不同连接程度GFRP-混凝土桥面板力学性能试验研究
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摘要
提出了一种简便的改进GFRP-混凝土组合板连接程度并进一步改进组合板延性的方法,即通过砾石覆盖率来改变GFRP-混凝土界面的黏结强度,并利用界面黏结失效前后组合板连接机理的变化来改变组合板的弯曲刚度,进一步改变组合板的延性.通过5片足尺T形GFRP-混凝土组合板四点弯曲试验研究了不同连接程度下组合板受力性能的差异.试验中,重点关注了变形、板端滑移、应变分布、破坏模式等力学参量.试验结果表明,尽管无黏结T形GFRP板与混凝土的界面光滑,但GFRP板与混凝土间已表现出部分组合作用.砾石覆盖率的变化可以改变组合板的连接程度、破坏模式、极限荷载及其延性.合理的砾石覆盖率可以使组合板在板端出现滑移前具有很好的抗弯刚度,在出现板端滑移后仍具有较好的变形能力,并且不会显著降低组合板的极限荷载.最后,通过理论方法对组合板的开裂荷载和抗剪承载力进行了计算分析.研究结果表明,理论值与试验值吻合较好.
This paper presented a simple method to improve the connection degree of GFRP-concrete composite decks and further improved the ductility of the composite decks.The connection strength of GFRP-concrete interface was changed by using different gravel coverage. The bending stiffness was significantly changed due to the connection mechanism change after the GFRP-concrete interface failed,and the ductility was also further improved.Five full-size T-shape GFRP-concrete composite decks were tested to explore the difference of the mechanical properties of composite decks with different connection degree.In the experiment results,deformation,slip at the end of decks,strain distribution and failure modes were mainly examined. The experimental results show that although the GFRP-concrete interface of the specimen with unbonded interface is smooth,partial composite action between GFRP plate and concrete can be observed.A variable gravel coverage changed the failure mode,ultimate load,connection degree and ductility. A reasonable gravel coverage can provide an effective composite action before slip at the end of decks occurs,offer a large deformation after slip occurs,and not significantly reduce the ultimate load. At last, the consistency of theoretical results with experimental results demonstrates that the cracking load and shear capacity can be predicted by using the methods in the paper.
This paper presented a simple method to improve the connection degree of GFRP-concrete composite decks and further improved the ductility of the composite decks.The connection strength of GFRP-concrete interface was changed by using different gravel coverage. The bending stiffness was significantly changed due to the connection mechanism change after the GFRP-concrete interface failed,and the ductility was also further improved.Five full-size T-shape GFRP-concrete composite decks were tested to explore the difference of the mechanical properties of composite decks with different connection degree.In the experiment results,deformation,slip at the end of decks,strain distribution and failure modes were mainly examined. The experimental results show that although the GFRP-concrete interface of the specimen with unbonded interface is smooth,partial composite action between GFRP plate and concrete can be observed.A variable gravel coverage changed the failure mode,ultimate load,connection degree and ductility. A reasonable gravel coverage can provide an effective composite action before slip at the end of decks occurs,offer a large deformation after slip occurs,and not significantly reduce the ultimate load. At last, the consistency of theoretical results with experimental results demonstrates that the cracking load and shear capacity can be predicted by using the methods in the paper.
引文
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[2]卫军,张萌,董荣珍,等.钢筋锈蚀对混凝土梁破坏模式影响的试验研究[J].湖南大学学报(自然科学版),2013,40(10):15—21.WEI J,ZHANG M,DONG R Z,et al. Experimental research on the failure mode of concrete beam due to steel corrosion[J]. Journal of Hunan University(Natural Sciences),2013,40(10):15—21.(In Chinese)
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[5]佟兆杰,黄侨,鲍卫刚,等.GFRP-混凝土组合连续板的静力性能试验研究[J].华南理工大学学报(自然科学版),2017,45(11):31—40.TONG Z J,HUANG Q,BAO W G,et al. Experimental investigation into static behavior of GFRP-concrete continuous deck[J]. Journal of South China University of Technology(Natural Sciences),2017,45(11):31—40.(In Chinese)
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[7]郭诗惠,蔡春声,张建仁,等.界面优化下的GFRP-混凝土组合桥面板静力性能试验研究[J].湖南大学学报(自然科学版),2017,44(3):19-27.GUO S H,CAI C S,ZHANG J R,et al. Static experimental study on performance of GFRP-concrete composite bridge deck with an optimized interface[J]. Journal of Hunan University(Natural Sciences),2017,44(3):19-27.(In Chinese)
[8]ZOU X X,FENG P,WANG J Q. Perforated FRP ribs for shear connecting of FRP-concrete hybrid beams/decks[J]. Composite Structures,2016,152:267-276.
