考虑二次受力的CFRP加固砼梁抗弯性能研究
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摘要
碳纤维布作为一种新型的加固材料,使用越来越普遍。由于它具有轻质、高强、施工便利等优点,使得其在混凝土结构加固领域得到了大量应用。
在理论分析中,对二次受力情况下碳纤维布加固钢筋混凝土梁的受弯性能进行了研究。根据分析,提出了在正截面承载力计算时CFRP应乘以强度折减系数ψ,并建立了正截面承载力计算表达式。
在数值分析中,本文共对20根截面尺寸为150mm×300mm,长为2000mm的梁进行了数值模拟,其中2根为对比梁,6根为一次加固梁,12根为二次加固梁。混凝土强度等级为C30,主要变化参数为初始荷载、配筋率、CFRP加固层数及粘贴长度。模拟分析结果表明,加固后梁的正截面承载力和刚度都有了显著提高。加固梁的承载力与CFRP粘贴层数有很大的关系。CFRP粘贴层数越多,加固梁的承载力提高越大,但提高的幅度与粘贴层数并不是线性增长的,随着粘贴层数的增多增加的幅度越来越小。CFRP粘贴长度越长,对梁的承载力提高越大,但并不是越长越好。根据对结果的分析,本文认为当CFRP粘贴长度为纯弯段加两倍梁高范围内时加固效果更明显。
最后,在理论分析、数值模拟及试验验证的基础上,给出了CFRP的强度折减系数值和正截面承载力计算表达式。
Recently, a new composite material named Carbon Fiber Reinforced Plastic (CFRP) is becoming increasingly popular as a kind of reinforcement material. It is widely used in the field of reinforcement region of concrete structures because it has many advantages such as high tensile strength, high modulus of elasticity, lightweight, corrosion resistance and good workability.
In the theoretical analysis,the flexural behavior of reinforced concrete(RC) beams reinforced by CFRP under quadratic loading are studied in this paper. According to analysis,the calculation expression of normal section bearing capacity of CFRP is set up, and it is put forward that strength reduction factorψshould be multiplied in the calculation of normal section bearing capacity of CFRP.
In the numerical analysis, twenty simply supported beam specimens with the dimensions of 150mm×300mm×2000mm are investigated. Among them, there are two non-strengthened control beams and six RC beams reinforced with CFRP directly and twelve secondary-loading RC beams reinforced with CFRP. Concrete strength grade is C30,the main parameters is initial load,reinforcement ratio, CFRP layers and pasting length. The simulation analysis indicates that the normal section flexural bearing capacity and stiffness of beams are significantly increased after strengthened. CFRP sheet layers have effect on strengthening effect of beams, flexural bearing capacity of beams increase with the increase of CFRP sheet layers. However,the increase extent of them is not linear. Pasting length of CFRP is the longer, flexural bearing capacity increases the larger, but increase extent of the length has a reasonable scope. Analysis results show that when pasting length is the length of pure bending section plus twice the beam’s height, the strength effect is more obvious.
Finally, based on theoretical analysis, numerical simulation and test verification, the strength reduction factor and the calculation expression of normal section bearing capacity of CFRP are given.
在理论分析中,对二次受力情况下碳纤维布加固钢筋混凝土梁的受弯性能进行了研究。根据分析,提出了在正截面承载力计算时CFRP应乘以强度折减系数ψ,并建立了正截面承载力计算表达式。
在数值分析中,本文共对20根截面尺寸为150mm×300mm,长为2000mm的梁进行了数值模拟,其中2根为对比梁,6根为一次加固梁,12根为二次加固梁。混凝土强度等级为C30,主要变化参数为初始荷载、配筋率、CFRP加固层数及粘贴长度。模拟分析结果表明,加固后梁的正截面承载力和刚度都有了显著提高。加固梁的承载力与CFRP粘贴层数有很大的关系。CFRP粘贴层数越多,加固梁的承载力提高越大,但提高的幅度与粘贴层数并不是线性增长的,随着粘贴层数的增多增加的幅度越来越小。CFRP粘贴长度越长,对梁的承载力提高越大,但并不是越长越好。根据对结果的分析,本文认为当CFRP粘贴长度为纯弯段加两倍梁高范围内时加固效果更明显。
最后,在理论分析、数值模拟及试验验证的基础上,给出了CFRP的强度折减系数值和正截面承载力计算表达式。
Recently, a new composite material named Carbon Fiber Reinforced Plastic (CFRP) is becoming increasingly popular as a kind of reinforcement material. It is widely used in the field of reinforcement region of concrete structures because it has many advantages such as high tensile strength, high modulus of elasticity, lightweight, corrosion resistance and good workability.
