• Title/Summary/Keyword: CFTA girder

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Detection of Manufacturing Defects in Stiffness of CFTA Girder using Static Loading (정적 시험을 사용한 CFTA거더의 제조시 강성 결함 탐색)

  • Kim, Doo-Kie;Alfahdawi, Nathem;Cui, Jintao;Park, Kyung-Hoon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.1
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    • pp.109-116
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    • 2012
  • This paper presents a study on the nonlinear behavior of an innovative bridge girder made from concrete-filled and tied tubular steel arch (CFTA) under static loading. Manufacturing of the CFTA girder may have defects which may highly affect the symmetry and performance of the structure. A simple method is proposed by using stiffness extracted from static test data to detect manufacturing defects of the CFTA girder. A three-dimensional finite element model was used in the numerical analysis in order to verify the method. The proposed method was experimentally validated through static tests of the CFTA girder. The application of the proposed method showed that it is effective in identifying invisible manufacturing defects of the CFTA girder, especially for mass production of a standard type in the factory.

Structural Performance Analysis of New Type CFTA Girder Bridge (신형식 CFTA 거더 교량의 구조성능평가)

  • Lee, Ji-O;Jeong, Min-Chul;Park, Kyung-Hoon;Kong, Jung-Sik
    • Journal of the Korean Society of Hazard Mitigation
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    • v.11 no.1
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    • pp.15-22
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    • 2011
  • In this research, static load test is performed to verify the arch effect and structural performance of CFTA(Concrete-Filled and Tied steel tubular Arch) girder, and FE(Finite Element) analysis is performed to investigate validity of the test result. CFTA girder is designed to maximize the benefit of each material, such as steel plate, filled concrete and PS tendon. Static load test is performed based on the frame-analysis result of 12m sample miniature model. The result of static load test is that structural performance and safety of CFTA girder are confirmed and there is different deflection mode with other structural form result from arch effect. FE analysis with ABAQUS is also performed to show the validity of the truck collision safety and static load test.

Analytical Technique on CFTA Girder Bridge Considering Construction Sequence (시공단계를 고려한 CFTA 거더교의 해석기법)

  • Park, Seung-Jae;Kim, Yong-Jae;Jeon, Jong-Su;Park, Myoung-Gyun;Park, Kyung-Hoon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.167-168
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    • 2009
  • The CFT structure is applied to newly developed CFTA girder because of improvement of ductility deformation, stiffness and internal force of structure owing to the interaction between steel tube and core concrete. CFTA girder is the structure which can reduce tensile stress due to external loads by using its arch shape and prestress force. This paper proposed constructional stage procedure and represented analytical technique considering constructional stage to investigate the safety against bridge collapse on construction and on operation.

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Effects of tendon damage on static and dynamic behavior of CFTA girder

  • Vu, Thuy Dung;Lee, Sang Yoon;Chaudhary, Sandeep;Kim, Dookie
    • Steel and Composite Structures
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    • v.15 no.5
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    • pp.567-583
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    • 2013
  • Experimental studies and finite element analyses have been carried out to establish the effect of tendon damage on the structural behavior of concrete filled tubular tied arch girder (CFTA girder). The damage of tendon is considered in different stages by varying the number of damaged cables in the tendon. Static and dynamic structural parameters are observed at each stage. The results obtained from the experiments and numerical studies have been compared to validate the studies. The tendons whose damage can significantly affect the stiffness of the CFTA girder are identified by performing the sensitivity analysis. The locations in the girder which are sensitive to the tendon damage are also identified.

Static Behavior of Concrete-Filled and Tied Steel Tubular Arch(CFTA) Girder (CFTA거더의 정적 거동연구)

  • Kim, Jong-In;Kim, Doo-kie;Lee, Jang-hyeong;Kim, Jeong-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.13 no.3 s.55
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    • pp.225-231
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    • 2009
  • This study introduces the CFTA girder(Concrete-Filled and Tied Steel Tubular Arch Girder) which is a combined structural system of traditional CFT, arch, and prestress structures. Static load tests and structural behavior analyses were carried out for a 25m long CFTA girder. In the analysis, each load of 58kN, 88kN, 148kN, 207kN,and 298kN was applied incrementally at the positions of 1.0 m distances in both directions from the center of the girder. On each test, strain and displacement were measured. Linear static FEM analyses using Strand7 code were also performed to check the structural stability and to investigate the effects of prestressing(${\pm}$20%) and material property(Young's modulus) on the displacement and strain. The results of this study are summarized as follows: the initial strain & displacement under selfweight and prestressing were influenced with the variation of prestressing, but they were mainly effected only by Young's modulus when additional loads were applied.

