• Title/Summary/Keyword: wale

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Finite Element Analysis of Earth Retention System with Prestressed Wales (프리스트레스트 띠장을 적용한 흙막이 시스템의 유한요소해석)

  • Park, Jong-Sik;Kim, Sung-Kyu;Joo, Yong-Sun;Kim, Nak-Kyung
    • Journal of the Korean Geotechnical Society
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    • v.24 no.3
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    • pp.25-34
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    • 2008
  • A finite element analysis was performed for new earth retention system with prestressed wales. A 3D finite element model was adopted in this study to investigate the behavior of the earth retention system with prestressed wales. A procedure of the 3D finite element modeling of this earth retention system was presented. The procedure included the modeling of soil, wall, strut, and members of prestressed wale system which consists of wale, support leg, and steel wires, and the interface modeling of soil-wall and wall-wale. The numerical predictions of lateral wall deflection, and axial load on the members of prestressed wale systems and struts were evaluated in comparison with the measurements obtained from field instruments. A sensitivity analysis was performed using the proposed 3D finite element model to investigate the behavior of new earth retention system on a wide range of prestress load conditions of steel wires. The lateral deflection of the wall and wale, the bending moment of the wale, and the lateral earth pressure distribution on the wall were computed. Implications of the results from this study were discussed.

Analysis of Behaviors of SPS Underground Composite Frames Considering the Rigidity of RC Wale-Steel Beam Joint (RC 띠장-철골 보 접합부의 고정도에 따른 SPS 지하복합골조 거동 해석)

  • Kim, Seung-Hun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.8 no.3
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    • pp.243-250
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    • 2004
  • In SPS system, steel beams are used as not only temporary struts supporting the wale but main flexural members of building. Previous experimental works show that RC wale-steel beam joints have some flexural rigidity. In this paper, nonlinear analysis is performed using DRAIN-2DX program to investigate the behaviors of the underground composite frames constructed with SPS system when the rigidity of RC wale-steel beam joints change. Analysis variables are the procedure of construction, magnitude of lateral forces, and flexural rigidity of the RC wale-steel beam joint with stud connector. Analysis results show the effects of joint rigidity for the yielding process of frame and the moment and deflection at the mid-span of beam.

Field Application of Up-Up Construction Using Buried Wale Continuous Walt System Method (CWS공법(Buried Wale Continuous Wall System)을 적용한 Up-Up 시공사례)

  • Lee Jeong-Bae;Lim In-Sig;Kim Dong-Hyun;Oh Bo-Hwan;Ha In-Ho;Rhim Hong-Chul
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.05a
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    • pp.1-4
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    • 2006
  • A down construction method is frequently used in these days to reduce popular discontent and to assure sufficient working space at early stage in downtown area. There are two main problems in the existing down construction method. One is a confliction between frame works and excavation works, and the other is a cold joint in retaining wall which is unavoidable due to a sequence of concrete placement and induces a water leakage. Therefore, a new method is needed to overcome these problems. The CWS (buried wale Continuous Wall System) method was developed by authors. By replacing RC perimeter beam with embedded steel wale, the steel frame works of substructure can be simplified and the water leakage can be prevented using continuous retaining wall. Consequently, the improved duality and reduction of construction period can be obtained from CWS method.

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Study on Development of CWS (buried wale Continuous Wall System) Method (CWS공법(buried wale Continuous Wall System)의 개발에 관한 연구)

  • Lee Jeong-Bae;Lim In-Sig;Chun Sung-Chul;Oh Boh-Wan;Ha In-Ho;Rhim Hong-Chul
    • Journal of the Korea Institute of Building Construction
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    • v.6 no.2 s.20
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    • pp.81-89
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    • 2006
  • A down construction method is frequently used in these days to reduce popular discontent and to assure sufficient working space at early stage in downtown area. There are two main problems in the existing down construction method. One is a confliction between frame works and excavation works, and the other is a cold joint in retaining wall which is unavoidable due to a sequence of concrete placement and induces a water leakage. Therefore, a new method is needed to overcome these problems. The CWS (buried wale Continuous Wall System) method was developed by authors. By replacing RC perimeter beam with embedded steel wale, the steel frame works of substructure can be simplified and the water leakage can be prevented using continuous retaining wall. Consequently, the improved qualify and reduction of construction period can be obtained from CWS method.

IPS Earth Retention System (IPS(Innovative Prestressed Wale System) 흙막이 공법의 개발)

  • Park, Jong-Sik;Kim, Nak-Kyung;Han, Man-Yop;Kim, Jong-Woo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.293-300
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    • 2004
  • A new earth retention system(Innovative Prestressed Wale System) has been developed and introduced. IPR earth retention system provides an economical benefit, construction easiness, good performance and safety. IPS is a prestressed wale by using a steel wire, which provides a high stiffness to resist the earth pressure. In order to investigate the applicability and the safety of new IPS system, field tests were performed. A new IPS system applied in a trench excavation performed successfully. Basic principles and mechanism of IPS system and measure performance were presented and discussed.

