• Title/Summary/Keyword: PSC beam 교

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Improved prediction of residual effective prestress force of Railway bridge PSC beam (철도교 PSC Beam의 잔류유효긴장력 추정 개선방안 연구(I))

  • Lee, Seong-Won;Lee, Ki-Seong;Lee, Won-Chang
    • Proceedings of the KSR Conference
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    • 2003.10b
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    • pp.538-543
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    • 2003
  • This study is the developed prediction of residual effective prestress force of prestressed concrete beam bridges. Developed prediction method is based on the center camber of prestressed concrete beam, structural design. report of various PSC beams, construction reference materials of PSC beams. Evaluation of residual effective prestress force by developed method is compared with evaluation by structural design. This comparison results shows that this developed method is very effective method. Therefore prediction of residual effective prestress force by this developed method will be used for evaluation of the rating of various PSC beam bridges(road bridges and railway bridges).

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Evaluation of rating of railway bridge PSC beam by prediction of residual effective prestress force (잔류유효긴장력 추정에 의한 철도교 PSC Beam의 내하력 평가기법)

  • Lee Seong-Won;Lee Ki-Seong;Kim Hyeon-Gil
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.1203-1208
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    • 2005
  • This study is the evaluation of rating of railway prestressed concrete beam bridges by prediction of residual effective prestress force. Therefore, developed prediction method is based on the center camber of prestressed concrete beam, structural design report of various PSC beams, construction reference materials of PSC beams. Both rating evaluation and residual effective prestress force by developed method is compared with evaluation by structural design. This comparison results shows that this developed method is very effective method. Therefore evaluation of rating by prediction of residual effective prestress force will be used for evaluation of the rating of railway PSC beam bridges.

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Approximate Estimating Model Using the Case Based Reasoning - PSC BEAM Bridge - (사례기반추론을 이용한 개략공사비 산정모델 개발 - PSC BEAM교를 중심으로 -)

  • Kang, Chan-Sung;Lee, Geon-Hee;Kim, Kyoung-Min;Kim, Kyong-Ju
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2008.11a
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    • pp.445-448
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    • 2008
  • This study attempts to estimate approximate cost on construction of PSC BEAM Bridge using Case-Based Reasoning and suggests approximate estimation model at the planning and design stage. This paper suggests phased influence factors on construction cost and approximate estimation model for integrated project cost management.

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An Analysis of the Characteristics of Environmental Impact for PSC Beam Bridges using Life Cycle Assessment (LCA 기반 PSC 교량의 환경부하 특성분석에 대한 연구)

  • Cho, Namho;Yun, Won Gun;Lee, Wan Ryul;Kim, Kyong Ju
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.36 no.2
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    • pp.297-305
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    • 2016
  • This study aims to analyze characteristics of environmental load for the construction phase of PSC beam bridge based on Life Cycle Assessment. For detail computation of environmental load, the construction materials and energy consumption are derived from the BOQ, also connecting with environmental load by Korea LCI Database Information Network. The characteristic of environmental impact was analyzed by 25 cases and cut-off ratio was 80% to 94%. The result sorted by construction materials revealed that environmental load were 53.3% for ready-mixed concrete, 9.6% for wire rod, 7.8% for rebar, 6.8% for cement, 5.5% for plywood, and 5.2% for energy. Furthermore, the result of environmental impact revealed that 45.5% for global warming, 30.4% for abiotic resources depletion, 10.5% for human toxicity, and 8.9% for photochemical oxidant creation. In the future, we can make a decision considering environmental load based on LCA at design phase.

Nonlinear FEM analysis of Cable-stayed PSC Bridges Considering Time-dependent Behavior (시간 의존적 거동을 고려한 PSC 사장교의 비선형 유한요소해석)

  • Cho, Hwak-Shin;Seong, Dae-Jeong;Im, Duk-Ki;Shin, Hyun-Mock
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.2
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    • pp.177-184
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    • 2011
  • In this paper the nonlinear analysis that include time-dependent characteristics of materials and geometric nonlinearity of elements for the cable-stayed PSC bridges is presented. Analysis models for finite element method were developed based on the flexibility based fiber beam-column model originally proposed by Spacone et al.(1996). The developed analysis model implemented in general purpose object-oriented finite element analysis program named HFC(Cho 2009). The performance of proposed analysis models is evaluated by comparing with the former results of the design data. The deflection of time dependent analysis is larger than time ignored analysis on construction sequences, and the bridge is destructed at a smaller deflection than the time ignored analysis on failure behavior.

