• Title/Summary/Keyword: post-tensioning

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New Approach to Integrated Structural Analysis and Design for Multistory RC/Post-Tensioned Buildings (ADAPT Edge 2012-RC/PT 다층 구조물 해석 및 설계 프로그램)

  • Aalami, Florian;Lee, Soo Heon
    • Computational Structural Engineering
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    • v.25 no.4
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    • pp.63-70
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    • 2012
  • This article introduces ADAPT Corporation's latest software product for the integrated multistory analysis and design of concrete buildings, ADAPT Edge. Edge uniquely packages user-friendly modeling of multistory buildings, accurate gravity and lateral analysis, post-tensioning, and detailed slab and beam design, all in one software package. The benefits of Edge over traditional concrete design software are explained.

Nonlinear Analysis using ABAQUS Software of Reinforced Concrete (RC) Beams Strengthened with Externally Post-tensioning Steel Rods (외적 포스트텐셔닝 강봉으로 보강된 철근콘크리트 보의 ABAQUS를 이용한 비선형해석)

  • Lee, Swoo-Heon;Shin, Kyung-Jae;Kim, Jin-Wook;Lee, Hee-Du
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.2
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    • pp.11-17
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    • 2018
  • Concrete is the well-used material in many architectural and civil structures. The behavior of concrete does exhibit a different characteristic in compression and tension, and it also shows an inelastic-nonlinear behavior. In addition, the concrete properties vary slightly depending on the environmental factor and manufacturer. These properties of concrete make the modeling or simulation of concrete material difficult. In reinforced concrete, particularly, there is a difficulty in bond-slip relationship between concrete and steel. However, in this paper, reserving remainder of these limits the finite element analysis for reinforced concrete beams through ABAQUS simulation has been carried out with some assumptions. Assumptions include the perfect bond of steel and concrete as well as the concrete damaged plasticity (CDP) in concrete property. There is a reasonable agreement between the experimental and numerical results, although the analytical strength and external rod deformation are slightly overestimated. The average and standard deviation between two results are 1.05 and 0.05, respectively. And the models and the computations lead to the evolution of fracture in bending beam.

Modeling of post-tensioned one-way and two-way slabs with unbonded tendons

  • Kim, Uksun;Huang, Yu;Chakrabarti, Pinaki R.;Kang, Thomas H.K.
    • Computers and Concrete
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    • v.13 no.5
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    • pp.587-601
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    • 2014
  • A sophisticated finite element modeling approach is proposed to simulate unbonded post-tensioned concrete slabs. Particularly, finite element contact formulation was employed to simulate the sliding behavior of unbonded tendons. The contact formulation along with other discretizing schemes was selected to assemble the post-tensioned concrete system. Three previously tested unbonded post-tensioned two-way and one-way slabs with different reinforcement configurations and boundary conditions were modeled. Numerical results were compared against experimental data in terms of global pressure-deflection relationship, stiffness degradation, cracking pattern, and stress variation in unbonded tendons. All comparisons indicate a very good agreement between the simulations and experiments. The exercise of model validation showcased the robustness and reliability of the proposed modeling approach applied to numerical simulation of post-tensioned concrete slabs.

Precast Full Span Construction of Continuous PSC Box Girder Bridge for High Speed Railway (고속철도 PSC 박스거더 연속고의 프리캐스트 경간 일괄 가설)

  • Park Jeong Wha;Kim Kwang Soo;Sim Chungwook;Yoon Chul-Soo
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.1168-1173
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    • 2004
  • Bridges and tunnels mainly compose the structural system of Kyung-bu high-speed railway in Korea and the prestressed concrete box girder bridges are applied for the most part of bridge structures. Precast full span construction method was practiced in the construction of many prestressed concrete box girder bridges in Kyung-bu high speed railway for the high quality, great construction speed, low construction cost and construction safety. However, there have been no application of this method in continuous bridges until now. Therefore, a new advanced precast full span construction method is developed using pre-tensioning for precast and post-tensioning in alternating the simple span into a continuous bridge system. since the high-speed railway trains can cause dynamic problems in a continuous bridge. This study shows the structural behavior and the construction process of the new advance method.

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Development and application of a hybrid prestressed segmental concrete girder utilizing low carbon materials

  • Yang, Jun-Mo;Kim, Jin-Kook
    • Structural Engineering and Mechanics
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    • v.69 no.4
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    • pp.371-381
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    • 2019
  • A hybrid prestressed segmental concrete (HPSC) girder utilizing low carbon materials was developed in this paper. This paper introduces the hybrid prestressing concept of pre-tensioning the center segment and assembling all segments by post-tensioning, as well as the development process of the low carbon HPSC girder. First, an optimized mix proportion of 60 MPa high strength concrete containing high volume blast furnace slag was developed, then its mechanical properties and durability characteristics were evaluated. Second, the mechanical properties of 2,400 MPa high strength prestressing strands and the transfer length characteristics in pre-tensioned prestressed concrete beams were evaluated. Third, using those low carbon materials and the hybrid prestressing concept, the HPSC girders were manufactured, and their structural performance was evaluated. A 30-m long HPSC girder for highway bridges and a 35-m long HPSC girder for railway bridges were designed, manufactured, and structurally confirmed as having sufficient strength and safety. Finally, five 35-m long HPSC girders were successfully applied to an actual railway bridge for the first time.

