frp筋高韧性水泥基材料复合加固混凝土桥梁技术及服役性能-改eng o

1、广西交通科学研究院浙江大学Guangxi Transportation Research InsituteZHEJIANG UNIVERSITY2022年8月29日FRP筋高韧性水泥基材料复合加固混凝土桥梁技术及服役性能The Technology and Service Performance for Concrete Bridge Strengthening Using FRP Rebar & Ultra High Toughness Cementitious Composites (UHTCC)2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 Th

2、e mechanical performance of UHTCC FRP筋的性能 The performance of FRP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC F

3、RP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengthening using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 Conclusion2022年8月29日2006、2007两年危桥的数量

4、及其所占比例均有大幅上升。The number and proportion of deficient bridges increased in 2006 and 2007背景及意义 Background & Purpose为解决桥梁的耐久性问题，需要采取什么样方法来改善危桥数量不断攀升的现象？What is necessary to decrease the No. of deficient bridges and to solve the durability problem?No. of Deficient BridgesNo. of Deficient Bridges开裂、钢筋锈蚀是钢

5、筋混凝土桥梁耐久性蜕化、结构刚度和承载能力降低的主要诱因。 Cracks and corrosion are the main cause of the decreasing of durability, stiffness and strength of the structure.2022年8月29日背景及意义 Background & Purpose2022年8月29日现有一些桥梁加固方案不太注重裂缝的主动控制和耐久性要求，使得桥梁的服役寿命难以达到理想的效果。因此，一个优秀的桥梁加固方案的确定，既要考虑新的加固是否能有效地提高桥梁的承载能力和整体性而不影响桥梁原有的使用功能，还要考虑此

6、方案是否能很好的改善桥梁存在的耐久性问题而不再出现或者大大减轻各种病害。The current bridge strenthening method does not pay much attention to the cracks active control and durability requirements. That is why bridges usually cannot serve as long as we expect. Therefore, a good bridge strengthening needs think about whether it can impr

7、ove the bridge capacity and integrity, and has no effect on bridges original function. Whether the methods can improve the durability well and reduce the No. of deficiency is also important.为确保桥梁结构具有足够的安全性和可靠性，除了要在结构设计上继续下功夫外，也必然对混凝土与加固材料提出新的更高的要求，除了有较好的耐久性、较高的强度之外，还应具备优良的延性、有效控制裂缝的能力和与加固结构有良好的相容性。

8、To guarantee the safety and reliability of bridge structure, to set a higher requirement for strengthening material is as critical as good design. Besides good durability and strength, material should have excellent ductility, ability to contral cracks and compatibility to the original material.背景及意

9、义 Background & Purpose2022年8月29日Deficient Stuff纤维聚合物筋Fiber Polyester Rebar工程水泥复合材料Engineering Cementitious Composites用纤维聚合物筋代替钢筋，解决了钢筋锈蚀问题。Replace steel with FRP to solve corrosion issue.用纤维增强水泥基复合材料代替混凝土，解决了混凝土易开裂的问题。Replace concrete with fiber-reinforced cementitious composites to solve crack issu

10、e. 纤维增强水泥基复合材料与纤维筋结合，能够更好的抑制裂缝发展，提高结构的耐久性。Combination of FRP rebar and fiber-reinforced cementitious composites restrains crack developing and improve structure durability. 对策及本技术主要思路2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance of FRP rebar

11、s 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengthening usin

12、g FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 ConclusionFRP筋的性能2022年8月29日高韧性水泥基复合材料 (可弥补FRP筋的不足)UHTCC and FRP rebars are complementaryFRP筋FRP rebar抗拉强度高

13、 High tensive capacity密度小、质量轻 Low density, light weight弹性模量低，延性差 Low modulus of elasticity抗剪强度差 Low shear capacity抗拉强度较低 Low tensive capacity密度大，质量重 High density, Heavy weight延性好，变形大 Good ductility, large deformation抗剪强度较好 Good shear capacityFRP筋与ECC结合运用到结构中 Use the combine FRP rebars and ECC耐腐蚀 Cor

