• Title/Summary/Keyword: Roof membrane

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A Study on Selection of Roof Waterproofing Method by analyzing Life Cycle Costing (LCC 평가를 통한 지붕방수공법선정에 관한 연구)

  • Choi, Oh-Young;Kim, Tae-Hui;Kim, Gwang-Hee
    • Journal of the Korea Institute of Building Construction
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    • v.8 no.5
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    • pp.127-134
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    • 2008

  • The purpose of this study is to propose the decision making technique in roof waterproofing method at the early construction stage. Selecting the suitable construction method is difficult because of the complex interrelationships between many factors of influencing the construction method selection. This study presents an example of selecting suitable method by analyzing LCC (Life Cycle Cost) in roof waterproofing work. In this study, roof waterproofing method is analyzed by LCC(Life Cycle Cost) which is consists of the initial costs, running costs, and removal costs. Sheet waterproofing, membrane waterproofing and asphalt waterproofing costs are compared to select the most economic method. The result of this study revealed that considering LCC is useful in selecting the proper method in the construction work.

  • https://doi.org/10.5345/JKIC.2008.8.5.127 인용 PDF KSCI

A Experimental Study on Effluence Characteristic of the Rainfall in the IRMA Green Roof System of KICT (역지붕 녹화옥상시스템[KICT-GRS2004]의 우수유출 특성에 관한 실험적 연구)

  • Jang, Dae-hee;Kim, Hyeon-soo;Lee, Keon-ho;Moon, Soo-young
    • KIEAE Journal
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    • v.5 no.2
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    • pp.11-18
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    • 2005

  • The Purpose of this study is development and analysis of Effluence Characteristic of the Rainfall in the IRMA Green Roof System(developed in KICT) Plus 50 program is an internal research project at KICT(Korean Institute of Construction Technology) which has it as an object ; to lengthen the building's life 50-year or more and reduce energy conception 50% than present. Green roof system is one of the most important theme in the Plus 50 program. Generally, a Green Roof System has a positive effect on the thermal conductivity in winter, the micro cooling effect on building and city by evaporation in summer, the flood-control effect by runoff-reduction or the treated rainwater-quality of green roof system and so on. However, inspection of the physical effect of green roof system does not consider in Korea. Above all, long-term monitoring and a whole observation of green roof system is needed to probate the effect. So a new experimental method could be tried in this research, which is never attempted in Korea. The measurement by a bucket with a great volume, 1L, gives a new dimension of measuring green roof effect to measure the permanent running flood from a wide roof. This offers a reasonable result on a long-term measuring of a running water. Additionally, the thermal behavior of the IRMA(Insulated Roof Membrane Assembly), known in the western europe as a reasonable solution at green roof system by economical benefits and easy construction, would be experimented.

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A Study on the Nonlinear Structural Analysis of Barrel Vault-Typed Membrane Roof Structures Considering the Orthotropic Material (직교이방성을 고려한 Barrel Vault형 지붕 막구조물의 비선형 구조해석에 관한 연구)

  • Kim, Seung-Deog;Jeong, Eul-Seok;Baek, In-Seong
    • Journal of Korean Association for Spatial Structures
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    • v.5 no.1 s.15
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    • pp.91-98
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    • 2005

  • Membrane structures, a kind of lightweight soft structural system, are used for spatial structures. The material property of the membrane has strong axial stiffness, but little bending stiffness. Therefore membrane structures are unstable structures initially. These soft structures need to be introduced initial stresses first because of its initial unstable state, and it happens large deformation phenomenon. To find the structural shape after large deformation caused by initial stiffness introduced, we need the shape analysis considering geometric nonlinearity in structural design procedure In this study, we analyze the soft spatial structures by the NASS which is the program for nonlinear analysis. The analytic model is a roof membrane structures of Barrel Vault-Type. We have done the shape analysis and the stress-deformation analysis considering the orthotropic material, and then study the safety.

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Comparison of Wind Pressure Coefficient and Wind Load Standard for Cladding in a Retractable Dome Roof by Wind Tunnel Test (풍동 실험을 통한 개폐식 돔 지붕의 외장재용 풍압 계수와 풍하중 기준 비교)

  • Cheon, Dong-jin;Kim, Yong-Chul;Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
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    • v.18 no.3
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    • pp.125-132
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    • 2018

  • The biggest impact on the cladding design of buildings is wind loads. Wind tunnel tests were conducted to examine the applicability of current wind load standards about membrane retractable roof spatial structure. A dome model with a circular shape that is retractable to the center of the dome was made (Opening ratio = 0, 10, 30, 50). In addition, height adjustable turntables were made and tested with five patterns with H/D = 0.1, 0.2, 0.3, 0.4 and 0.5. The maximum wind pressure coefficient and the minimum wind pressure coefficient for the cladding were analyzed and the experimental wind pressure coefficient were compared with the current wind load standards, KBC2016 and AIJ-RLB(2015). The experimental value and the reference value of the enclosed roof were very similar and showed possibility of application, but opened roof case was found that the reference value was underestimated.

  • https://doi.org/10.9712/KASS.2018.18.3.125 인용 PDF KSCI