KR970015932A - Re-prestress steel composite beam and its manufacturing method - Google Patents

Re-prestress steel composite beam and its manufacturing method Download PDF

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Publication number
KR970015932A
KR970015932A KR1019950029343A KR19950029343A KR970015932A KR 970015932 A KR970015932 A KR 970015932A KR 1019950029343 A KR1019950029343 A KR 1019950029343A KR 19950029343 A KR19950029343 A KR 19950029343A KR 970015932 A KR970015932 A KR 970015932A
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South Korea
Prior art keywords
lower flange
flange concrete
composite beam
prestress
stress
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KR1019950029343A
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Korean (ko)
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KR100244084B1 (en
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권오근
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권오영
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed
    • E01D2101/285—Composite prestressed concrete-metal

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

본 발명은 낮은 형고로 더욱 안정적인 교량을 건설할 수 있도록 하는 리프리스트레스(Re-prestress) 강합성빔 및 그 제작방법에 관한 것으로, 종래의 프리스트레스 강합성빔은 하부플랜지콘크리스트에 미리 도입시키는 프리스트레스 압축응력의 크기를 낮은 형고 유지라는 공법 자체의 근본적인 장점을 유지하기 위하여 제한된 Ⅰ자형 형강(Ⅰ형 Girder)의 형고 높이와 그에 따라 제한된 처짐 및 복귀변형의 크기에 의하므로 하부플랜지콘크리트에 아주 큰 크기의 인장응력 발생과 그에 따른 인장균열, 급격한 피로강도저하, 과도한 처짐등을 유발하는 부분프리스트레싱(Partial Prestressing)에 의해 설계될 수밖에 없었다.The present invention relates to a re-prestress steel composite beam and a method of fabricating the same, which enables the construction of a more stable bridge at a lower mold height, and the conventional prestressed steel composite beam is prestressed to be introduced into the lower flange concrete sheet in advance. In order to maintain the fundamental advantages of the process itself, the size of the stress is maintained by the limited height of the I-shaped Girder and the size of the limited deflection and return deformation. It was forced to be designed by partial prestressing, which caused tensile stress, resulting in tensile cracking, rapid fatigue strength drop, and excessive deflection.

본 발명의 리프리스트레스 강합성빔은 이와 같은 종래의 프리스트레스 강합성빔의 하부플랜지콘크리트에 균열발생 모멘트의 크기에 대체할 수 있게 하는 적정량의 인장재를 미리 배치하여 하부플랜지콘크리트(13)를 타설 양생하고, 미리 재하하였던 하중(Pf하중) 제거에 다른 하부플랜지콘크리트(13)에 1차 압축 프리스트레스 응력이 도입된 후(Release후) 하부플랜지콘크리트(13)속에 미리 배치된 인장재(14)를 인장 정착하여 하부플랜지콘크리트(13)에 2차 압축 프리스트레스 응력을 추가로 도입하는 리프리스트레스(Re-Prestress)를 가함으로써 이에 의한 부재 자체의 저항모멘트를 증가시켜 종래의 프리스트레스 강합성빔의 형고 및 단면을 그대로 유지하거나 오히려 더 낮추면서도 하부플랜지콘크리트(13)에 인장응력을 전혀 유발시키지 않는 완전프리스트레싱(Full Prestressing)에 의하여 설계가 이루어질 수 있도록 함으로써 하부플랜지콘크리트(13)의 인장균열 및 그에 따른 과도한 처짐과 급격한 피로강도저하등과 같은 종래 프리스트레스 강합성빔의 근본적인 설계 구조상의 문제점을 일소하여 더욱 안전하고 경제적인 교량건설에 이바지할 수 있게 되는 효과를 얻을 수 있다.The leafless steel composite beam of the present invention places and cures the lower flange concrete 13 by arranging an appropriate amount of tensile material in advance to replace the size of the crack generation moment in the lower flange concrete of the conventional prestressed steel composite beam. After the first compressive prestress stress is introduced to the lower flange concrete 13 to remove the previously loaded load (Pf load) (after release), the tension member 14 disposed in the lower flange concrete 13 is tension-set and Re-prestress is applied to the lower flange concrete 13 to introduce additional secondary compressive prestress stress, thereby increasing the resistance moment of the member itself, thereby maintaining the shape and cross section of the conventional prestress rigid composite beam. Or rather lower, but completely prestressed to induce no tensile stress on the lower flange concrete (13) By allowing the design to be made by full prestressing, the fundamental design structure of the conventional prestressed rigid composite beams such as the tensile cracking of the lower flange concrete 13 and the resulting excessive deflection and rapid fatigue strength reduction are eliminated. It is possible to contribute to the construction of a safe and economical bridge.

