斜拉桥双边工字钢-UHPC桥面板组合梁静力性能研究
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摘要
针对斜拉桥传统钢-混组合梁的不足,提出双边工字钢-UHPC桥面板组合梁。以湖南马路口资水大桥为依托,分别采用有限元软件MIDAS和ANSYS建立全桥模型和主梁节段模型,分析组合梁的受力性能,制作UHPC桥面板模型试件进行弯曲试验,研究UHPC桥面板的受力性能。结果表明:荷载组合作用下,钢主纵梁、钢横梁的最大正应力分别为223 MPa、197MPa,最大剪应力分别为145MPa、65MPa,小于钢材强度设计值;顺桥向、横桥向弯曲构件破坏时的名义拉应力分别为63.2MPa、34.5MPa,初裂应力分别为23.2MPa、10.4MPa,UHPC桥面板的抗弯承载能力满足要求,且具有良好的抗裂性能。
In view of the shortcomings of traditional steel-concrete composite girders of cablestayed bridges,we proposed a composite girder which is composed of twin I-steel and ultra-high performance concrete(UHPC)bridge deck.Based on Malukou Zishui Bridge in Hunan Province,a whole bridge model and a segment model of the main girder were established by using the finite element software such as MIDAS and ANSYS.The mechanical properties of the composite girder were analyzed,and the bending test of the UHPC bridge deck model was carried out to study the mechanical properties of the UHPC bridge deck.The results show that the maximum normal stresses of the main longitudinal girder and the cross beam of steel are 223 MPa and 197 MPa,respectively,under the combination action of load;the maximum shear stresses are 145 MPa and 65 MPa,respectively,which are less than the design values of steel strength.The nominal tensile stresses of the bending test component in bridge direction and transverse direction are 63.2 MPa and 34.5 MPa,respectively,and the initial crack stresses are 23.2 MPa and 10.4 MPa,respectively.The bending capacity of UHPC bridge deck meets the requirements and has good crack resistance.
In view of the shortcomings of traditional steel-concrete composite girders of cablestayed bridges,we proposed a composite girder which is composed of twin I-steel and ultra-high performance concrete(UHPC)bridge deck.Based on Malukou Zishui Bridge in Hunan Province,a whole bridge model and a segment model of the main girder were established by using the finite element software such as MIDAS and ANSYS.The mechanical properties of the composite girder were analyzed,and the bending test of the UHPC bridge deck model was carried out to study the mechanical properties of the UHPC bridge deck.The results show that the maximum normal stresses of the main longitudinal girder and the cross beam of steel are 223 MPa and 197 MPa,respectively,under the combination action of load;the maximum shear stresses are 145 MPa and 65 MPa,respectively,which are less than the design values of steel strength.The nominal tensile stresses of the bending test component in bridge direction and transverse direction are 63.2 MPa and 34.5 MPa,respectively,and the initial crack stresses are 23.2 MPa and 10.4 MPa,respectively.The bending capacity of UHPC bridge deck meets the requirements and has good crack resistance.
引文
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[2]宋冰泉,王晓阳,刘晟.清水浦大桥钢-混组合梁混凝土桥面板防裂技术[J].世界桥梁,2013,41(4):26-29,34.(SONG Bing-quan,WANG Xiao-yang,LIU Sheng.Cracking Control Technique for Concrete Slab of SteelConcrete Composite Girder of Qingshuipu Bridge[J].World Bridges,2013,41(4):26-29,34.in Chinese)
[3]湖南省交通规划勘察设计院有限公司.G59湖南省官新高速马路口资水大桥设计图纸[R].长沙:2017.(Hunan Traffic Planning Survey and Design Institute Co.,Ltd.Design Drawings of Malukou Bridge Crossing Zishui River in Hunan[R].Changsha:2017.in Chinese)
[4]邵旭东,吴佳佳,刘榕,等.钢-UHPC轻型组合桥梁结构华夫桥面板的基本性能[J].中国公路学报,2017,30(3):218-225,245.(SHAO Xu-dong,WU Jia-jia,LIU Rong,et al.Basic Performance of Waffle Deck Panel of Lightweight Steel-UHPC Composite Bridge[J].China Journal of Highway and Transport,2017,30(3):218-225,245.in Chinese)
[5]李嘉,冯啸天,邵旭东,等.STC钢桥面铺装新体系的力学计算与实桥试验对比分析[J].中国公路学报,2014,27(3):39-44,50.(LI Jia,FENG Xiao-tian,SHAO Xu-dong,et al.Comparison of Mechanical Calculation and Actual Test for New STC Steel Bridge Paving System[J].China Journal of Highway and Transport,2014,27(3):39-44,50.in Chinese)
[6]张欣,刘榕.株洲市枫溪大桥的设计与关键技术研究[J].中外公路,2017,37(2):102-104.(ZHANG Xin,LIU Rong.Design and Study on Key Techniques of Fengxi Bridge in Zhuzhou[J].Journal of China&Foreign Highway,2017,37(2):102-104.in Chinese)
[7]JTG 3362-2018,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].(JTG 3362-2018,Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts[S].)
[8]JTG D64-2015,公路钢结构桥梁设计规范[S].(JTG D64-2015,Code for Design of Highway Steel Bridges[S].)
[9]JTG D60-2015,公路桥涵设计通用规范[S].(JTG D60-2015,General Code for Design of Highway Bridges and Culverts[S].)
[10]Rafiee A.Computer Modeling and Investigation on the Steel Corrosion in Cracked Ultra High Performance Concrete[M].Kassel:Kassel University Press,2012.