CFRP加固RC梁抗弯可靠度设计方法研究

Design Method Researching of Flexural Reliability for CFRP-Strengthened RC Beams

根据结构可靠指标的几何意义,建立了正态随机变量与非正态随机变量下结构可靠度计算的优化模型,并对其优化算法进行研究,该方法无需对非线性功能函数作线性化处理,从而提高了结构可靠度的计算精度.特制了16根碳纤维复合材料(CFRP)加固钢筋混凝土(RC)试验梁,其中4根梁中皆埋入了FBG光栅传感器.试验结果表明:CFRP加固梁荷载效应与极限承载力的数值计算与试验测定值吻合.通过试验得到了全部梁随机变量的统计参量.研究编制基于MATLAB优化工具箱的可靠指标优化程序,完成对CFRP加固RC梁抗弯可靠度的优化设计,模拟计算结果得到了基于试验的改进一次二阶距(AFOSM)法验证.

On the basis of the geometrical meaning of structural reliability index, an optimum model for structural reliability analysis under conditions of normal random variables and abnormal random variables was established. Taking advantage of the existing optimum methods, the nonlinear performance function need not to be lined by the proposed method ,which improved the accuracy of reliability calculation. In the experiments of 16 tested reinforced concrete （RC） beams, the statistic parameters of stochastic variables were obtained. The optimum designing of flexural reliability of RC beams strengthened with carbon fiber reinforced polymers （CFRP） was completed with reliability index optimum programs based on Matlab toolbox. The simulating results had been tested and verified with advanced first order second moment method （AFOSM） based on experiments.