• Title/Summary/Keyword: precast pier

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Effects of Design Parameters of Steel-Embedded Precast Composite Piers (강재매입형 조립식 합성교각의 설계 변수 영향)

  • Shim, Chang-Su;Lim, Hyun-Sik;Chung, Young-Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.53-54
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    • 2009
  • Steel-embedded composite piers provide flexible design alternatives to satisfy the required performance due to various design parameters of composite sections. For the fast construction of composite piers, bolt connection can be utilized for small size piers and post-tensioning to the pier segments for the large size piers. In this paper, experimental results on composite piers were investigated to evlauate the effects of design parameters on the behavior of composite piers. Appropriate sections and their integration methods were suggested according to the design conditions. For the modular construction of bridge piers, pier segments need to be divided considering their weight and careful considerations on details to adjust fabrication and construction error. Connection details for the pier cap were also proposed.

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Development of Creative Design and Construction Methods of Bridge Piers using 3D Model (3차원 모델 기반의 미적 교각 설계 및 시공 기술 개발)

  • Lee, Sang-Yong;Dong, Ngoc Son;Shim, Chang-Su
    • Journal of KIBIM
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    • v.5 no.2
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    • pp.12-18
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    • 2015
  • Bridge piers typically have circular or rectangular shapes without decorative design. Prefabrication for accelerated construction has been widely adopted in bridge structures. Cost for steel formwork is a main restriction of creative irregular shapes. 3D modelling techniques allow creative design of columns and 3D printing provides possibility to minimize the fabrication cost. In this paper, 3D design process of bridge piers was suggested by converting 2D picture into 3D decorative shape. Formwork design using 3D printed panels was also proposed and mock-up tests were conducted. Precast columns need accurate geometry control from fabrication to assembly. Laser scanning and geometry control devices were adopted. Through the digitalized process of design, fabrication and assembly, creative design of structures can be realized in reasonable cost range.

Nonlinear Finite Element Analysis of Prefabricated PSC Columns with Precast Footing (프리캐스트 기초부를 갖는 조립식 PSC 교각의 비선형 유한요소 해석)

  • Park, Young-Gi;Kim, Tae-Hoon;Cheon, Ju-Hyoun;Park, Se-Jin;Kim, Young-Jin;Shin, Hyun-Mock
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.177-178
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    • 2009
  • This study is based on the precast concrete bridge which recently became important field of bridge construction. to develop the connecting technology of pier and footing, the purpose of this study is to verify applicability through the result of nonlinear analysis.

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The Cross Section Optimization of P.C Box-Girder Bridge Constructed by Free Cantilever Method (FCM 으로 가설되는 P.C 박스거더교의 횡단면 최적설계)

  • 방명석;김일곤;조현준
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1991.04a
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    • pp.56-60
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    • 1991
  • Free Cantilever Method(FCM) is one of the most effective construction methods when precast prestressed concrete box girders are erected in the construction site. The special feature of FCM is that precast segments are erected in cantilever on the pier and connected in the middle of span to form the complete superstructure. Therefore each structural subsystem will be shown in each construction step and it should be analyzed for design whenever the segment is erected. In this study, the computer program was developed to optimally design the P.C box girder bridge considering tile construction sequence and verified by comparing the calculated results with the data of existing P.C box girder bridges. the sensitivity analysis was performed to show the efficiency of the developed program.

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Automated Digital Engineering Modeling of Prefabricated Bridges with Parameterized Straight Alignments (직선교량에 대한 디지털엔지니어링 모델의 선형연동 프로그램 개발)

  • Choi, Jae-Woong;Kang, Jeon-Yong;Kim, Hyun-Min
    • Journal of KIBIM
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    • v.10 no.4
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    • pp.40-49
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    • 2020
  • This report describes the development of a program that can be linked to an alignment and extracts related information using a prefab structured digital engineering model. The subject bridge was set as a straight alignment, the Superstructure type as Precast girder and the Substructure type as Precast pier and Cast-in-situ Abutment. We identified the variables required to create a digital engineering model and reviewed them to create the digital engineering model by entering them as numerical values in the program. In addition, it is configured so that the variables linked to the alignment can be entered numerically. The quantity takeoff can be calculated when the design is complete. The purpose of the program development presented in this report is to enable the designers to select the optimal alternative by designing a bridge that best fits their current situation, extracting the relevant information and then by providing it to the manufacturer and construction company.