14、rosion resisitance抗疲劳 Fatigue resistance电磁绝缘性好 Electromagnetic insulation2022年8月29日直接拉伸试验 Direct Drawing TestLoadLoadCFRP wrappingLoadLoadAluminum plateglueEpoxy resinCFRP wrappingEpoxy resin2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance of F

15、RP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengthen

16、ing using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 Conclusion应力-应变曲线 Stress-Strain curve(b) E-1(a) C-0(c) E-2(d) E-3(e) E-4(f) E-52022年8月29日表2-2 拉伸试验

17、结果 Result of stretch test在纤维体积掺量为2.0%左右的情况下，掺入粉煤灰、硅灰、偏高岭土的纤维增强水泥基复合材料其极限拉应变能达到2%，极限拉应力达到4.0MPa。 When volume of fiber is around 2.0%, the tensive strain limit of UHTCC(with fly ash, silica fume, high ridge soil) reaches 2%, tensive stress limit reaches 4.0MPa.呈现出高延性，并表现出明显的应变-硬化及多裂缝开裂特性，且最大裂缝宽度不超过175

18、微米 ，平均裂缝宽度不超过115 微米。High ductility, evident strain-hardening characteristic and multiple cracks. The largest width of cracks is 175 micrometer, the average width is less than 115 micrometer.2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance of FR

19、P rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengtheni

20、ng using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 ConclusionFRP筋与高韧性混凝土的粘结性能Bonding Performance between FRP rebars and cementitious composites 2022年8

21、月29日试件编号Piece number基体类别Material category纤维筋直径dia. Of fiber rebar/mm试件尺寸Size/mm保护层厚度Thickness of cover/mm锚固长度Anchorage length/mm试件个数Amount of piecesE150-16-80ECC 16150*150*1506780（5D）3E150-10-50ECC10150*150*1507050（5D）3E150-04-20ECC4150*150*1507320（5D）3E100-04-20ECC 4100*100*1504820（5D）3E100-04-4040

22、（10D）3E100-04-6060（15D）3E50-04-20ECC 4100*50*1502320（5D）3E15-04-10ECC 4100*15*150610（2.5D）3E15-04-2020（5D）3E15-04-4040（10D）3C100-04-20纯水泥基材料4100*100*1504820（5D）3C50-04-20纯水泥基材料4100*50*1502520（5D）3C15-04-20纯水泥基材料4100*15*150620（5D）3 拉拔试件明细表 Detail of test pieces for drawing test 2022年8月29日粘结拉拔试件Bond d

23、rawing test-piece试验装置Test equipmentBFRP rebarPVC TUBEECCdiameter2022年8月29日(a) E150-16-80(b) E150-10-50(c) E100-04-20(d) E50-04-20(e) C100-04-20(f) C50-04-20Bond slide curve Forced end Free end2022年8月29日1.FRP筋直径对粘结强度的影响Bond capacity with different diamiter of FRP rebars2.基材性能对粘结强度的影响 Bond with differ

24、ent Material performance 3.保护层厚度对粘结强度的影响 Bond capacity and cover depthc/d 1.5时，易发生劈裂破坏。 when c/d 1.5, easily splitting BFRP筋与ECC的极限粘结强度相对于纯水泥基材料拉拔试件有所提高。The bond limit of BFRP and ECC is higher than pure cementitious material on drawing test The larger diameter, the lower bond(a) 不同直径BFRP筋与ECC的粘结强度

25、Bond capacity with different BFPR diameter(b) BFRP筋与不同基材的粘结强度 Bond capacity between BFRP and different materials由于纤维的约束作用，ECC即使开裂也不会失去了对FRP筋的约束作用，BFRP筋与ECC之间具有很好的粘结力。Due to constraint effect of fiber, ECC still bonds with FRP rebar even when it cracks. Bonding between BFRP and ECC is good.基本锚固长度 Bas

26、ic anchorage length2022年8月29日Diamiter of BFRP bars/mmJSCEACI440本文计算结果Result411.9 37.8 12.5 1012.5 37.8 13.1 1614.7 37.8 15.4 相对基本锚固长度（lab/d）结果比较Compared result of relative basic anchorage length 2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance

27、of FRP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder streng

28、thening using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 ConclusionFRP筋高韧性混凝土复合结构力学性能Mechanical Performance of FRP rebars and UHTCC 2022年8月29日类型 Type纤维

