纤维复合材料布加固钢筋混凝土梁的截面刚度

Calculation of Sectional Stiffness of Reinforced Concrete Beams Strengthened with Fiber Reinforced Polymer Cloth

为了准确计算正常使用阶段纤维复合材料(FRP)加固钢筋混凝土梁的复合刚度,以材料力学理论推导为基础,结合数值模拟,研究了加固梁的刚度性能。通过曲率引入曲线方程,建立挠度、刚度和弯矩三者之间的关系;然后运用有限元软件模拟加固梁,观察梁在不同荷载下的跨中挠度,预测了加固梁的复合刚度。研究结果表明:模型计算值与文献中的实验值吻合较好,使用该模型可以有效地预测加固梁的刚度。

In order to accurately calculate the composite stiffness of reinforced concrete beams strengthened with fiber reinforced concrete in during normal working conditions. the stiffness of reinforced beams was studied based on the theoretical study of material mechanics and the numerical simulation. The relationship between deflection,stiffness and bending moment is established by curvature curve,and then the finite element software is used to simulate the strengthened beam. The cross-deflection of the beam under different loads is observed and the composite stiffness of the strengthened beam is predicted. The results show that the calculated values of this model are in good agreement with the experimental data in the literature,and the stiffness of the strengthened beams can be effectively predicted by this model.