An Analysis of the Characteristics of Standard Work and Design Information on Estimating Environmental Loads of PSC Beam Bridge in the Design Phase (PSC Beam 교량의 설계단계 환경부하량 산정을 위한 공종 및 설계정보 특성 분석)

  • Yun, Won Gun;Ha, Ji Kwang;Kim, Kyong Ju
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.37 no.4
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    • pp.705-716
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    • 2017
  • As many environmental pollution problems have arisen, various studies related to the environmental evaluation have been carried out in the construction industry. However, there is no methodology for estimating the environmental load quickly for design alternatives of civil facilities in the design phase. This study aim to establish criteria of works information and designed parts which can efficiently estimate environmental loads of PSC beam bridge based on standard quantity at the early design phase. For this purpose, a detailed environmental loads database was constructed by performing Life Cycle Assessment (LCA) based on detailed design data of 25 bridges. In addition, major work with high impact on environmental load were selected, and the analysis of characteristics of environmental load according to the required materials and 8 impact categories were conducted. As a result, the superstructure accounted for 42.91%. In the superstructure, remicon of the material base and PSC beam work occupied 53.13% and 31.25%. In the substructure, remicon, rebar, and cement, which are material base, accounted for more than 93%. It is expected that this major work and material information for each part of bridge can be utilized in the construction of the model, which can estimate the approximate environmental load, reflecting the characteristics of the structure in the design phase.

Numerical Analysis at Anchorage Zone Using Prestressing Order for PSC Bridges (PSC 교량 정착부의 강선긴장순서에 대한 수치해석 연구)

  • Jo, Byung-Wan;Tea, Gi-Ho;Oh, Sea-Jun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.5
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    • pp.97-105
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    • 2006
  • PSC box girder bridges usually have a lot of tendons, and the difference of the bursting forces lies in the prestressing order of the tendons. As a result of the lack of studies on the prestressing order for the bridges, the order depends on the designer's intuition and experiences. In this paper, with investigation into various methods determining the bursting force of the anchorage, reasonable prestressing order is determined by analysis of PSC beam bridge and PSC box girder bridge with most suitable method. It may be stated that this study would be useful for determining the reasonable prestressing order of tendons for the PSC box girder bridges.

The Effect of Design Parameter on the Beam Depth of IPC Girder Continuous Bridge (교량설계 변수가 IPC 거더 연속교의 형고에 미치는 영향)

  • 한만엽;김보형;김상완
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.125-130
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    • 2001
  • A existing design method of PSC girder bridges, according to total service loads, stress required tendon force at a time. Because this design method increases beam depth, design of long span is difficult. However, As UC girder stressing at difficult loading stages reduces sectional depth of PSC girder, both design and operation of long span bridges is possible. so, this study analyzes the effect of design parameter (Girder Strength, Girder Spacing, Span Length, Joint Strength) on the beam depth of IPC girder continuous bridges, and shows sectional depth of UC girder for design of long span bridges. According to analysis, when a continuous bridges of same length span is at strength of joint over strength of girder of 600kg/$cm^{2}$, a change of beam depth is observed and when a continuous bridges of different span length is at strength of joint below strength of girder of 600kg/$cm^{2}$, a change of beam depth is observed. In two case, a change of beam depth is mostly observed over strength of girder of 350kg/$cm^{2}$ according to analysis of deflection data, a continuous bridges of IPC girder is nearly satisfied.

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The Efficiency of 3D Design in the PSC Beam Bridge (PSC Beam 교에서의 3D 설계 효용성)

  • Shin, Wook-Beom;Ahn, Do-Hwan
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.104-107
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    • 2008
  • A case study is conducted by between using 3D integrated automatic design software(ABeamDeck, AAbutPier) and using autocad without program to validate the method. As a result, there are many profits introducing the 3D design in the construction, especially, to make up for defect of existing design method. 3D design will enhance the efficiency of construction tasks by supporting a system of sharing and exchanging information throughout all the stages of construction, from design, production and installation to maintenance.

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Construction Sequence Measurement & Analysis for Continuous 8-span Prestressed Concrete(PSC) Girder Bridge (8경간 연속화 프리스트레스 거더교의 시공 계측 및 분석 -서울교 확장교량 적용)

  • 조성웅;이원표;임현태
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.985-990
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    • 2001
  • The widened Seoul-Bridge is the first continuous 8-span prestressed concrete(PSC) girder bridge in domain. The construction sequence of the bridge consists of S steps in a large way. The measuring in construction stage includes the determination of the allowable fluctuation value of beam stress in each step and the measurement beam stress during prestessing. The measured tendon prestress force was compared with the design value. When it was compared with the analytic result, the difference between the measured stress and the analytic stress was below allowable error. The friction loss and the anchorage slip loss of the tendon prestress force was lower than the design loss value.

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