted to understand the behavior of steel storage racks. Based on the experimental results, detailed modeling of the joints was conducted using the NX-Nastran program in order to develop a connection model for Steel storage racks to be applied to the seismic vulnerability assessment. Especially, surface to surface contact element and spring element are applied to simulate the connection between the column member and the beam member connected by the simple latch method. Spring element model developed and applied ARX (Auto Regressive eXogenous) based mathematical model. The simulation results based on the FE model showed excellent reliability with a mutual error rate of less than 8% when compared with the member test results. As a result, it was confirmed that the FE model based connection model developed in the study can be applied to the analytical model for the seismic vulnerability assessment of Steel storage racks.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.28 no.1
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• pp.25-30
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• 1999

최근 고도의 경제성장과 함께 유통구조의 선진화로 대형화, 하역 및 적재, 운반기계의 자동화를 도입하므로써 생산 또는 보관제품의 품질 보존, 작업 인원의 최소화 및 교통체중에 대한 적절한 대응으로 고품격의 물류 서비스를 할 수 있게 되었다. 특히, 생산 또는 보관제품의 품질 보존을 위해서는 물류 창고 내의 물류 특성에 따른 실내 공조환경 즉, 적정한 온 습도 및 기류를 유지하도록 공조설비를 계획하여야 하는데 층고가 높고 바닥면적이 넓은 대형 물류센터 즉, 산업용 대공간에 대한 공조설비는 층고 높이로 적재된 장애물을 극복하고 취출되는 기류가 실내 전체에 골고루 확산 및 순환 될 수 있도록 적정한 공조방식을 선정하여야 한다. 따라서 본 계획에서는 주로 N-스포츠사의 이천 물류센터 공조방식의 설계 사례를 들어 산업용 대공간에 대한 공조계획 개선 방안을 소개 하고자 한다.

• Fire Science and Engineering
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• v.30 no.3
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• pp.23-30
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• 2016

A fire extinguishing system for a rack warehouse was recently designed, which only consider the gross area and number of stories. However, the design of such a system should take into account not only the planar structuree, but also the elevation perspectives due to its vertical structure. Moreover, the fire load of the commodities palletized on the racks should be considered, in order to design a performance-based fire safety system that is appropriate for these environmental conditions. For this reason, this study analyzed the fire characteristics of the commodities palletized on the racks (pallet + the commodities in a box unit + vinyl packing material), taking into consideration the results of a field investigation conducted in Korea, as well as the Hazard Classifications of Commodities used in other countries. Through this analysis, the heat release rate (HRR) and smoke production rate (SPR) were derived.

• 월간 기계설비
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• s.235
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• pp.57-65
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• 2010

송도 신도시는 도시 전체를 '친환경 개발'로 기획함에 따라 쾌적한 주거환경 조성 및 편의성 제공을 위해 쓰레기관로수송 설비가 도입되었다. 쓰레기관로수송 설비는 투입구에 버려진 쓰레기를 중앙 집중제어 시스템에 의해, 아파트 입상 지하횡주관을 통해 중앙집하장으로 운반, 컨테이너에 자동적재 후 최종처리 됨으로써 위생적이고 쾌적한 주거환경을 구현하는 친환경적 설비 시스템이다. 쓰레기관로수송 설비는 과천시와 광명시도 의무화하여 시행중에 있으며, 송도 신도시 등의 성공적인 시공에 힘입어 인천광역시, 대구광역시, 파주시 등의 지방자치단체 및 구청에서도 폐기물 수집 운반 처리 방법의 개선을 위해 설치 의무화에 관한 행정 조례를 제정 추진 중에 있다.

• Magazine of the Korea Concrete Institute
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• v.14 no.4
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• pp.33-39
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• 2002

레미콘의 품질성능을 좌우하는 것은 콘크리트 사용재료 및 배합뿐만 아니라 레미콘을 제조하는 믹서 및 이를 현장까지 운반하는 트럭 에지테이터의 품질성능에 크게 좌우된다. 그러나, 레미콘 공장의 혼합 설비인 믹서 및 트럭 에지테이터에 관한 국내 자료는 거의 전무한 실정이며 이에 관한 연구도 상대적으로 매우 부족하다. 특히, 최근에는 고강도 콘크리트, 고유동 콘크리트, 고강도 경량 콘크리트, 수중불분리 콘크리트, 섬유보강 콘크리트 등 고성능 콘크리트 성능에 대한 요구가 날로 증가하는 추세이며 이에 따라 레미콘 공장에서도 혼합설비 및 운반설비가 고성능화 되어 가는 추세이다.(중략)

• Fire Science and Engineering
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• v.30 no.6
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• pp.84-91
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• 2016

In case of fire, vertically and intensively loaded rack warehouses are faced with a severe status due to the rapid increase in fires. In this regard, there have been trials to prevent fires from spreading by applying fire extinguishing systems, such as ESFR and In-Rack Sprinklers, vertical and horizontal barriers, etc.; however, it is difficult to calculate and design proper fire extinguishing systems caused by various composition conditions, such as the size and loading density of the rack, types of loading commodities, etc. Therefore, in this study, a standard rack was manufactured, incorporating a rack warehouse in Korea by site investigations, surveys, etc. In addition, a full scale fire test was executed to check the fire characteristics depending on the conditions of the ignition points. As a result, the extracted fire spread speed is expected to be utilized as a reference for performance comparisons of the fire extinguishing systems to be developed and applied in the future.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.2
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• pp.157-164
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• 2023

This study aims to analyze the damage and destruction behavior of pallet racks due to external forces through shaking table test. Pallet racks is a general storage racks type consisting of column, beam, and brace to resist an external force. To analyze the safety of the pallet racks due to external force, a shaking table test was conducted to investigate the pallet racks behavior due to external force while increasing the seismic load targeting the pallet racks used in the existing logistics storage facility. As a result of the shaking table test, it was confirmed that the torsion of the pallet racks damaged the connection parts of some members located on the 1st and 2nd levels, thereby destroying the loading equipment.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2008.11a
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• pp.373-374
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• 2008

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2010.10a
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• pp.359-360
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• 2010