用碱矿渣胶凝材料粘贴CFRP布加固混凝土梁受力性能研究
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摘要
针对环氧类有机粘结胶软化点多介于60℃~80℃,难以保证粘贴碳纤维布加固混凝土结构的抗火要求的问题,我所在的课题组成功研制出耐火极限不低于600℃的碱激发矿渣无机胶凝材料(以下简称碱矿渣胶凝材料),这种无机胶凝材料的力学性能不低于环氧类有机胶。因此,研究用该碱矿渣胶凝材料粘贴碳纤维片材加固钢筋混凝土梁的受力性能具有一定的现实意义。
现行的《碳纤维片材加固修复混凝土结构技术规程》(CECS146:2003)以及《混凝土结构加固设计规范》GB 50367-2006中对于用碱矿渣胶凝材料粘贴CFRP布加固混凝土梁的极限承载力的计算方法没有做出说明,对其在正常使用情况下的变形以及裂缝开展情况的计算方法也没有做出相关的阐述。因而需要对这类用碱矿渣胶凝材料粘贴碳纤维片材加固结构受弯构件的承载力、变形以及裂缝情况进行专门的分析与研究。
针对上述问题,本文进行了6根用碱矿渣胶凝材料粘贴碳纤维布加固的混凝土梁的试验与研究。主要研究成果如下:
(1)证明了用碱矿渣胶凝材料粘贴碳纤维布加固的混凝土梁可以避免碳纤维布与混凝土之间的剥离破坏,表明用碱矿渣胶凝材料粘贴碳纤维布加固混凝土结构构件是可行的。
(2)对6根用碱矿渣胶凝材料粘贴碳纤维布加固混凝土梁的试验表明,若合理设计,可使破坏模式呈现受拉纵向钢筋先屈服,然后碳纤维布被拉断和呈现受拉钢筋先屈服,受压边缘混凝土达到极限压应变等两种理想破坏模式。
(3)提出了用碱矿渣胶凝材料粘贴碳纤维布加固混凝土简支梁刚度、裂缝宽度、承载力的计算方法。
The softening temperature of epoxy resin adhesive is between 60℃and 80℃which can not meet the requirement of fire resistance of concrete structures reinforced by pasting CFRP sheet. The alkali activating slag cement material (AASCM) with the duration of fair resistance of 600℃has been developed by our group , mechanical properties of the AASCM is superior to that of epoxy resin adhesive. So it is of practical significance to do research on the mechanical property of concrete beam reinforced by pasting CFRP sheet with AASCM.
The calculation method of ultimate bearing capacity, deformation and growth of crack in serviceability stage for concrete beam reinforced by pasting CFRP sheet with AASCM are not demonstrated in the current《Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate》(CECS146:2003) and《Design code for concrete structure》(GB 50367-2006). So it is needed to analyze and investigate the bearing capacity, deformation and crack of concrete flexural members reinforced by pasting CFRP sheet with AASCM.
(1) when the concrete beam are reinforced by pasting CFRP sheet with AASCM, the failure of breakaway between FRP and concrete can be avoided. The result shows that using AASCM as adhesive to strengthen concrete is feasible.
(2) The result of 6 concrete beams which are reinforced by pasting CFRP sheet with AASCM shows that under reasonable design, two ideal failure modes will be occur: The one is the tensile longitudinal steel bar yields firstly, then CFRP sheet breaks in tension; the other is the tensile longitudinal steel bar yields firstly, then the concrete utmost compressive fiber reaches the ultimate compressive strain.
(3) Calculation formulas of stiffness, crack width and carrying capacity of concrete beams reinforced by pasting CFRP sheet with AASCM are established.
现行的《碳纤维片材加固修复混凝土结构技术规程》(CECS146:2003)以及《混凝土结构加固设计规范》GB 50367-2006中对于用碱矿渣胶凝材料粘贴CFRP布加固混凝土梁的极限承载力的计算方法没有做出说明,对其在正常使用情况下的变形以及裂缝开展情况的计算方法也没有做出相关的阐述。因而需要对这类用碱矿渣胶凝材料粘贴碳纤维片材加固结构受弯构件的承载力、变形以及裂缝情况进行专门的分析与研究。
针对上述问题,本文进行了6根用碱矿渣胶凝材料粘贴碳纤维布加固的混凝土梁的试验与研究。主要研究成果如下:
(1)证明了用碱矿渣胶凝材料粘贴碳纤维布加固的混凝土梁可以避免碳纤维布与混凝土之间的剥离破坏,表明用碱矿渣胶凝材料粘贴碳纤维布加固混凝土结构构件是可行的。
(2)对6根用碱矿渣胶凝材料粘贴碳纤维布加固混凝土梁的试验表明,若合理设计,可使破坏模式呈现受拉纵向钢筋先屈服,然后碳纤维布被拉断和呈现受拉钢筋先屈服,受压边缘混凝土达到极限压应变等两种理想破坏模式。
(3)提出了用碱矿渣胶凝材料粘贴碳纤维布加固混凝土简支梁刚度、裂缝宽度、承载力的计算方法。
The softening temperature of epoxy resin adhesive is between 60℃and 80℃which can not meet the requirement of fire resistance of concrete structures reinforced by pasting CFRP sheet. The alkali activating slag cement material (AASCM) with the duration of fair resistance of 600℃has been developed by our group , mechanical properties of the AASCM is superior to that of epoxy resin adhesive. So it is of practical significance to do research on the mechanical property of concrete beam reinforced by pasting CFRP sheet with AASCM.
