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采用有限元方法对碳纤维布加固钢筋混凝土构件进行非线性分析,是对有限的试验研究的有效补充和进一步深入探讨。根据4根碳纤维布加固钢筋混凝土箱梁的试验研究结果,建立了合理的三维有限元模型,对碳纤维布加固钢筋混凝土箱梁在弯剪扭复合受力下的抗扭性能进行了非线性有限元分析。计算得到的扭矩-扭转角关系曲线、钢筋和碳纤维布的应变曲线以及界面粘接单元的恢复力曲线等与试验结果吻合较好,可以较好地模拟碳纤维布加固箱梁的受扭性能。进一步通过对7根数值梁的计算结果分析,提出碳纤维布加固钢筋混凝土箱梁在复合受力下的剪扭相关性符合直线方程。
Finite element method of non-linear analysis of reinforced concrete members reinforced with carbon fiber sheet is an effective supplement to the limited experimental study and further in-depth discussion. Based on the experimental results of four CFRP reinforced concrete box girders, a reasonable three-dimensional finite element model was established to simulate the torsional behavior of RC box-girder reinforced concrete (CFST) beams subjected to combined bending and torsional shear forces. The nonlinear finite element method analysis. The calculated torque-torsion angle curves, the strain curves of steel bar and carbon fiber cloth and the restoring force curves of the interface bonding units are in good agreement with the experimental results, which can well simulate the torsional behavior of box girders reinforced with carbon fiber sheets. Through the analysis of the calculation results of seven numerical beams, it is proposed that the shear-torsion correlation of CFRP-reinforced concrete box girder under composite stress conforms to the linear equation.