将Monte Carlo随机抽样方法与JC法相结合(称为Monte Carlo-JC法),利用Matlab软件自带的随机数发生器编制了程序,针对ACI 440.2R-02设计指南(称为ACI指南)中的FRP抗弯加固条款进行了较为系统的可靠度评估.可靠度分析结果表明: 混凝土强度f'c、CFRP片材配筋率ρf及CFRP片材性能是影响抗力比值均值和标准差的3个主要因素;可靠度指标的平均值随着折减系数的增大而逐步减小,且随着荷载效应比值Ln/Dn的增大而减小.对所有可靠度指标进行统一考虑,得到整体抗弯设计指标β0为4.40,可见该指南的可靠度水平偏高.基于对抗力折减系数的参数研究结果,无论钢筋的应变水平如何,建议取固定值0.90.在所有相关设计指南中,ACI指南最具有代表性,对该指南的可靠度评估具有普遍意义.
参考文献
| [1] | American Concrete Institute.Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures,ACI 440.2R-02[R].Detroit:American Concrete Institute,2002. |
| [2] | ISIS Canada Corporation.Strengthening reinforced concrete structures with externally-bonded fibre reinforced polymers,ISIS design manual 4[R].Manitoba,Canada:ISIS Canada Corporation,2001. |
| [3] | Canadian Standards Association.Design and construction of building components with fibre reinforced polymers CSA-S806-02[R].Toronto,Canada:Canadian Standards Association International,2002. |
| [4] | fib Task Group 9.3.Externally bonded FRP reinforcement for RC structures,Bulletin 14[R].Lausanne,Switzerland:Federal Institute of Technology,2001. |
| [5] | Japan Society of Civil Engineers.Recommendations for upgrading of concrete structures with use of continuous fiber sheets[R].Tokyo,Japan:Japan Society of Civil Engineers,2000. |
| [6] | He Z,Ou J P.Probability-based design for FRP reinforced concrete structures:A critical review and research needs[C]// Proceedings of the 50th SAMPE Symposium.Long Beach,California,USA:Society of Advanced Materials and Process Engineering,2005. |
| [7] | Rackwitz R,Fiessler B.Structure reliability under combined random sequences[J].Computers & Structures,1978,9:489-494. |
| [8] | Melchers R E.Structural reliability analysis and prediction[M].New York:John Wiley & Sons,1999. |
| [9] | GangaRao H V S,Vijay P V.Bending behavior of concrete beams wrapped with carbon fabric[J].Journal of Structural Engineering,1998,124(1):3-10. |
| [10] | American Concrete Institute.Building code requirements for structural concrete,ACI 318-02[R].Detroit:American Concrete Institute,2002. |
| [11] | Hognestad E,Hanson N W,McHenry D.Concrete stress distribution in ultimate strength design[J].ACI Structural Journal,1955,52(4):455-479. |
| [12] | Ellingwood B,Galambos T V,MacGregor J G,et al.De-velopment of a probability based load criterion for American national standard A58 building code requirements for minimum design loads in buildings and other structures,Special publication 577[R].Washington D C:Department of Commerce,National Bureau of Standards,1980. |
| [13] | The Math Works Inc.Users guide for statistics toolbox of Matlab 7.0[M].Natrick,MA,USA:The MathWorks Inc,2004. |
| [14] | 黄永春.基于ACI和ISIS设计指南的FRP配筋混凝土构件可靠度评估[D].哈尔滨:哈尔滨工业大学,2005.Huang Yongchun.Reliability assessment of FRP reinforced concrete members designed by ACI and ISIS design guidelines[D].Harbin:Harbin Institute of Technology,2005. |
| [15] | Nowak A S,Szerszen M M.Calibration of design code for buildings (ACI318) Ⅰ:Statistical models for resistance[J].ACI Structural Journal,2003,100(3):377-382. |
| [16] | Plevris N,Triantafillou T C,Veneziano D.Reliability of RC members strengthened with CFRP laminates[J].Journal of Structural Engineering,1995,121(7):1037-1044. |
| [17] | Okeil A M,El-Tawil S,Shahawy M.Flexural reliability of reinforced concrete bridge girders strengthened with carbon fiberreinforced polymer laminates[J].Journal of Bridge Engineering,2002,7(5):290-299. |
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