The calculation method of ultimate bearing capacity, deformation and growth of crack in serviceability stage for concrete beam reinforced by pasting CFRP sheet with AASCM are not demonstrated in the current《Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate》(CECS146:2003) and《Design code for concrete structure》(GB 50367-2006). So it is needed to analyze and investigate the bearing capacity, deformation and crack of concrete flexural members reinforced by pasting CFRP sheet with AASCM.
(1) when the concrete beam are reinforced by pasting CFRP sheet with AASCM, the failure of breakaway between FRP and concrete can be avoided. The result shows that using AASCM as adhesive to strengthen concrete is feasible.
(2) The result of 6 concrete beams which are reinforced by pasting CFRP sheet with AASCM shows that under reasonable design, two ideal failure modes will be occur: The one is the tensile longitudinal steel bar yields firstly, then CFRP sheet breaks in tension; the other is the tensile longitudinal steel bar yields firstly, then the concrete utmost compressive fiber reaches the ultimate compressive strain.
(3) Calculation formulas of stiffness, crack width and carrying capacity of concrete beams reinforced by pasting CFRP sheet with AASCM are established.
引文
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3赵新铭,欧日强.混凝土结构加固的主要方法与亟待解决的问题.港工技术,2007,2(4): 28~31
4 HuaXu, S.J.Van Deventer. The Effect of Alkali Metals on the Formation of Geopolymeric from Alkali Cement and Concrete Research. 2003 .1567~1574
5 Puyam S. Singh, Tim Bastow. Outstanding Problems Posed by Nonpolymeric Particulates in the Synthesis of a Well-structured Geopolymeric Material. CSIRO Manufacturinb and Infrastructure Technoloby. 2004, (3): 83~93
6 J.G.S. Van Jaarsveld, J.S.J. Van Deventer, Lukey. The Characterisation of Source Materials in Fly Ash-based Geopolymers. Cement&Concrete Composites. 2003 :345~352
7王旻,冯鹏,叶列平,覃维祖.用于纤维片材加固混凝土结构的无机粘结材料—地聚物.第三届全国FRP及其工程应用学术交流会论文集.南京, 2004: 16～20.
8王旻,覃维祖.化学激发胶凝材料用于CFRP加固混凝土柱的研究.施工技术, 2007, 36.(3):73～75.
9张嫦,马变龙,李晖,张彪.硅酸盐无机胶粘剂的研制及应用.中国胶粘剂,2005, 10, 35~37.
10 U.Meier, Strengthening of Structures Using Cabon Fiber/Epoxy Composites, Construction and Building Materails, 1995, 9(6)
11 U.Meier and H.Kaiser. Strengthening of Structures with CFRP Laminate. Proceeding of the ASCE Conference-ACM Materials in Civil Engineering Structures, ASCE, 1991:224~232
12 Tom Norris, Hamid Saadatmanesh and Mohammad R.Ehsani. Shear and Flexural Strengthening of RC Beams with Carbon Fiber Sheets. Journal of Structural Engineering. 1997, 123(7):903~911
13 John F.Bonacci and Mohamed Maalej. Externally Bonded Fiber-ReinforcedPloymer for Rehabilitation of Corrosion Damaged Concrete Beams. ACI Structural Journal. 2000, 97(6):703~711
14 AlfarabiSharif, G.J.AlSuaimani, I.A.Basunbul, and B.N.Ghaleb. Strengthening of Initially Loaded Reinforced Concrete Beams Using FRP Plates. ACI Structural Journal. 1994, 91(2):160~168
15 Marco Arduini and Antonio Nanni. Behavior of precracked RC Beams Strengthened with Carbon FRP Sheets. Journal of Composites for Construction. 1997, 1(2):63~70
16 Mohsen Shahawy, Omar Chaalal, Thomas E.Beitelman and Adnan El-Saad. Flexural Strengthening with Carbon Fiber-Reinforced Full-Scale Girders. ACI Structural Journal. 2001, 98(5): 735~743
17 Al-Sulaimani, G.J.etc. Shear Repair for Reinforced Concrete by Fiberglass Plate Bonding. ACI Structural Journal, 2002, 95(3):458~464
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