悬索桥鞍座处CFRP主缆抗弯性能研究
|
摘要
首先通过对鞍座处CFRP丝的力学性能分析,建立了CFRP丝弯曲强度计算理论,利用理论公式分析了CFRP丝直径和弯曲半径对弯曲强度的影响,并对CFRP丝临界弯曲半径作出推算;接着对CFRP丝在鞍座处的抗弯性能进行了模型试验研究,实测了3种弯曲半径对应的弯曲极限拉力;最后对理论分析结果和试验实测结果作了对比。研究结果表明:CFRP丝在大跨悬索桥鞍座处的弯曲张拉效率超过90%;CFRP主缆弯曲强度计算值与实测值吻合较好;当弯曲半径一定时,弯曲强度随着CFRP丝直径的增大而线性减少,当CFRP丝直径一定时,弯曲强度随着弯曲半径的增大而非线性增加,CFRP丝临界弯曲半径随着CFRP丝直径的增大而线性增加;CFRP丝在鞍槽上的包角对弯曲极限拉力没有影响。
Firstly,the bending strength theory of carbon fiber reinforced plastic(CFRP) wire was founded through analyzing the mechanical behaviors of CFRP wire in saddle,and influences of CFRP wire diameter and bending radius on bending strength were studied by theoretical formula.Then,the critical bending radius of CFRP wire was calculated,bending performance of CFRP wire in saddle was studied,the ultimate bending tensions with three kinds of bending radii were measured.Finally,the theoretical analysis results and test results were compared.The results show that the bending tensile efficiency of CFRP wire in saddle of long-span suspension bridge is more than 90%.Calculated values of bending strength of CFRP wire agree well with test values.If the bending radius is fixed,the bending strength decreases with the increase of diameter of CFRP wire,and the decreasing tendency presents linear.If the diameter of CFRP wire is fixed,the bending strength increases with the bending radius,and the increasing tendency presents non-linear.The critical bending radius of CFRP wire increases with the diameter of CFRP wire,and the increasing tendency presents linear,the bending angle of CFRP wire has no influence on ultimate bending tensile.
Firstly,the bending strength theory of carbon fiber reinforced plastic(CFRP) wire was founded through analyzing the mechanical behaviors of CFRP wire in saddle,and influences of CFRP wire diameter and bending radius on bending strength were studied by theoretical formula.Then,the critical bending radius of CFRP wire was calculated,bending performance of CFRP wire in saddle was studied,the ultimate bending tensions with three kinds of bending radii were measured.Finally,the theoretical analysis results and test results were compared.The results show that the bending tensile efficiency of CFRP wire in saddle of long-span suspension bridge is more than 90%.Calculated values of bending strength of CFRP wire agree well with test values.If the bending radius is fixed,the bending strength decreases with the increase of diameter of CFRP wire,and the decreasing tendency presents linear.If the diameter of CFRP wire is fixed,the bending strength increases with the bending radius,and the increasing tendency presents non-linear.The critical bending radius of CFRP wire increases with the diameter of CFRP wire,and the increasing tendency presents linear,the bending angle of CFRP wire has no influence on ultimate bending tensile.
引文
[1]吕志涛.高性能材料FRP应用与结构工程创新[J].建筑科学与工程学报,2005,22(1):1-5.LU Zhi-tao.Application of High Performance FRPand Innovations of Structure Engineering[J].Journalof Architecture and Civil Engineering,2005,22(1):1-5.
[2]吕志涛.高速铁路桥梁建设中的结构问题[J].建筑科学与工程学报,2006,23(3):1-6.LU Zhi-tao.Structural Problems in High-speed Rail-way Bridge Construction[J].Journal of Architectureand Civil Engineering,2006,23(3):1-6.
[3]周士金,刘荣桂,蔡东升,等.CFRP索和钢索斜拉桥地震响应分析与抗震验算[J].建筑科学与工程学报,2009,26(3):76-81.ZHOU Shi-jin,LIU Rong-gui,CAI Dong-sheng,et al.Cable-stayed Bridges with CFRP Cables and SteelCables[J].Journal of Architecture and Civil Engin-eering,2009,26(3):76-81.
[4]宿莹,吴智敏,胡程鹤,等.CFRP布加固钢筋混凝土梁的新型复合粘结技术[J].建筑科学与工程学报,2009,26(4):66-72.SU Ying,WU Zhi-min,HU Cheng-he,et al.New Hy-brid Bonding Technique of Reinforced Concrete BeamsStrengthened with CFRP Sheet[J].Journal of Archi-tecture and Civil Engineering,2009,26(4):66-72.
[5]ACI 440.1R-06,Guide for the Design and Construc-tion of Structural Concrete Reinforced with FRP Bars[S].
