碳纤维筋加固钢筋混凝土梁基本力学性能的三维非线性分析

Three-dimensional nonlinear analysis of basic mechanical properties of reinforced concrete beams strengthened by carbon fiber reinforced polymer bars

建立钢筋与混凝土的分离式有限元模型,对碳纤维筋加固钢筋混凝土梁与普通钢筋混凝土梁分别进行数值模拟分析,并将模拟分析结果与试验结果比较可知,此种数值模拟方法能够得到合理的分析结果。通过数值模拟讨论了增加碳纤维筋直径和改善碳纤维筋与混凝土之间的粘接情况对梁基本力学性能的影响,结果表明,增加碳纤维筋直径能增加梁的承载力,但对其延性有不利影响。改善碳纤维筋与混凝土之间的粘结性可以有效地提高钢筋混凝土梁的受力性能,且二者在梁跨中纯弯段粘结性的改善对钢筋混凝土梁受力性能提高效果尤为显著。

The discrete finite element modeling of bar and concrete was established. Numerical simulation analyses of reinforced concrete（ RC） beam with carbon fiber reinforced polymer（ CFRP） bars and common RC beam were carried out.Comparative analyses of numerical simulation results and experimental results were carried out, and the numerical simulation method can obtain a relatively good result. Subsequently,the influence of increasing the diameter of CFRP bars and improving the connectivity between the CFRP bars and concrete on basic mechanical properties of beams was discussed. The results show that increasing the diameter of CFRP bars can enhance the bearing capability of RC beam,however,it results in ductility loss respectively. Improving the connectivity between the CFRP bars and concrete leads a significant improvement of mechanical behavior of RC beam. Especially,improving the connectivity between the CFRP bars and concrete near midspan of beam contributes to improving the mechanical properties of RC beam significantly.