29、筋根数No. of Rebars板的尺寸Size of Plate普通水泥基薄板（不添加PVA纤维）+BFRP筋 Normal cementitious plate (with no PVA fiber) + BFRP rebars2400mm*100mm*15mm4ECC薄板+BFRP筋ECC plate + BFRP rebars234表4-1 BFRP筋增强纤维板 BFRP rebar reinforced plate2022年8月29日(a) C-B-2(b) C-B-4(c) E-B-2(d) E-B-3(e) E-B-4Stress-Strain Curve2022年8月29日板E

30、-B-2、E-B-3、E-B-4（相对于纯ECC薄板）Plate E-B-2, E-B-3, E-B-4 (Compared to pure ECC plate)极 限 荷 载 分 别 为：18.1KN，22.8KN，30.6KN，Load limit of each plate is 18.1KN, 22.8KN, 30.6KN极限承载力分别提高了：202%、280%、410%。Capacity limit increases 202%, 280% and 410%E-B系列：最大裂缝宽度在200微米 以内；E-B series, max width of cracks is 200m C-

31、B系列：最大裂缝宽度为800微米 左右。C-B series, max width of cracks is 800mE-B系列：平均裂缝宽度为100 微米左右；C-B系列：平均裂缝宽度为700微米 左右。E-B series, average width of cracks is 100m. For E-B series, it is 700m.2022年8月29日ECC开裂后能继续承担荷载的特性对板E-B-2的极限承载力的提高做出了较大的贡献。ECC can continually provide load capacity after it cracks, which largely i

32、mprove the capacity limit of E-B-2 plate.BFRP筋与ECC良好的粘结与变形协调能力对E-B-2板承载力的提高也做出了一定程度的贡献。 The good bonding and Co-deformation between BFRP rebars and ECC largely imprive the capacity limit of E-B-2 plate.2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The perfo

33、rmance of FRP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder

34、 strengthening using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 ConclusionFRP筋高韧性混凝土复合加固混凝土梁性能Performance of concrete girder strengthening using FRP re

35、bars and UHTCC2022年8月29日CFRP筋增强ECC板加固钢筋混凝土梁CFRP-reinforced-ECC-plate strengthened concrete girder1-1混凝土Concrete钢筋Steel rebarCFRP筋CFRP rebar碳纤维布CFRP WrappingECC与老混凝土的粘结性能 Bond performance between ECC and original concrete2022年8月29日既有混凝土Original ConcreteECC在同抗压强度下，界面处的破坏主要发生在既有混凝土中，因此ECC和既有结构混凝土有着良好的粘

36、结性能。With the same compressive capacity, the interface of failure mainly occurs at the original part of concrete. Therefore, bonding performance between ECC and original concrete is great.2022年8月29日编号No.加固层厚度Thickness of strengthened layer/mmCFRP筋根数 No. of CFRP rebarsCFRP筋直径/mm钢筋直径/mm梁的处理方式How to dea

37、l with girders截面尺寸 Size of cross-section/mmC-000814无 no150*200C-N20（水泥基Cement-based material）2814梁底凿毛，无铆钉（碳纤维布倒U形加固）Coarsen the bottom of girder, no Rivet(Inverted U-shape CFRP wrapping)150*200E-N20(ECC)2814梁底凿毛，无铆钉（碳纤维布倒U形加固）Coarsen the bottom of girder, no Rivet(Inverted U-shape CFRP wrapping) 150

38、*200E-U20(ECC)2814梁底凿毛、梁底设铆钉碳纤维布倒U形加固）Coarsen the bottom of girder, no Rivet at the bottom(Inverted U-shape CFRP wrapping)150*200E-N-M20(ECC)2814梁底凿毛，无铆钉（碳纤维布倒U形加固）Coarsen the bottom of girder, no Rivet(Inverted U-shape CFRP wrapping) 150*200E-U-M20(ECC)2814梁底凿毛、梁底设铆钉碳纤维布倒U形加固）Coarsen the bottom of

