• Title/Summary/Keyword: Construction Condition

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Estimation of Non Working Day Corresponding to Statistical Data of Korea Meteorological Administration - Focused on Cheonju - (기상청 통계자료기반 기후요소에 의한 작업불능일 산정 - 청주지역을 중심으로 -)

  • Baek, Dae-Hyun;Joung, Woung-Sun;Park, In-Beom;Song, Seung-Heon;Baek, Byung-Hoon;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2008.05a
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    • pp.141-145
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    • 2008
  • In this paper, non working day for the construction project in Cheongju region considering weather condition for 30 years from 1971 to 2000 and 10 years from 1991 to 2000 as statistical periods was estimated. In Cheongju region, there was no remarkable difference between them because non working day for outside and half outside work was 157days and for interior work 144days at statistics for 30 years., and utside and half outside work was 159days and for interior work 142days at statistics for 10 years.. However, non working day due to high temperature is slightly increased, and non working day due to cold weather is slightly decreased in the case that the recent statistical data was used caused by global warming. Non working day due to rainfall was 23 days at statistics for 30 years, and it was 28 days at statistics for 10 years.

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BIM and Thermographic Sensing: Reflecting the As-is Building Condition in Energy Analysis

  • Ham, Youngjib;Golparvar-Fard, Mani
    • Journal of Construction Engineering and Project Management
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    • v.5 no.4
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    • pp.16-22
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    • 2015
  • This paper presents an automated computer vision-based system to update BIM data by leveraging multi-modal visual data collected from existing buildings under inspection. Currently, visual inspections are conducted for building envelopes or mechanical systems, and auditors analyze energy-related contextual information to examine if their performance is maintained as expected by the design. By translating 3D surface thermal profiles into energy performance metrics such as actual R-values at point-level and by mapping such properties to the associated BIM elements using XML Document Object Model (DOM), the proposed method shortens the energy performance modeling gap between the architectural information in the as-designed BIM and the as-is building condition, which improve the reliability of building energy analysis. Several case studies were conducted to experimentally evaluate their impact on BIM-based energy analysis to calculate energy load. The experimental results on existing buildings show that (1) the point-level thermography-based thermal resistance measurement can be automatically matched with the associated BIM elements; and (2) their corresponding thermal properties are automatically updated in gbXML schema. This paper provides practitioners with insight to uncover the fundamentals of how multi-modal visual data can be used to improve the accuracy of building energy modeling for retrofit analysis. Open research challenges and lessons learned from real-world case studies are discussed in detail.

A Study on Thermal Cutting using Hydrogen-Oxygen Mixed Gas (수소-산소 혼합가스를 이용한 열절단 특성)

  • Kim, Nam-In;Jang, Yong-Won;Lee, Jeong-Soo
    • Special Issue of the Society of Naval Architects of Korea
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    • 2008.09a
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    • pp.126-132
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    • 2008
  • Cutting procedures whose qualifies are determined by various variables largely influences shipbuilding productivity. Particularly, defects in cutting shapes and cutting surface results in delay of the post shipbuilding stages such as welding and assemblage process. Because cutting procedures are influenced by various numbers of requirements according to the plate thickness, cutting precision can be maintained when the cutting conditions are appropriate. Existing cutting procedures utilize fossil fuels such as propane or ethylene as the main fuel component. Especially, when fossil fuel is applied to thick plate cutting, this process gives relatively slow cutting speed and generates large quantities of harmful polluting fumes. Recently, hydrogen-oxygen mixed gas generated by electrically dissociating water into Hydrogen and oxygen components is welcomed as an alternative fuel source. Also recent results report that alternative cutting fuel improves the cutting Dualities and speed. This paper presents that cutting characteristics and optimum cutting condition of hydrogen-oxygen mixed gas.

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Analysis of Relationship between Fatal Accidents Causes and Consciousness of Scapegoatism in Construction Site (건설현장 사망사고 발생원인과 책임전가의식 간의 관계 분석)

  • Oh, Gyu-Sun;Cha, Yongwoon;Hyun, Chang-Tack
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.192-193
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    • 2015
  • The number of accidents is raising every year and severity is also increasing. A lot of studies are interested in the leading indicator such as safety culture or safety audit to reduce accidents. In particular, the studies on safety awareness are actively conducted. However, these studies showed that there was consciousness of scapegoatism which to pass responsibility of accident causes to others regardless of safety awareness. It means that there are probability about overestimating and making light of unsafe condition and act which have to manage and control. Eventually, the direct causes which lead to the fatal accident may be consistently arisen. Nevertheless, researches about consciousness of scapegoatism are shortage. Therefore, this study proposed the means to investigate the relationship between consciousness of scapegoatism and accidents through report from KOSHA and conducts the survey with suggested means. This paper will contribute to prevent accidents by identifying relationship between consciousness of scapegoatism and accidents.

