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应用MonteCarlo-JC法评估FRP加固RC梁受弯承载力可靠度

, PP. 116-121

Keywords: CFRP,钢筋混凝土,可靠度指标,Monte,Carlo模拟,JC法,抗力折减系数

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Abstract:

将MonteCarlo随机抽样方法与JC法相结合(称为MonteCarlo-JC法),利用Matlab软件自带的随机数发生器编制了程序,针对ACI440.2R-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。

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