Description

리프리스트레스(Re-prestress) 강합성빔 및 그 제작방법Re-prestress steel composite beam and its manufacturing method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 한 실시예의 종단면도.1 is a longitudinal cross-sectional view of one embodiment of the present invention.

제2도는 동 실시예의 요부 측면도.2 is a side view of main parts of the embodiment.

제3도는 본 발명과 종래의 강합성빔의 제작 및 활하중작용시 각 단계의 응력발생상태비교도.Figure 3 is a comparison of the stress generation state of each step in the fabrication and live load action of the conventional composite beam and the present invention.

제4도는 본 발명과 종래의 강합성빔 제작 및 활하중작용시 각 단계의 휨모멘트 거동특성 비교응력도로써, (가)는 종래의 강합성빔의 경우, (나)는 본 발명의 경우를 각각 나타낸다.4 is a comparative stress diagram of the bending moment behavior characteristics of each stage during the fabrication and active load action of the present invention and the conventional composite beam. (A) shows the case of the conventional rigid composite beam, and (B) shows the case of the present invention, respectively. .

Claims (2)

Ⅰ자 형강(11)의 상부와 하부에 상부슬레브(12)와 하부플랜지콘크리트(13)가 마련된 것에 있어서, 상기 하부플랜지콘크리트(13)의 내부에 다수의 인장재(14)를 배치하여 인장 정착한 것을 특징으로 하는 리프리스트레스(Re-prestress) 강합성빔.In the upper slab 12 and the lower flange concrete 13 is provided on the upper and lower portions of the I-shaped steel 11, a plurality of tension members 14 are disposed in the lower flange concrete 13 to tension and fix Re-prestress composite beam, characterized in that one. Ⅰ자 형강(11)에 미리 일정크기의 휨모멘트를 발생시키는 하중(Pf하중)을 재하하고 하부플랜지콘크리트(13)를 타설한 후 미리 재하한 일정하중(Pf하중)을 제거하여 하부플랜지콘크리트(13)에 압축 프리스트레스를 도입시키는 것에 있어서, 상기 하부플랜지콘크리트(13) 내부에 다수의 인장재(14)를 미리 배치하고, 상기 1차압축 프리스트레스 도입후 각 인장재(14)를 인장 정착하여 하부플랜지콘크리트(13)에 2차 압축 프리스트레스를 도입시켜 완전프리스트레싱이 되도록 한 것을 특징으로 하는 리프리스트레스(Re-prestress) 강합성빔의 제작방법.Load the load (Pf load) to generate a certain amount of bending moment in the I-shaped steel (11) in advance, and after placing the lower flange concrete (13), remove the predetermined load (Pf load) previously loaded to lower flange concrete ( In introducing the compression prestress to 13), a plurality of tension members 14 are disposed in advance in the lower flange concrete 13, and after the introduction of the primary compression prestress, the tension members 14 are tension-fixed to lower flange concrete. A method for manufacturing a re-prestress rigid composite beam, characterized by introducing secondary compression prestressing to (13) so as to be completely prestressed. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950029343A 1995-09-07 1995-09-07 Construction method of re-prestressed steel-concrete composite beam KR100244084B1 (en)

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KR1019950029343A KR100244084B1 (en) 1995-09-07 1995-09-07 Construction method of re-prestressed steel-concrete composite beam

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KR1019950029343A KR100244084B1 (en) 1995-09-07 1995-09-07 Construction method of re-prestressed steel-concrete composite beam

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100310301B1 (en) * 1998-12-23 2001-12-17 하진규 Leaf-restrest box girder composite bridge
KR100439470B1 (en) * 2001-11-19 2004-07-09 신성건설 주식회사 Beam for Bridge

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010036486A (en) * 1999-10-08 2001-05-07 박상일 Method for designing and fabricating multi-step tension prestressed girder
KR100442722B1 (en) * 2001-08-08 2004-08-02 (주)스틸엔콘크리트 Pre-flexed beam and manufacturing method thereof
KR100541162B1 (en) * 2003-05-12 2006-01-11 주식회사 노빌테크 Composite Beam Stiffened with Prestressed Concrete Panel Having Embedded Lower Flange and Constructing Method thereof
WO2006065085A1 (en) * 2004-12-15 2006-06-22 Research Institute Of Industrial Science & Technology Manufacturing method for prestressed steel composite girder and prestressed steel composite girder thereby
KR100982668B1 (en) 2007-12-21 2010-09-17 재단법인 포항산업과학연구원 Method for manufacturing prestressed concrete girder
KR101298776B1 (en) 2010-09-09 2013-08-22 주식회사 이산 Method for Manufacturing Precast Prestressed Steel Concrete Composite Girder and Slab

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100310301B1 (en) * 1998-12-23 2001-12-17 하진규 Leaf-restrest box girder composite bridge
KR100439470B1 (en) * 2001-11-19 2004-07-09 신성건설 주식회사 Beam for Bridge

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