• Title/Summary/Keyword: building passage

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A study on the finish work of Reinforced Con'c slab for improving workability in the column shortening compensation. (기둥축소량 보정법에 있어서 시공성 향상을 위한 RC 슬래브 표면마무리에 관한 연구)

  • 소광호;이재옥;양극영
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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    • pp.147-152
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    • 2003
  • Passage of time axial shortening in the cores and columns of tall concrete buildings requires special attention to ensure proper behavior for strength of the structure and the nonstructural element. The effects of column shortening, both elastic and inelastic, take on added significance and need special consideration in design and construction with increased height of structures. In this paper, the compensation method of column shortening for reinforced concrete structure are introduced. It could be concluded that the survey is a significant factor for the compensation instance of column shortening.

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A Study of Applications of DSM in tunnelling to an underground shopping-area (도심지 지하상가 연결통로 DSM(Divided Shield Method)공법 적용사례 연구)

  • Hong, Chang-Soo;Hwang, Dae-Jin;Lee, Kang-Ho;Cho, Keum-Sik
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.10a
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    • pp.556-563
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    • 2005
  • Recently, it is used to join an building to an underground shopping-area in urban. When we construct Seo-Cho Complex building which is in Seoul, we also construct an underground passage to the Gangnam underground shopping-area. But it is difficult to excavate in the downtown area, because excavations induce traffic jam and public discontent. Considering safety, a confined area, settlements, we decided to use DSM(Divided Shield Method) which is based on messer shield. This paper will produce our experience and the results provide a useful guide in a connection tunnel

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Windborne debris risk analysis - Part I. Introduction and methodology

  • Lin, Ning;Vanmarcke, Erik
    • Wind and Structures
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    • v.13 no.2
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    • pp.191-206
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    • 2010
  • Windborne debris is a major cause of structural damage during severe windstorms and hurricanes owing to its direct impact on building envelopes as well as to the 'chain reaction' failure mechanism it induces by interacting with wind pressure damage. Estimation of debris risk is an important component in evaluating wind damage risk to residential developments. A debris risk model developed by the authors enables one to analytically aggregate damage threats to a building from different types of debris originating from neighboring buildings. This model is extended herein to a general debris risk analysis methodology that is then incorporated into a vulnerability model accounting for the temporal evolution of the interaction between pressure damage and debris damage during storm passage. The current paper (Part I) introduces the debris risk analysis methodology, establishing the mathematical modeling framework. Stochastic models are proposed to estimate the probability distributions of debris trajectory parameters used in the method. It is shown that model statistics can be estimated from available information from wind-tunnel experiments and post-damage surveys. The incorporation of the methodology into vulnerability modeling is described in Part II.

Validation and Development of Artificial Sky Dome Facilities with a Heliodon (인공 천공돔과 헬리오돈의 개발 및 성능실험 사례 연구)

  • Kim, Jeong-Tai;Kim, Gon
    • KIEAE Journal
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    • v.3 no.1
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    • pp.21-29
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    • 2003
  • Scale model measurements should be conducted under an actual sky or in a simulated sky where conditions can be held constant. A number of successful attempts have been made to develop artificial sky domes with man-made sun emulators. With reference to formerly-developed examples, sky simulator facility has recently been activated in oder to provide desirable sky conditions for teaching and studies. The structure is a 6m-diameter dome and promises to set various condition for energy related and lighting research activities. The sky dome is also equipped a heliodon, the tilt table, to facilitate additive direct sun impact under clear skies. Shading studies, using scale models with the heliodon, reveal how a building's design blocks or permits light's passage to the interior; solar access studies, and tests of the reflection and transmittance characteristics of new daylighting technologies. The design and construction specification and the initial operating experience with a building configuration are reported.

Evaluation on Water Vapor Pressure of Amorphous Steel Fiber reinforced High Strength Concrete (비정질 강섬유 혼입 고강도콘크리트의 수증기압력 평가)

  • Kim, Duck-Woo;Kim, Gyu-Yong;Hwang, Eui-Chul;Son, Min-Jae;Baek, Jae-Wook;Nam, Jeong-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.44-45
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    • 2018
  • In this study, water vapor pressure of high strength concrete reinforced with amorphous steel fiber(AF) was evaluated. Experimental results show that spalling occurs when the incorporation rate of amorphous steel fiber is 0.5 vol.% or more. This is because the ratio of AF increased per unit area influenced the formation of the water vapor pressure discharge passage by the polypropylene fiber(PPF) melting. Therefore, it is necessary to find the proper mixing ratio of AF and PPF to prevent spalling.

