为探讨碳纤维布加固渡槽机理并确定最优加固方案,应用正交设计方法,以纤维布厚度、横向间距、条宽和弹模4个参数作为正交分析的4个因素,每个因素取3个水平,设计了9组加固处理方案,在满槽工况下,采用有限差分元进行数值计算。结果表明:碳纤维布能明显改善渡槽的拉应力分布,采用碳纤维布加固后,拉应力主要集中于碳纤维布附近,渡槽拉应力区范围明显减少；用碳纤维布加固后,渡槽最大竖向位移明显减小,且碳纤维布弹性模量对渡槽最大竖向变形影响最敏感；综合考虑渡槽变形和经济因素,碳纤维布加固渡槽的最优碳纤维布厚度为0.4 mm,最优间距为3 m,最优条宽为0.4 m,最优弹模为3×105 MPa。
In order to discuss the mechanism of reinforcing aqueduct with carbon fiber cloth and determine the optimal reinforcing scheme, the orthogonal design method was used to design nine groups of reinforcement treatment schemes. Four parameters of fiber cloth thickness, transverse spacing, strip width and elastic modulus were taken as four factors of orthogonal analysis. Each factor took three levels, under full tank condition; finite difference element method was used for numerical calculation. The results show that the tensile stress distribution of the aqueduct can be significantly improved by using carbon fiber sheet. After strengthening with carbon fiber sheet, the tensile stress mainly concentrates near the carbon fiber sheet, and the range of the tensile stress zone of the aqueduct is obviously reduced; The maximum vertical displacement of the aqueduct is obviously reduced after the reinforcement with CFRP, and the elastic modulus of CFRP is most sensitive to the maximum vertical deformation of the aqueduct; Considering the deformation and economic factors of aqueduct, the optimal thickness of carbon fiber cloth reinforced aqueduct is 0.4mm, the optimal spacing is 3m, the optimal strip width is 0.4m, and the optimal elastic modulus is 3×105MPa.