• Title/Summary/Keyword: Rahmen structure

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Preliminary study on the Review Project Viability to Rahmen Structure (라멘조 공법의 사업성 검토에 관한 기초연구)

  • Lee, Sung-Ho;Joo, Jin-Kyu;Lee, Goon-Jae;Kim, Sun-Kuk
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.139-140
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    • 2011
  • The government encourages adoption of Rahmen structure design to ensure efficient management of national resources. However, in comparison with bearing-wall structure, Rahmen structure requires higher unit construction cost and present challenges in terms of securing adequate floor area ratio and floor height. That is why project clients have been disinterested in adoption of Rahmen structure design. Therefore, we have attempted to find factors having influence on decline of project viability for Rahmen structure. This study will be utilized as a basic reference study for promotion of Green Frame design which is a composite PC structure already developed.

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Noise and Vibration Characteristics of Construction structures in Standard Laboratory (표준실험동의 구조별 소음 진동 특성)

  • Jeong, Young;Yoo, Seung-Yub;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.390-393
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    • 2005
  • In this study, examined heavy-weight floor impact sound to rahmen structure(steel reinforced concrete structure) and bearing-wall structure(box frame type structure) that have slab thickness of 4 form at a standard laboratory through noise and vibration measured. The results of ANSYS modeling of structures was predicted that the nature natural frequency increased according to change of thickness of each slab by finite element analysis, and acceleration value decreased. Rahmen structures compares with bearing-wall structure, nature frequency was predicted low. Measurement results of natural frequency and acceleration level for structures at a standard laboratory, tendency department such as ANSYS modeling appeared. Rahmen structures appeared that reduction effect is less in Acceleration level and heavy impact sound transmission level comparing with bearing-wall structure.

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Investigation of Floor Impact Sound Levels in Rahmen Structure Multi-story Residential Buildings (라멘복합구조 공동주택의 바닥충격음 실태)

  • 정정호;송희수;전진용
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.308-311
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    • 2004
  • It is reported that there is a limit in increasing heavy-weight impact noise isolation performance of the load bearing wall system apartments to meet the regulation of the Ministry of Construction and Transportation (MOCT). To increase the heavy-weight impact noise isolation performance, improvement in structural systems such as increasing concrete slab thickness and application of rahmen structure were proposed. In this study floor impact sound levels from toil apartments with two rahmen structure multi-story residential buildings were measured before the construction of the buildings finished. Measurements were made at living room and two bedrooms at each apartment when the finishing processes were finished. The average value of light-weight impact sound level from ten apartments was 56dB (L'$\sub$n,Aw/). The heavy-weight impact sound level was 44dB (L'$\sub$i.Fmax.Aw/) and the impact sound level of the impact ball was 41dB(L'$\sub$i.Fmax.Aw/), As a result floor impact noises at the rahmen structure system were lower than the regulation level.

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An Experimental Study on the Reduction of Floor Impact Sound in Apartment Houses by using Model Test (모델 실험체를 이용한 공동주택 바닥충격음 저감에 관한 실험적 연구)

  • Kim, Hang;Gi, No-Gab;Park, Hyeon-Ku;Song, Min-Jeong;Kim, Sun-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.1044-1047
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    • 2004
  • This aim of this study is is an experimental study to introduce the Reduction method of Floor Impact Sound in Apartment Houses by using Model Test, We are measured the floor impact sound in Rahamen and Apartment with Shear Wall and Post-tensioning. There is comparison between Rahmen Structure and Apartment with Shear Wall. The main results from this study are effective in reduction of heavt-weight The slab was constructed by rahamen structure. Heavy-weight can reduced by upgrading naturial frequency of floor impact sound in rahmen structure.

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Equivalent Distributed Loads of HL Loading for Design of the Rahmen Bridges (라멘교 설계를 위한 HL 열차하중의 등치분포하중)

  • 진치섭;한상중;이홍주;김희성;조상제
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.04a
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    • pp.207-212
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    • 1993
  • Rail carrying structures in international routes as well as domestic ones shall be designed to carry HL(High Speed Railway live Load) loads, The loads shall be placed in the most unfavourable position for the part of the structure in question. In general, influence lines may be used to determine the maximum bending moments and maximum shear forces in the reinforced concrete rahmen bridge structures. In this study, based on the finite element analysis, equivalent distributed loads of HL loading for design of the rahmen bridges are deterimined.