[9]ZHANG L,WANG W W,HARRIES K A,et al. Bonding behavior of wet-bonded GFRP-concrete interface[J]. Journal of Composites for Construction,2015,19(6):04015001.
[10]HALL J E,MOTTRAM J T. Combined FRP reinforcement and permanent formwork for concrete members[J]. Journal of Composites for Construction,1998,2(2):78-86.
[11]FAM A,NELSON M. New bridge deck cast onto corrugated GFRP stay-in-place structural forms with interlocking connections[J].Journal of Composites for Construction,2012,16(1):110-117.
[12]CHO K,PARK S Y,KIM S T,et al. Behavioral characteristics of precast FRP-concrete composite deck subjected to combined axial and flexural loads[J]. Composites Part B:Engineering,2013,44(1):679-685.
[13]NELSON M,FAM A. Structural GFRP permanent forms with Tshape ribs for bridge decks supported by precast concrete girders[J]. Journal of Bridge Engineering,2013,18(9):813-826.
[14]HE J,LIU Y Q,CHEN A R,et al. Experimental investigation of movable hybrid GFRP and concrete bridge deck[D]. Construction and Building Materials,2012,26(1):49-64.
[15]BANK L C,OLIVA M G.BAE H,et al. Pultruded FRP plank as formwork and reinforcement for concrete members[J]. Advances in Structural Engineering,2007,10(5):525-535.
[16]HONICKMAN H,NELSON M,FAM A. Investigation into the bond of glass fiber-reinforced polymer stay-in-place structural forms to concrete for decking applications[J]. Journal of the Transporta-tion Research Board,2009,2131(1):134-144.
[17]黄侨,佟兆杰.带翼缘槽型FRP板材-混凝土组合桥面板:CN104652267B[P]. 2016-08-17.HUANG Q,TONG Z J. Flanged groove type FRP(Fiber Reinforce Plastic)plate-concrete combination bridge deck:CN104652267B[P]. 2016-08-17.(In Chinese)
[18]AKBARZADEH H,MAGHSOUDI A A. Experimental and analytical investigation of reinforced high strength concrete continuous beams strengthened with fiber reinforced polymer[J]. Materials and design,2010,31(3):1130-1147.
[19]MAGHSOUDI A A,BENGAR H A. Flexural ductility of HSC members[J]. Structural Engineering and Mechanics,2006,24(2):195-212.
[20]ACI 440. 1R—2015 Guide for the design and construction of structural concrete reinforced with FRP bars[S]. Farmington Hills:American Concrete Institute,2015:23.
[21]陈卓异.波形钢腹板组合槽型梁桥的力学性能与试验研究[D].南京:东南大学交通学院,2014:58.CHEN Z Y. Study and test on mechanical properties of composite trough girder with corrugated steel webs[D]. Nanjing:School of Transportation,Southeast University,2014:58.(In Chinese)
[22]张晓亮,屈文俊.无腹筋GFRP筋混凝土梁抗剪性能试验[J].中国公路学报,2010,23(5):51-57.ZHANG X L,QU W J. Shear behavior test of GFRP-reinforced concrete beams without stirrups[J]. China Journal of Highway and Transport,2010,23(5):51-57.(In Chinese)
[23]RAZAQPUR A G. Proposed shear design method for FRP-reinforced concrete members without stirrups[J]. ACI Structural Journal,2006,103(1):93-102.
[24]JTJ D62—2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004:30.JTJ D62—2004Code for design of highway reinforced concrete and prestressed concrete bridges and culverts[S]. Beijing:China Communication Press,2004:30.(In Chinese)
[2]卫军,张萌,董荣珍,等.钢筋锈蚀对混凝土梁破坏模式影响的试验研究[J].湖南大学学报(自然科学版),2013,40(10):15—21.WEI J,ZHANG M,DONG R Z,et al. Experimental research on the failure mode of concrete beam due to steel corrosion[J]. Journal of Hunan University(Natural Sciences),2013,40(10):15—21.(In Chinese)
[3]ZUO Y,LIU Y Q,HE J. Experimental investigation on hybrid GFRP-concrete decks with T-shaped perforated ribs subjected to negative moment[J]. Construction and Building Materials,2018,158:728—741.
[4]NELSON M,FAM A. Full bridge testing at scale constructed with novel FRP stay-in-place structural forms for concrete deck[J].Construction and Building Materials,2014,50(2):368—376.