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Properties of Mortar Using Lightweight Fine Aggregate Made by Bottom Ash Discharged Air Cooling Process according to Grading (건식공정 바텀애시 경량 잔골재의 입도 조건에 따른 모르타르의 특성)

  • Choi, Hong-Beom;Sun, Joung-Soo;Yu, Jae-Seong;Li, Mao;Choi, Duck-Jin;Kim, Jin-Man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.11a
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    • pp.53-54
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    • 2014
  • This study evaluates engineering properties of mortar using lightweight fine aggregate made by bottom ash discharged air cooling process according to grading. Then we confirm possibility of use as lightweight fine aggregate. Consequently, Mix using bottom ash need additional examination for a change with the passage of time of flow. Also, mix of S indicates similar compressive strength with mix of Plain and 16% decrease of unit weight compared to mix of Plain; while mix of B indicates 10% decrease of compressive strength and 16% decrease of unit weight. Therefore, this study shows that mix of S and B is superior compared with other mix.

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A Study on the Current Status and Analysis on the Problem of Unfloored space and Floor Repair in Rural House (농촌주택의 봉당·마루 개보수 현황 및 문제점 분석)

  • Park, Gil-Beom;Park, Jun-Mo;Kim, Ok-Kyue
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.11a
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    • pp.117-118
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    • 2014
  • The unfloored space and floor is one of characteristic of traditional house in Korea. This space is used to connecting passage between room or entrance of house. Currently, according to decline of heat insulation property thereby becoming decrepit house, native is repairing it for block external environment such as rain, wind and so on. But, variety problem is happening from wrong repair. This object of this study is current status and analysis on problem of unfloored space and floor repair. As a result, current status of repair is classified repair type, installation position and using form. And position of problem is confirmed connection between original house and extend space.

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A Study on the Functional Unit Trend of Carbon Dioxide Emission in the Construction Materials between 2000, 2003 and 2005 (건축재료의 이산화탄소 배출원단위 변화추이연구)

  • Lee, KangHee;Lee, HaShik;Yang, JaeHyuk
    • KIEAE Journal
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    • v.10 no.5
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    • pp.123-129
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    • 2010
  • This study aimed at analyzing the trend of carbon dioxide emission for direct and indirect areas by using inter industry relations table between 2000, 2003 and 2005 in the key building materials and components. Results of this study are as follows; First, the material and components for this study was selected in 20 industries of products such as sand, gravel, cement, concrete articles, rebar, and steel bar. Second, among the 20 selected key building materials, the group with the highest carbon-dioxide emission was shown in ready-mixed concrete, concrete articles, and primary aluminum goods. Third, as a result of analyzing the changes to the units of carbon dioxide emission according to passage of time, the number of items which is changed in such as sustained increase or decrease over time was insignificant in carbon-emission change trend.

Vertical response spectra for an impact on ground surface

  • Constantopoulos, Ioannis V.;Van Wessem, Yukiko;Verbrugge, Jean-Claude
    • Earthquakes and Structures
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    • v.3 no.3_4
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    • pp.435-455
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    • 2012
  • An impact on the ground surface may represent several phenomena, such as a crash of an airplane or an explosion or the passage of a train. In order to analyze and design structures and equipment to resist such a type of shocks, the response spectra for an impact on the ground must be given. We investigated the half-space motions due to impact using the finite element method. We performed extensive parametric analyses to define a suitable finite element model and arrive at displacement time histories and response spectra at varying distances from the impact point. The principal scope of our study has been to derive response spectra which: (a) provide insight and illustrate in detail the half-space response to an impact load, (b) can be readily used for the analysis of structures resting on a ground subjected to an impact and (c) are a new family of results for the impact problem and can serve as reference for future research.

Hydroelectric Sorting Process is coal Gasification Slag Effect on the Quality of fine Aggregates (수력선별 공정이 석탄 가스화 용융 슬래그 잔골재 품질에 미치는 영향)

  • Hu, Yun-Yao;Kim, Su-Hoo;Han, Jun-Hui;Kim, Jung;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.11a
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    • pp.120-121
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    • 2021
  • This study examines the performance of the pre-treatment process system to use CGS, a by-product generated in IGCC, as a concrete fine aggregate for construction materials, on the quality of CGS fine aggregate. As a result of the analysis, it is judged that the quality of fine aggregates of CGS can be improved at both density, absorption rate, and 0.08mm body passage amount after the hydroelectric screening process using water as a medium during the pretreatment process. It is believed that it can be used as basic data for national standard certification of CGS fine aggregates in the future.

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