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Long Term Deflection of Flat Plate Affected by Construction Load (시공하중의 영향을 받는 플랫플레이트의 장기처짐)

  • Kang, Su-Min;Lee, Ji-Woong;Oh, Jea-Geun;Kim, Ook-Jong;Lee, Do-Bum;Park, Hong-Gun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.149-152
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    • 2006
  • Serviceability of reinforced concrete building is affected dominantly by long term deflection of slab. And in case of reinforced concrete building with flat plate slab, severe long term deflection was expected because it has no beams which have large flexural stiffness. Therefore it is important to calculate exactly long term deflection of RC flat plate structure to assure its serviceability. However, current codes couldn't calculate exactly long term deflection of RC flat plate structure because they don't consider effects of boundary condition and construction load. By the way, recently the method to calculate long term deflection of RC flat plate structure was proposed by considering these effects. In the present study, long term deflection of RC flat plate structure was analyzed by comparing this method with recent experimental results. In conclusion, long term deflection of RC flat plate structure was affected considerably by effects of boundary condition, construction load and tensile strength of concrete. And recently proposed method considers these effects reasonably but it should be modified to reflect creep effect of RC flat plate slab reasonably.

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A Study on the Field Application Analysis for High Adhesive Spray Type of Degenerated and Rubberized Asphalt Membrane Material (스프레이식 고점착 변성 고무 아스팔트 도막 방수재의 현장 적용성 평가에 관한 실험적 연구)

  • Oh, Sang-Keun;Kwak, Kyu-Sung;Choi, Sung-Min;Song, Je-Young
    • Journal of the Korea Institute of Building Construction
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    • v.6 no.4 s.22
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    • pp.85-92
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    • 2006
  • Urethane, epoxy, acrylic have common property to adhere on the concrete dried surface in the waterproofing materials at present. In the wet condition, however, the materials such as urethane, epoxy, acrylic need a long hardening time and it become a reason of water leakage as the materials breaking down. it is one of the problem to adhere to the substrate. Therefore, in this thesis, I focused to assure the structural safety and durability and quality for waterproofing and safe of construction cost by cut down the cost of labor and reduce the term of works as searching the application of field condition for high adhesive spray type of degenerated and rubberized asphalt membrane material.

Analysis of Mobile Lead in Soil Using Carboxylated Magnetic Particle

  • So, Hyung-Suk;Shin, Hyun-Chul;Yoo, Yeong-Seok;Schaeffer Andreas
    • Journal of Magnetics
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    • v.10 no.3
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    • pp.89-92
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    • 2005
  • The analytic possibility of mobile lead contained in soil has been studied using carboxylated magnetic beads. Extraction of heavy metal was performed to contaminated soil that has been collected and supplied for tests. As experiment materials, soil sample, distilled water and magnetic beads were only used. It means that the lead was extracted under neutral condition. In this condition, only the mobile fraction of lead could be extracted by magnetic beads. The mobile lead in the soil was quickly combined with magnetic beads in the mixture process. Then, the magnetic beads were dissolved into acids after collection by external magnetic force, and the lead combined with the beads was eluted and analyzed by Graphite Furnace Atomic Absorption Spectroscopy (GFAAS). In the results of extraction experiments for 3 sandy soils, the efficiency using beads was similar to or higher than that of EDTA (Ethylendiamintetraacetic acid), which is normally used for analyzing mobile heavy metal concentration in soil. With this, it was shown that this method is a more accurate and simple method to analyze mobile lead when analyzing mobile heavy metal concentration in sandy soil, rather than conventional method using EDTA.

The strength characteristic of extruding solid according to substitution ratio and curing methods of waste concrete powder (폐콘크리트 미분말 대체율 및 양생방법에 따른 압출경화체의 강도특성)

  • Yu, Jae-Seong;Kim, Jin-Man;Lee, Myeong-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.49-50
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    • 2015
  • Recently, by-products from concrete industry are generated in large quantities because of urban redevelopment. Accordingly, waste concrete powder(WCP) inevitably generated in the course of crushing, screening, and separating the waste concrete also show high emission and be increasing gradually, but which is mostly buried with waste concrete aggregate. This is a basic research to increase the value added utilization rate of WCP. We have examined strength characteristic of extruding panel with WCP, depending on the curing methods. The result of study shows similar strength to the base specimen in autoclave curing condition. And in autoclave curing condition, the specimen with WCP of 20% and 30% satisfy the target strength of 14MPa.

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Spalling of Concrete with Compressive strength and heating rates (압축강도 및 가열속도에 따른 콘크리트의 폭렬성상)

  • Choe, Gyeong-Choel;Kim, Gyu-Yong;Yoon, Min-Ho;Lee, Young-Wook;Hwang, Ui-Chul;Yoo, Jae-Chul
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.43-44
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    • 2015
  • In this study, spalling property were evaluated from concrete with compressive strengths of 30MPa, 90MPa, 180MPa, applied with fast heating condition(ISO-834 standard heating curve) and slow heatign condition(1℃/min). As a result, the spalling property of concrete was shown differently with compressive and heatign rate. And It could be separated three as non spalling, surface spalling and explosive spalling.

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Experimental Study for the Factors Influenced on the Permeability of Concrete (콘크리트의 누설성에 미치는 영향 요인에 관한 실험적 연구)

  • 김진근;이성태;양은익;김민욱;이성규;최강룡
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04b
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    • pp.725-730
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    • 1998
  • In the nuclear power plant, steel or polymer liner plates are adopted to prohibit inner concrete surface contacting with gas or liquid materials. If there is an accident, the plate will be damaged, and concrete shall have final responsibility to safety requirements. In this paper, an experimental research was carried out to investigate the effects of construction joint and wet and loading condition on the permeability of concrete. The test results showed that leakage rate is decreased much more at the following cases than the others : (a)wet condition, (b)without a construction joint case, and (c)case subjected to external loads. It was noted that more reinforcement is required at the latter case.

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