In the theoretical analysis,the flexural behavior of reinforced concrete(RC) beams reinforced by CFRP under quadratic loading are studied in this paper. According to analysis,the calculation expression of normal section bearing capacity of CFRP is set up, and it is put forward that strength reduction factorψshould be multiplied in the calculation of normal section bearing capacity of CFRP.
In the numerical analysis, twenty simply supported beam specimens with the dimensions of 150mm×300mm×2000mm are investigated. Among them, there are two non-strengthened control beams and six RC beams reinforced with CFRP directly and twelve secondary-loading RC beams reinforced with CFRP. Concrete strength grade is C30,the main parameters is initial load,reinforcement ratio, CFRP layers and pasting length. The simulation analysis indicates that the normal section flexural bearing capacity and stiffness of beams are significantly increased after strengthened. CFRP sheet layers have effect on strengthening effect of beams, flexural bearing capacity of beams increase with the increase of CFRP sheet layers. However,the increase extent of them is not linear. Pasting length of CFRP is the longer, flexural bearing capacity increases the larger, but increase extent of the length has a reasonable scope. Analysis results show that when pasting length is the length of pure bending section plus twice the beam’s height, the strength effect is more obvious.
Finally, based on theoretical analysis, numerical simulation and test verification, the strength reduction factor and the calculation expression of normal section bearing capacity of CFRP are given.
引文
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[4]谢剑.碳纤维布加固钢筋混凝土梁受弯承载力设计方法的研究.水利水电技术,2001年08期.
[5] Alfarabi Sharif, G. J. Al-Sulaimani,1. A. Basunbul, M. H. Baluch, and B. N. Ghaleb,“Strengthening of Initially Loaded Reinforced Concrete Beams Using FRP Plates”,ACI Structural Journal, V.91,No.2, March-April, 1994.
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[10] Tom Norris, Hamid Saadatmanesh, and Mohammad R. Ehsani, "Shear and Flexural Strengthening of R/C Beams With Carbon Fiber Sheets", Journal of Structural Engineering, ASCE, Vo1.123, No.7, July, 1997.
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[2]陈小兵,颜子涵,岳清瑞,牟宏远.碳纤维材料加固钢筋混凝土梁的试验研究.工业建筑,第28卷,第11期,1998.
[3]赵彤.碳纤维布加固钢筋混凝土板受弯性能的研究.建筑技术,2001年06期.
[4]谢剑.碳纤维布加固钢筋混凝土梁受弯承载力设计方法的研究.水利水电技术,2001年08期.
[5] Alfarabi Sharif, G. J. Al-Sulaimani,1. A. Basunbul, M. H. Baluch, and B. N. Ghaleb,“Strengthening of Initially Loaded Reinforced Concrete Beams Using FRP Plates”,ACI Structural Journal, V.91,No.2, March-April, 1994.
[6] Philip A. Ritchie, David A. Thomas, Le-wu Lu, and Guy M. Connelly,“External Reinforcement of Concrete Beams Using Fiber Reinforced Plastics”, ACI Structural Journal, V.88, No.4, July-august, 1991.
[7]彭添富,李由丰,施邦筑,朱国栋,邱佑宗,郑育祥.碳纤维强化高分子复合材料(CFRP)应用于简支钢筋混凝土梁之补强最佳化设计与验证.结构工程,第十二卷,第四期,民国八十六年十二月.
[8]宇治公隆.使用板状连续碳素纤维材的己有钢筋混凝土构件的剪切力提高效果的研究.混凝土工学论文集,第3卷第2号,1992年7月.