39、girder, no Rivet at the bottom(Inverted U-shape CFRP wrapping)150*200表6-1 CFRP筋增强ECC板加固混凝土梁 Table 6-1 CFRP-reinforced-ECC-plate strengthened concrete girder2022年8月29日2022年8月29日(a) 梁C-0(b) 梁C-N(c) 梁E-N(d) 梁E-N-M(e) 梁E-U(f) 梁E-U-M29试验结果-梁的破坏模式 Test result failure mode of girder2022年8月29日试验结果-荷载挠度曲线 Te

40、st result load-deflection curve 荷载挠度曲线 Load-deflection curve加固构件的开裂荷载约提高了：37.9%-60.9%；Crack load increases about by 37.9% - 60.9%;钢筋屈服时荷载分别提高了：58.2 %、45.4%、43.9%、51.0%、49.0%；Steel yielding load respectively increases by 58.2 %、45.4%、43.9%、51.0%、49.0%;极限承载能力分别提高了：43.5%、38.2%和 48.4%、109.1%、101.1%。 The

41、 limit capacity respectively increases by 43.5%、38.2%和 48.4%、109.1%、101.1%.钢筋屈服Steel bars yields混凝土开裂Concrete cracks钢筋屈服Steel bars yields混凝土开裂Concrete cracks2022年8月29日试验结果-裂缝发展(a) 梁C-0(b) 梁C-N(c) 梁E-N(d) 梁E-N-M(e) 梁E-U(f) 梁E-U-M1. 对 比 梁：加载初期，裂缝宽度发展较为缓慢，但加载到钢筋的屈服荷载后，裂缝的宽度迅速增加，很快达到2mm左右；1. Control gir

42、der: At the early stage of loading, width of cracks increases slowly. However, width of cracks grow fast after steel yields.2. E-N系列梁：随着荷载的增加，裂缝一直处于缓慢发展的状态，达到极 限荷载时，裂缝均小于0.5mm；2. For girders of E-N series, cracks grow slowly all the time during load increasing. The max width of creacks is smaller th

43、an 0.5mm when applied load reaches the capacity.3. E-U系列梁：加载初期，随着荷载增加，裂缝宽度缓慢增加，加载后期快接近极限荷载时，裂缝宽度增长趋势加快，临近破坏时， 宽度仍然低于1mm。3. For girders of E-N series: At the early stage of loading, width of cracks grow slowly. Width of cracks tends to grow faster when applied load is about to reach the capacity. The

44、 max width of cracks is still within 1mm when it is near the limit.312022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance of FRP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP reba

45、rs and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengthening using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Te

46、chnology of strengthening and restore社会经济效益分析 The social and economic benefit结论 ConclusionFRP筋高韧性混凝土复合加固设计理论Theory for desigh and strengthening using FRP rebars and UHTCC2022年8月29日FRP筋高韧性混凝土加固钢筋混凝土结构受力特征The mechanical performance of concrete structure with FRP rebars and UGTCC FRP筋高韧性混凝土加固混凝土结构设计与计算

47、基本原理Basic theory for desigh and computing using FRP rebars and UHTCC加固结构属二次受力结构。Strengthened structure is secondary forced structure.加固结构属组合结构，新旧两部分整体工作共同受力。Strengthened structure is composite structure, the old and new components are working simultaneously. 构件在结构加固后其抗弯性能符合平截面假定。 Components remains

48、to obey plane cross-section assumption after strengthening.基本假定 basic assumptions：截面上的应变保持平截面 strain on cross-section should obey plane cross-section assumption；截面上的混凝土不抵抗拉应力；concrete on cross-section has no tensive capacity;钢筋、混凝土应力应变本构关系采用混凝土设计规范的推荐模型；Stress-strain relationship of concrete reinfor

49、cement refers to the general concrete design code.ECC开裂后考虑受拉ECC的作用；极限承载力计算时应计入ECC的抗拉强度；ECC应力-应变关系采用相关的力学模型。The tensive capacity of ECC is counted after it cracks. ECCs tensive capacity should be counted when calculating limit capacity. Stress-strain relationtship refers to relative mechanical models