An Experimental Study on Flexural Behavior of Continuous Prestressed Steel I-Girder with Section Increasement at Internal Supports (지점부 단면형고 확대를 도입한 연속 프리스트레스트 Steel I-Girder의 휨거동에 관한 실험적 연구)

  • Kim, Kyung-Min;Hong, Sung-Nam;Yang, Dong-Suk;Park, Sun-Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.6
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    • pp.143-153
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    • 2006
  • The paper presents the results of a study on improvement in flexure capacities of continuous prestressed steel I-girder with section increasement at internal supports. After tensioning, the field experiment on prestressed steel I-girder has been performed in the various aspects of prestressed I-girder introducing section increasement at internal supports, tendon profile.

Development and Analysis of Unbonded Post-tensioned Anchorage for Single Tendon (비부착식 단일 강연선용 포스트텐션 정착구 개발 및 응력해석)

  • Lee, Young Hak;Cho, Yong Woo;Kim, Min Sook
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.1
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    • pp.39-46
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    • 2018
  • In this paper, an unbonded post-tensioning anchorage for a single-stranded wire that allows more efficient stress distribution in the post-tensioned anchorage zone was developed by using a finite element analysis using a commercial program. The stress analysis was carried out using a 3D model in the anchorage zone of the concrete member using the developed anchorage. The result of analysis ensured that the developed anchorage reduced the maximum bursting stress in anchorage zone compared to the case of existing anchorage and the location where maximum bursting stress also occurred closer to the anchorage. Bursting force was calculated using AASHTO, modified $M{\ddot{o}}rsch$ and Stone. As a result, it was concluded that an effective reinforcement design of the anchorage zone can be designed by modified $M{\ddot{o}}rsch$.

Experimental Analysis of Weigh-in-Motion Sensor Installed Post-Tensioned Concrete Pavement Behavior (고속축중계가 설치된 포스트텐션 콘크리트 포장의 실험적 거동 분석)

  • Park, Hee-Beom;Bae, Jong-Oh;Kim, Seong-Min;An, Zu-Og
    • International Journal of Highway Engineering
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    • v.12 no.3
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    • pp.139-146
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    • 2010
  • This research was conducted to analyze the behavior of the post-tensioned concrete pavement (PTCP) system in which weigh-in-motion (WIM) sensors were installed. One lane of PTCP was constructed after removing the existing asphalt pavement. The frictional resistance between the slab and the underlying layer should be small enough for the PTCP slab to properly have prestresses by tensioning. By performing an experimental construction of PTCP, the friction effects and the longitudinal displacements of PTCP under environmental loads were investigated. Based on the knowledge obtained from the experiments, the actual PTCP sections including WIM sensors were constructed and the curling behavior of the system was investigated. As a result, the behavior of the PTCP system was not affected by the existence of WIM sensors, and the appropriate PTCP system when installing WIM sensors in it could be developed.

Analysis of Post-tensioned Bridge by Specially Orthotropic Laminate Theory (I) - Reinforced Concrete Slab Bridge (특별직교이방성 이론에 의한 포스트 텐션된 교량의 해석(I) - 철근 콘크리트 슬래브교 -)

  • 김덕현;원치문;이정호
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.135-140
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    • 2001
  • A post-tensioned reinforced concrete slab bridge is analyzed by specially orthotropic laminate theory. Symmetrically reinforced slab with tension and compression steel is considered for convenience of analysis. Each longitudinal and transverse steel layer is regarded as a lamina, and material constants of each lamina is calculated by the use of the rule of mixture. This bridge is under uniformly distributed vertical loads, and axial loads and end moments due to post-tensioning. In this paper, finite difference method is used for numerical analysis of this bridge. Theory and analysis method of specially orthotropic laminate plates used in this paper can be used for design of new bridges, and maintenance and repair of old bridges.

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Shear Resistance Capacity of Precast Post-tensioned Concrete Beam-Column Connection (프리캐스트 포스트텐션 콘크리트 보-기둥 접합부의 전단성능)

  • 조경호;이종규;최광호;김상식
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.769-774
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    • 2000
  • The first thing in developing precast post-tensioned concrete frame system verify the shear resistance capacity of the beam-column connection at which the transfer of member forces become discontinuous. Complying with the necessity of such experimental research, shear tests have been performed for six test specimens which were cast and cured at Dong-Ah Concrete Manufacturing Company and post-tensioning at Concrete Laboratory of Inha University. Shear key and magnitude of post-tensioned force are taken test variables. From the test results, it has been observed that the shear resistance of the specimens attained to higher values than those of theoritical calculations based on the shear friction with shear friction coefficient being 0.6.

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