[9]李松辉,赵国藩,王松根. CFRP加固钢筋混凝土梁受剪承载能力实用计算方法.土木工程学报,2005年07期.
[10] Tom Norris, Hamid Saadatmanesh, and Mohammad R. Ehsani, "Shear and Flexural Strengthening of R/C Beams With Carbon Fiber Sheets", Journal of Structural Engineering, ASCE, Vo1.123, No.7, July, 1997.
[11] Amir M. Malek and Hamid Saadatmanesh,“Ultimate Shear Capacity of Reinforced Concrete Beams Strengthened with Web-Bonded Fiber-Reinforced Plastic Plates”, ACI Structural Journal, V.95, No.4, July-Aug, 1998.
[12] Amir M. Malek, Hamid Saadatmanesh,“Analytical Study of Reinforced Concrete Beams Strengthened with Web-Bonded Fiber Reinforced Plastic Plates or Fabrics", ACI Structural Journal, V.95, No.3, May-June, 1998.
[13] Michel Samaan, Amir Mirmiran, and Mohsen Shahawy,“Model of Concrete Confined by Fiber Composites”, Journal of Structural Engineering, Vol.124, No.9, Sep., 1998.
[14] Amir Mirmiran, and Mohsen Shahawy,“Behavior of Concrete Columns Confined by Fiber Composites”, Journal of Structural Engineering, Vol. 123, No.5, May, 1997.
[15] H. Saadatmanesh, M. R. Ehsani, and Limin Jin,“Seismic Strengthening of Circular Bridge Pier Models with Fiber Composites”, ACI Structural Journal, V.93, No.6,Nov.-Dec., 1996.
[16] Hamid Saadatmanesh,Mohammad R. Ehsani, and Limin Jin,“Repair of Earthquake-Damaged RC Columns with FRP Wraps”, ACI Structural Journal, V.94, No.2, March-April, 1997.
[17] Marco Arduini, Angelo Di Tommaso, and Antonio Nanni,“Brittle failure in FRP Plate and Sheet Bonded Beams”, ACI Structural Journal, V.94, No.4, July-Aug, 1997.
[18] H. Varastehpour, and P. Hamelin,“Strengthening of Concrete Beams Using Fiber-Reinforced Plastics”, Materials and Structures, Vo1.30, April, 1997.[24] M. Arduini, A. Di Tommaso, and O. Manfroni,“Fracture Mechanisms of Concrete Beams Bonded with Composite Plates”, Non-Metallic(FRP) Reinforcement for Concrete Structures, Proceedings of the Second International RILEM Symposium(FRPRCS-2).
[19] T. C. Triantafillou, and N. Plrvris,“Strengthening of RC Beams with Epoxy-Bonded Fiber-Composite Materials”, Materials and Structures, Vo1.25, No. 148, May, 1992.
[20] M. Raoof, and S. Zhang,“An Insight into the Structural Behavior of Reinforced Concrete Beams with Externally Bonded Plates”, Proceedings of the Institution of Civil Engineers: Structures and Buildings, Nov, 1997.
[21] Houssam A. Toutanji and Tahar El-Krochi,“Tensile Durability of Cement-Based FRP Composite Wrapped Specimens”, Journal of Composites for Construction, Vo1.3, No. 1, Feb, 1999.
[22] Khaled A. Soudki, and Mark F. Green,“Freeze-Thaw Response of CFRP Wrapped Concrete”, Concrete International, V.19, No. 8, Aug, 1997.
[23] Houssam A. Toutanji, and William G o' mez,“Durability Characteristics of Concrete Beams Externally Bonded with FRP Composite Sheets”, Cement and Concrete Composites Vol. 19. No.4. Aug. 1997.
[24]沈华,马莉莉.二次受力下碳纤维布加固梁抗弯性能试验研究.南通职业大学学报,第21卷第1期,2007年3月.
[25]陈丽莹,高日.二次受力下CFRP加固混凝土结构抗弯承载力计算方法.北方交通大学学报,第27卷第1期,2003年2月.
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