50、.FRP筋的应力-应变关系破坏之前保持为线性；受拉FRP筋的应力取等于FRP筋应变与弹性模量的乘积，但其绝对值不应大于其允许的抗拉强度设计值。Strain-stress relationship of FRP rebars is linear before failure. The stress of FRP rebars is the pruduct of FRPs stress and its modulus elasticity.2022年8月29日混凝土单轴受压应力-应变曲线Single axis compressive stress-strain curve of concrete受

51、拉钢筋应力-应变系曲线Tensive steel rebars stress-strain curve 高韧性混凝土单轴拉伸应力-应变关系曲线High toughness concrete single axistensive stress-strain curveFRP筋受拉应力-应变关系曲线Tensive FRP rebars stress-strain curve梁的破坏状态1钢筋屈服、FRP筋达到极限的同时混凝土被压碎： Girders failure mode 1 steel yields, FRP reaches its limit and concrete crashes at

52、the same time.2022年8月29日 梁的破坏状态2钢筋屈服、混凝土压碎、FRP筋未达到极限状态 Girders failure mode 2 steel yields and concrete crashes, but the FRP does not meet its limit.2022年8月29日梁的破坏状态3钢筋屈服、混凝土未压碎、FRP筋达到极限状态 Girders failure mode 3 steel yields, but concrete is well and FRP does not meet its limit2022年8月29日（a）混凝土应变2022

53、年8月29日（b）混凝土应变FRP筋混凝土结构承能力计算需采用合理的允许变形进行计算，对于本研究采用CFRP筋，其允许应变宜不大于0.4%。 The capacity calculation of FRP reinforced concrete structure needs to use reasonable allowed deformation. For the CFRP in this research, the allowed deformation should not be greater than 0.4%.梁的破坏状态3钢筋屈服、混凝土未压碎、FRP筋达到极限状态 Girde

54、rs failure mode 3 steel yields, but concrete is well and FRP does not meet its limit2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance of FRP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance b

55、etween FRP rebars and cementitious composites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengthening using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and

56、 UHTCC加固修复工艺 Technology of strengthening and restore社会经济效益分析 The social and economic benefit结论 Conclusion加固修复工艺Technology of strengthenging and restore2022年8月29日混凝土基面处理Preparing concrete surface基面浮尘处理cleaning dust高韧性混凝土压抹apply the UHTCC tightly绑扎碳纤维筋Tie CFRP rebars喷涂加固用界面剂Spray strengthening interfa

57、ce agent植入铆钉Plant rivet湿润养生Wetting and maintain 2022年8月29日目录 Table of contents高韧性水泥基复合材料力学性能 The mechanical performance of UHTCC FRP筋的性能 The performance of FRP rebars 背景与意义、对策与本技术主要思路 Background & purpose, options & main ideaFRP筋与水泥基复合材料的粘结性能 Bonding Performance between FRP rebars and cementitious c

58、omposites FRP筋高韧性水泥基材料复合结构力学性能 Mechanical performance of structure using FRP rebars and UHTCC FRP筋高韧性水泥基材料复合加固混凝土梁性能Performance of concrete girder strengthening using FRP rebars and UHTCCFRP筋高韧性水泥基材料复合加固设计理论 Theory for design and strengthening using FRP rebars and UHTCC加固修复工艺 Technology of strengthe

59、ning and restore社会经济效益分析 The social and economic benefit结论 Conclusion 社会经济效益分析Analysis on social and economic benifit 2022年8月29日1、经济效益分析Ecnomic benefit analysis 费用项目Cost粘贴CFRP加固 Apply CFRP粘钢加固Apply steel plate更换梁板Replace girderCFRP筋（8mm)ECC (25mm厚）复合加固直接费 direct cost（元RMB/m2）271492.3542.6327.5间接费用In

60、direct cost（元RMB/m2）40.773.881.433.6综合单价Comprehensive unit price(元RMB/m2）311.7566.1624361.1由于FRP筋与ECC材料有着很高的耐久性，且二者的复合结构也有着很强的裂缝控制能力，所以FRP筋ECC复合加固技术除了可以提高劣化桥梁结构的承载力外，更可以有效提升桥梁混凝土的抗裂性和加固后结构的耐久性，大大延长桥梁结构的服役寿命，减少桥梁的后期维护费用，从桥梁使用的全寿命出发，其带来的经济效益十分显著。Due to the high durability, and also because these two m