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Submerged Membrane Breakwaters I: A Rahmen Type System Composed of Horizontal and Vertical Membranes

  • Kee, Sung-Tae
    • International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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    • v.5 no.1
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    • pp.14-21
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    • 2002
  • In the present paper, the hydrodynamic properties of a Rahmen-type, flexible, porous breakwater interacting with obliquely or normal- incident small amplitude waves are numerically investigated. This system is composed of dual vertical porous membranes, hinged at the side edges of a submerged horizontal membrane. The dual vertical membranes are extended downward and hinged at seabed. The effects of permeability, Rahmen-type membrane breakwater geometry, pre-tensions on membranes, relative dimensionless wave number, and incident wave headings are thoroughly examined.

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Performance Analysis of SMART Frame Applied to RC Column-Beam Structures (RC 라멘조에 SMART Frame 적용 시 효용성 분석)

  • Cho, Wonhyun;Lim, Chaeyeon;Jang, Duk Bea;Kim, Sunkuk
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.168-169
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    • 2015
  • SMART Frame is a composite precast concrete structure system to deliver the advantages of both steel frame and reinforced concrete. Many studies have established to date that SMART Frame is more advantageous than conventional frame-type structure in terms of structural stability, constructability, economic viability as well as reduction of construction schedule. However, such studies have focused primarily on wall-type or flat slab-type apartment housing structures, failing to include Rahmen structures in their scope. Accordingly, this study aims to analyze the benefits of potential application of SMART Frame to RC Rahmen structures. As the structural stability and constructability of SMART Frame is already proven, this study reviews its benefits from the perspective of cost reduction. Conclusion of this study will be used subsequently in predicting the benefits of SMART Frame when it is adapted to RC Rahmen structures.

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Development of Beam-Column Connection for The New Apartment Structural System (장수명 공동주택용 보-기둥 접합부 시공방법 개발)

  • Yoon, Tae-Ho;Hong, Won-Kee;Kim, Sun-Kuk;Park, Seon-Chee;Yun, Dai-Young
    • KIEAE Journal
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    • v.10 no.6
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    • pp.145-151
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    • 2010
  • Bearing wall system was used extensively in most multi-residential apartment buildings in Korea. However, bearing wall apartments have the lack of architectural plan flexibility, remodelling-incompatible, causing serious economic losses in terms of construction waste. Recently, many researchers have studied the use of Rahmen structure as a potential alternative. The beam-column connection in the paper for long-life apartment housing forms connection of a Rahmen structure utilizing the advantages of steel and reinforced concrete. In addition, reduction of cast-in place concrete and construction schedule is expected by using precast concrete. Reduction effect of quantity decreased construction costs and $CO_2$ emission of key construction materials. However, verifying the feasibility of new construction method entails numerous challenges. Accordingly, the purpose of this study is to analyze the construction feasibility of sleeve, coupler, and pressure welding connections for long-life apartment building structure. A 3D modeling software was used to perform the analysis, and a real scale model was created to verify the results of construction feasibility. By verifying the construction feasibility of beam-column connections, this study will contribute to the efficient application of these methods on construction sites.

A Study on the Structural Behavior in Mass Concrete Box Rahmen due to Hydration Heat (수화열에 의한 매스콘크리트 박스 라멘 구조물의 구조거동 연구)

  • 조병완;김영진;허민희
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.349-352
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    • 1999
  • Concrete cracks due to hydration heat are a serious problem, particularly in mass concrete structures such as box rahmen, dam or footing of pier, etc.. As a result of the temperature rise and restriction condition of foundation, the thermal stress which may induce the cracks can occur. In this, study, ABAQUS program package was used to calculate the temperature distributions generated by hydration heat and the thermal stress in box rahmen structure which have thickness of 1.7~2.2m, and applied for various equations of adiabatic temperature rise such as korean code, japanese code, convection coefficient and low heat cement code.

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Submerged Membrane Breakwaters I: A Rahmen Type System Composed of Horizontal and Vertical Membranes (수중 유연막 방파제 I : 수평-수직 유연막으로 구성된 라멘형 시스템)

  • 기성태
    • Journal of Ocean Engineering and Technology
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    • v.16 no.5
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    • pp.7-14
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    • 2002
  • in the present paper, the hydrodynamics properties of a Rahmen type flexible porous breakwater interacting with obliquely or normally incident small amplitude waves are numerically investigated. This system is composed of dual vertical porous membranes hinged at th side edges of a submerged horizontal membrane. The dual vertical membranes are extended downward and hinged at seabed. The effects of permeability, Rahmen type membrane breakwater geometry pre-tensions on membranes, relative dimensionless wave number, and incident Wave headings are thoroughly examined.