Structural Performance Evaluation of Offshore Modular Pier Connection using Ultra-high Performance Concrete (초고성능 콘크리트를 활용한 해상 모듈러 잔교 연결부의 구조성능 평가)

  • Lee, Dong-Ha;Kim, Kyong-Chul;Kang, Jae-Yoon;Ryu, Gum-Sung;Koh, Kyung-Taek
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.10 no.3
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    • pp.351-357
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    • 2022
  • In this study, offshore modular pier system using the ultra-high performance concrete was developed for the offshore construction environment. For the application of offshore modular pier system, the design, fabrication, and construction performance evaluation were performed using ultra-high performance concrete a compressive strength 120 MPa or more and a direct tensile strength 7 MPa or more. For offshore piers previously constructed with precast concrete, it was intended to verify the idea and possibility of solving errors due to position or vertical deformation during the driving of the foundation pile part during the construction stage. Furthermore, a offshore modular pier system was fabricated with ultra-high performance concrete for the construction performance evaluation. The results showed that a offshore modular pier system secured about 9 % of sectional performance of load bearing capacity under ultimate load conditions. If the offshore modular pier system developed through this study is utilized in the future, it is judged that competitiveness due to sufficient durability and constructability can be secured.

Seismic Performance of Hollow Rectangular Precast Segmental Piers (프리캐스트 중공 사각형 철근콘크리트 교각의 내진성능)

  • Lee, Jae-Hoon;Park, Dong-Kyu;Choi, Jin-Ho;Shin, Sung-Jin
    • Journal of the Korea Concrete Institute
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    • v.24 no.6
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    • pp.705-714
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    • 2012
  • Precast reinforced concrete bridge columns with hollow rectangular section were tested under cyclic lateral load with constant axial force to investigate its seismic performance. After all the precast column segments were erected, longitudinal reinforcement was inserted in the sheath prefabricated in the segments, which were then mortar grouted. Main variables of the test series were column aspect ratio, longitudinal reinforcement ratio, amount of lateral reinforcement, and location of segment joints. The aspect ratios were 4.5 and 2.5, and the longitudinal steel ratios were 1.15% and 3.07%. The amount of lateral reinforcement were 95%, 55%, 50%, and 27% of the minimum amount for full ductility design requirements in the Korean Bridge Design Code. The locations of segment joints in plastic hinge region were 0.5 and 1.0 times of the section depth from the bottom column end. The test results of cracking and failure mode, axial-flexural strength, lateral load-displacement relationship, and displacement ductility are presented. Then, safety of the ductility demand based seismic design in the Korean Bridge Design Code is discussed. The column specimens showed larger ductility than expected, because buckling of longitudinal reinforcing bar was prevented due to confinement developed not only by transverse steel but also by sheath and infilling mortar.

Seismic performance of prefabricated bridge columns with combination of continuous mild reinforcements and partially unbonded tendons

  • Koem, Chandara;Shim, Chang-Su;Park, Sung-Jun
    • Smart Structures and Systems
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    • v.17 no.4
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    • pp.541-557
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    • 2016
  • Prefabricated bridge substructures provide new possibility for designers in terms of efficiency of creativity, fast construction, geometry control and cost. Even though prefabricated bridge columns are widely adopted as a substructure system in the bridge construction project recently, lack of deeper understanding of the seismic behavior of prefabricated bridge substructures cause much concern on their performance in high seismic zones. In this paper, experimental research works are presented to verify enhanced design concepts of prefabricated bridge piers. Integration of precast segments was done with continuity of axial prestressing tendons and mild reinforcing bars throughout the construction joints. Cyclic tests were conducted to investigate the effects of the design parameters on seismic performance. An analytical method for moment-curvature analysis of prefabricated bridge columns is conducted in this study. The method is validated through comparison with experimental results and the fiber model analysis. A parametric study is conducted to observe the seismic behavior of prefabricated bridge columns using the analytical study based on strain compatibility method. The effects of continuity of axial steel and tendon, and initial prestressing level on the load-displacement response characteristics, i.e., the strain of axial mild steels and posttensioned tendon at fracture and concrete crushing strain at the extreme compression fiber are investigated. The analytical study shows the layout of axial mild steels and posttensioned tendons in this experiment is the optimized arrangement for seismic performance.