[5]佟兆杰,黄侨,鲍卫刚,等.GFRP-混凝土组合连续板的静力性能试验研究[J].华南理工大学学报(自然科学版),2017,45(11):31—40.TONG Z J,HUANG Q,BAO W G,et al. Experimental investigation into static behavior of GFRP-concrete continuous deck[J]. Journal of South China University of Technology(Natural Sciences),2017,45(11):31—40.(In Chinese)
[6]ZHANG P,ZHU H,WU G,et al. Shear capacity comparison of four different composite interfaces between FRP plates and concrete substrate[J]. Journal of Composites for Construction,2016,20(4):04016006.
[7]郭诗惠,蔡春声,张建仁,等.界面优化下的GFRP-混凝土组合桥面板静力性能试验研究[J].湖南大学学报(自然科学版),2017,44(3):19-27.GUO S H,CAI C S,ZHANG J R,et al. Static experimental study on performance of GFRP-concrete composite bridge deck with an optimized interface[J]. Journal of Hunan University(Natural Sciences),2017,44(3):19-27.(In Chinese)
[8]ZOU X X,FENG P,WANG J Q. Perforated FRP ribs for shear connecting of FRP-concrete hybrid beams/decks[J]. Composite Structures,2016,152:267-276.
[9]ZHANG L,WANG W W,HARRIES K A,et al. Bonding behavior of wet-bonded GFRP-concrete interface[J]. Journal of Composites for Construction,2015,19(6):04015001.
[10]HALL J E,MOTTRAM J T. Combined FRP reinforcement and permanent formwork for concrete members[J]. Journal of Composites for Construction,1998,2(2):78-86.
[11]FAM A,NELSON M. New bridge deck cast onto corrugated GFRP stay-in-place structural forms with interlocking connections[J].Journal of Composites for Construction,2012,16(1):110-117.
[12]CHO K,PARK S Y,KIM S T,et al. Behavioral characteristics of precast FRP-concrete composite deck subjected to combined axial and flexural loads[J]. Composites Part B:Engineering,2013,44(1):679-685.
[13]NELSON M,FAM A. Structural GFRP permanent forms with Tshape ribs for bridge decks supported by precast concrete girders[J]. Journal of Bridge Engineering,2013,18(9):813-826.
[14]HE J,LIU Y Q,CHEN A R,et al. Experimental investigation of movable hybrid GFRP and concrete bridge deck[D]. Construction and Building Materials,2012,26(1):49-64.
[15]BANK L C,OLIVA M G.BAE H,et al. Pultruded FRP plank as formwork and reinforcement for concrete members[J]. Advances in Structural Engineering,2007,10(5):525-535.
[16]HONICKMAN H,NELSON M,FAM A. Investigation into the bond of glass fiber-reinforced polymer stay-in-place structural forms to concrete for decking applications[J]. Journal of the Transporta-tion Research Board,2009,2131(1):134-144.
[17]黄侨,佟兆杰.带翼缘槽型FRP板材-混凝土组合桥面板:CN104652267B[P]. 2016-08-17.HUANG Q,TONG Z J. Flanged groove type FRP(Fiber Reinforce Plastic)plate-concrete combination bridge deck:CN104652267B[P]. 2016-08-17.(In Chinese)
[18]AKBARZADEH H,MAGHSOUDI A A. Experimental and analytical investigation of reinforced high strength concrete continuous beams strengthened with fiber reinforced polymer[J]. Materials and design,2010,31(3):1130-1147.
[19]MAGHSOUDI A A,BENGAR H A. Flexural ductility of HSC members[J]. Structural Engineering and Mechanics,2006,24(2):195-212.
[20]ACI 440. 1R—2015 Guide for the design and construction of structural concrete reinforced with FRP bars[S]. Farmington Hills:American Concrete Institute,2015:23.
[21]陈卓异.波形钢腹板组合槽型梁桥的力学性能与试验研究[D].南京:东南大学交通学院,2014:58.CHEN Z Y. Study and test on mechanical properties of composite trough girder with corrugated steel webs[D]. Nanjing:School of Transportation,Southeast University,2014:58.(In Chinese)
[22]张晓亮,屈文俊.无腹筋GFRP筋混凝土梁抗剪性能试验[J].中国公路学报,2010,23(5):51-57.ZHANG X L,QU W J. Shear behavior test of GFRP-reinforced concrete beams without stirrups[J]. China Journal of Highway and Transport,2010,23(5):51-57.(In Chinese)
[23]RAZAQPUR A G. Proposed shear design method for FRP-reinforced concrete members without stirrups[J]. ACI Structural Journal,2006,103(1):93-102.
[24]JTJ D62—2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004:30.JTJ D62—2004Code for design of highway reinforced concrete and prestressed concrete bridges and culverts[S]. Beijing:China Communication Press,2004:30.(In Chinese)
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