[6]ASTM D4476-69,Standard Test Method for FlexuralProperties of Fiber-reinforced Pultruded Plastic Rods[S].
[7]ASTM D790-10,Standard Test Methods for FlexuralProperties of Unreinforced and Reinforced Plasticsand Electrical Insulating Materials[S].
[8]ZHANG B,RADHOUANE M,BRAHIM B.NewMethod for Testing Fiber-reinforced Polymer RodsUnder Flexure[J].Journal of Testing and Evaluation,2006,35(2):171-176.
[9]ACI 440.3R-04,Guide Test Methods for Fiber-rein-forced Polymers(FRPs)for Reinforcing or Strength-ening Concrete Structures[S].
[10]朱虹.新型FRP筋预应力混凝土结构的研究[D].南京:东南大学,2004.ZHU Hong.Study on Concrete Structure Prestressedwith FRP Tendons[D].Nanjing:Southeast Univer-sity,2004.
[11]王新宇,刘立新,刘家慧.钢绞线弯折摩擦损失和弯折抗拉强度的试验研究[J].公路交通科技,2010(7):228-230.WANG Xin-yu,LIU Li-xin,LIU Jia-hui.Steel StrandBending Friction Loss and Bending Tensile StrengthTest Research[J].Journal of Highway and Transpor-tation Research and Development,2010(7):228-230.
[12]陈小兵.高性能纤维复合材料土木工程应用技术指南[M].北京:中国建筑工业出版社,2009.CHEN Xiao-bing.The Application Technology Guideof High-performance Fiber Reinforced Plastics inCivil Engineering[M].Beijing:China Architecture&Building Press,2009.
[13]JSCE-E 531-1995,Test Method for Tensile Propertiesof Continuous Fiber Reinforcing Materials[S].
[2]吕志涛.高速铁路桥梁建设中的结构问题[J].建筑科学与工程学报,2006,23(3):1-6.LU Zhi-tao.Structural Problems in High-speed Rail-way Bridge Construction[J].Journal of Architectureand Civil Engineering,2006,23(3):1-6.
[3]周士金,刘荣桂,蔡东升,等.CFRP索和钢索斜拉桥地震响应分析与抗震验算[J].建筑科学与工程学报,2009,26(3):76-81.ZHOU Shi-jin,LIU Rong-gui,CAI Dong-sheng,et al.Cable-stayed Bridges with CFRP Cables and SteelCables[J].Journal of Architecture and Civil Engin-eering,2009,26(3):76-81.
[4]宿莹,吴智敏,胡程鹤,等.CFRP布加固钢筋混凝土梁的新型复合粘结技术[J].建筑科学与工程学报,2009,26(4):66-72.SU Ying,WU Zhi-min,HU Cheng-he,et al.New Hy-brid Bonding Technique of Reinforced Concrete BeamsStrengthened with CFRP Sheet[J].Journal of Archi-tecture and Civil Engineering,2009,26(4):66-72.
[5]ACI 440.1R-06,Guide for the Design and Construc-tion of Structural Concrete Reinforced with FRP Bars[S].
[6]ASTM D4476-69,Standard Test Method for FlexuralProperties of Fiber-reinforced Pultruded Plastic Rods[S].
[7]ASTM D790-10,Standard Test Methods for FlexuralProperties of Unreinforced and Reinforced Plasticsand Electrical Insulating Materials[S].
[8]ZHANG B,RADHOUANE M,BRAHIM B.NewMethod for Testing Fiber-reinforced Polymer RodsUnder Flexure[J].Journal of Testing and Evaluation,2006,35(2):171-176.
[9]ACI 440.3R-04,Guide Test Methods for Fiber-rein-forced Polymers(FRPs)for Reinforcing or Strength-ening Concrete Structures[S].
[10]朱虹.新型FRP筋预应力混凝土结构的研究[D].南京:东南大学,2004.ZHU Hong.Study on Concrete Structure Prestressedwith FRP Tendons[D].Nanjing:Southeast Univer-sity,2004.
[11]王新宇,刘立新,刘家慧.钢绞线弯折摩擦损失和弯折抗拉强度的试验研究[J].公路交通科技,2010(7):228-230.WANG Xin-yu,LIU Li-xin,LIU Jia-hui.Steel StrandBending Friction Loss and Bending Tensile StrengthTest Research[J].Journal of Highway and Transpor-tation Research and Development,2010(7):228-230.
[12]陈小兵.高性能纤维复合材料土木工程应用技术指南[M].北京:中国建筑工业出版社,2009.CHEN Xiao-bing.The Application Technology Guideof High-performance Fiber Reinforced Plastics inCivil Engineering[M].Beijing:China Architecture&Building Press,2009.
[13]JSCE-E 531-1995,Test Method for Tensile Propertiesof Continuous Fiber Reinforcing Materials[S].
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心