Linear-Elastic Behavior Analysis of CFTA Girder Filled with High-Strength Concrete (고강도 콘크리트를 적용시킨 CFTA 거더의 선형 탄성 거동분석)

  • Choi, Sung-Woo;Lee, Hak;Jung, Min-Chul;Kong, Jung-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.511-516
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    • 2008
  • Recently, many researchers are studying a high-strength concrete, composite materials and composite structures to build structures more economic and stable all over the world. For instance, there is CFTA(Concrete Filled and Tied Steel Tubular Arch) girder that applies an arch structure and a pre-stressed structure to CFT(Concrete Filled Steel Tubular) Structure to maximize the efficiency of structure and economic. In this study, linear-elastic behavior analysis of CFTA gider filled with high-strength concrete was performed by using ABAQUS 6.5-1 and also the result was analyzed.

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Analytical Model for CFTA Girder (CFTA 거더의 해석모델 개발)

  • Jeon, Jong-Su;Park, Seung-Jae;Kim, Yong-Jae;Park, Myoung-Gyun;Kim, Jung-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.169-170
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    • 2009
  • CFT structure has many advantages compared with the ordinary structural member made of steel or reinforced concrete. Because of increases in ductility, stiffness and load carrying capacity of overall structure owing to confinement effect of steel box and concrete, CFT structure is widely used to columns. Recently, the utilization of CFT member has been expanded to bridge structure as a girder member. The purpose of this study is to develop the analytical model and propose design method for CFTA girder bridge consisting of CFT structure, arch shape and tendons.

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Behavior of Concrete-Filled and Tied Steel Tubular Arch Girder (콘크리트 충전 타이드 아치형 강재 합성거더의 선형 거동 분석)

  • Lee, Hak;Park, Ho;Lee, Eun-Ho;Kim, Jung-Ho;Kong, Jung-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2007.04a
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    • pp.688-693
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    • 2007
  • Nowadays various studies related with superstructure of bridges are developed and they pursuit more effective section of bridges superstructure, material and economical application of composite materials. CFT structure(Concrete Filled Steel Tubular Structure) is developed type of composite structure that concrete is filled with steel box, and the deformation of the member, stiffness and internal force will be improved by confinement effect of steel box and concrete. This paper introduces new type of girder, CFTA girder( Concrete- Filled and Tied Steel Tubular Arch Girder) which is combined with traditional CFT structure,arch effect and prestress through carrying out the structural analysis by computer programs. The computer programs which is used are ABAQCS and MIDAS, and the 12.2m girder which is applied same load and prestresses is analyzed and compared the results respectively.

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Linear Behavior Analysis and Stability Assessment of CFTA Girder (CFTA거더의 선형거동 분석 및 안정성 평가)

  • Jeong, Min-Chul;Yi, Sun-Ae;Kong, Jung-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.271-274
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    • 2009
  • 강관의 내부에 콘크리트를 충전한 콘크리트 충전 강관 구조(CFT 구조, Concrete Filled Steel Tubular Structure)는 강재와 콘크리트의 단점을 상호 보완하고, 장점을 극대화 할 수 있다는 이점 때문에 최근 실제 구조물의 시공에 적용하는 사례가 증가하고 있는 추세이다. 이와 같은 CFT 거더의 장점을 살리면서 CFT 거더보다 더 뛰어난 경제적, 구조적 효율성을 얻기 위해 기존의 CFT 구조에 아치 형식과 프리스트레스를 도입한 CFTA(Concrete Filled and Tied Tubular Arch) 거더에 관한 연구가 현재 진행중이다. 본 연구에서는 CFTA 거더의 현장 실험과의 비교를 위해 ABAQUS 6.5-1을 이용하여 CFTA 거더의 유한요소 해석을 수행하였고, 이를 바탕으로 구조물의 선형거동을 분석하였다. 또한 구조물의 위험도 분석을 위해 본 구조물의 가장 약점으로 지적되고 있는 외부로 노출되어 있는 긴장재의 차량 충돌에 의한 사고를 가정하여 이를 고려한 유한 요소 해석을 수행하여 CFTA 구조물의 동적 및 정적 안전성 평가를 수행하고 그 결과를 분석하였다.

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Dynamic Analysis and Safety Estimation of New Type Girder Filled by High-Strength Concrete (고강도 콘크리트를 적용시킨 신형식 거더의 동적해석 및 안정성 평가)

  • Choi, Sung-Woo;Lee, Hak;Kong, Jung-Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.213-216
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    • 2008
  • CFT(Concrete Filled Steel Tubular) Structure filled steel tubes with a concrete improves the stiffness and strength of the structure by the confinement effect of fillers. CFTA(Concrete Filled and Tied Steel Tubular Arch) girder is a new type structure that applies an arch structure and a pre-stressed structure to CFT Structure to maximize the efficiency of structure and economic. One of conspicuous characteristics of CFTA girder is exposed tendon and that is pointed out as the weak point of this girder. Therefore in this study, safety estimation for the exposed tendon is performed and dynamic analysis is also performed by the collision numerical simulation. For analyzing this model, ABAQUS 6.5-1 was used.

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