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Anlysis and Design of Wale in Innovative Prestressed Support(IPS) System (혁신적 프리스트레스트 가시설(IPS)공법에 적용되는 띠장의 설계 및 해석)

  • Kim, Sung-Bo;Han, Man-Yop;Kim, Moon-Young;Kim, Nak-Kyung;Ji, Tea-Sug
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.18 no.1
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    • pp.79-91
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    • 2005
  • The behaviors and design procedures of wale in innovative prestressed support(IPS) system are presented in this paper. Using the theory of the beam on elastic foundation, the member forces of the wale under initial pretension are evaluated. Choosing cable tensions as redundant forces, member forces subjected to earth pressure are calculated by the statically indeterminate analysis. The computer analysis model under uniform and non-uniform earth pressure is constructed using beam element for the IPS wale, tension-only element for cable, and compression-only element for soil. Axial forces and bending moments of IPS wale under initial pretension and design earth pressure are calculated. The combined stresses due to these axial force and bending moment are estimated to satisfy the design formula.

Estimation for Equivalent Flexural Stiffness of Innovative Prestressed Support(IPS) Wale (혁신적 프리스트레스트 가시설(IPS)의 띠장에 대한 등가 휨강성의 산정)

  • Kim, Sung Bo;Kim, Hun Kyom;Heo, In Sung
    • Journal of Korean Society of Steel Construction
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    • v.21 no.4
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    • pp.393-401
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    • 2009
  • The flexural-stiffness formula of the wale for the innovative prestressed support (IPS) system was precisely derived, and the equivalent beam stiffness was introduced for application in the actual design of the IPS wale. The cable tension forces of the IPS wale were calculated in both cases, and the axial-deformation effects were included and ignored, respectively. The central displacements of the 1-post, 2-post, 3-post, and 4-post IPS wales were calculated based on the principle of virtual work. The effects of the IPS wale length and cable inclination angle were also investigated using the derived central displacements. The simplified equivalent flexural stiffness of the IPS wale is presented herein for design purposes, and the validity of the proposed design formula was verified through its comparison with the FE and analysis solutions.

A Model Test of Earth Retention System with Prestressed Wale (프리스트레스트 띠장을 적용한 흙막이 시스템의 모형 시험)

  • Park, Jong-Sik;Kim, Sung-Kyu;Joo, Yong-Sun;Jang, Ho-June;Kim, Nak-Kyung
    • Journal of the Korean Geotechnical Society
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    • v.23 no.7
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    • pp.27-36
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    • 2007
  • A model test was performed to evaluate the stability of a new earth retention system with a prestressed wale. For the model test, the dimensional analysis of a full-scaled earth retention system with prestressed wales was performed. Details of the dimensional analysis of the new earth retention system were presented in this paper. Based on the results of the dimensional analysis, the model-scaled earth retention system with a prestressed wale was simulated. The lateral earth pressures on the wall, the lateral deflection of the prestressed wale, the sectional force on members of the prestressed wale system, and the loads of struts were measured during construction simulation. The measured results were evaluated and compared with those of the design criterion. From the measurements, the behavior of this earth retention system was investigated.

Design of Building Excavation Plane in Innovative Prestressed Scaffolding(IPS) System (혁신적 프리스트레스트 가시설 구조시스템(IPS)을 적용한 굴착면의 해석 및 설계)

  • Kim, Sung-Bo;Han, Man-Yop;Kim, Moon-Young;Jung, Kyoung-Hwan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.1A
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    • pp.163-171
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    • 2006
  • The behaviors and design procedures of building excavation plane in innovative prestressed support (IPS) system are presented in this paper. Determination procedure for initial pretension in IPS wale subjected to design earth pressure is derived. The computer analysis model under uniform and non-uniform earth pressure is constructed using beam element for the IPS wale, tension-only element for cable, and compression-only element for soil. Axial forces and bending moments of IPS wale under initial pretension and design earth pressure are calculated. The combined stresses due to these axial force and bending moment are calculated and safety condition of building excavation plane is investigated.

Stability of the Innovative Prestressed wale System Applied in Urban Excavation (도심지 굴착에 적용된 IPS 띠장의 안정성)

  • Kim, Nak-Kyung;Park, Jong-Sik;Jang, Ho-Joon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.9 no.2
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    • pp.225-235
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    • 2005
  • The stability of innovative prestressed wale system applied in urban excavation was investigated. The IPS is a wale system prestressed by tension of steel wires. The IPS consists of steel wires, H-beam support and wale. The IPS provides a high flexural stiffness to resist the bending moment caused by earth pressures. And the IPS transmits earth pressures due to excavation to corner struts. The IPS provides a larger spacing of support, economical benefit, construction easiness, good performance and safety control. This paper explains basic concept and mechanism of the IPS and presents the measured performances of the IPS applied in urban excavation. In order to investigate applicability and stability of the IPS in urban excavation, observations and measurements in site were performed. The IPS applied in urban excavation was performed successfully. The results of the field instrumentation were presented. The measured performances of the IPS were investigated. And behavior of the wall and corner struts was investigated.