Sha Xin, Davidson James S
Department of Civil and Environmental Engineering, Auburn University, Auburn, AL 36849, USA.
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China.
Materials (Basel). 2023 Sep 24;16(19):6376. doi: 10.3390/ma16196376.
Composite beam theory was previously developed to establish an analytical solution for determining the transfer length of prestressed fiber-reinforced polymers (FRP) tendons in pretensioned concrete members. In the present study, a novel finite element (FE) modeling approach is proposed to provide further verification of the developed analytical method. The present FE model takes into account the friction coefficients obtained from pull-out tests on the FRP tendons and prestressed concrete members. Convergence analysis of two numerical simulations with different mesh densities is carried out as well. The results demonstrated that the transfer length predicted by the fine FE model with a friction coefficient of α = 0.3 for high pretension is in good agreement with the measured values and the analytical solutions. The consistency between the analytical solution and FE simulation not only further proves the reliability of composite beam theory but also demonstrates the importance of the bond-slip relationship in predicting the transfer length of pretensioned concrete members prestressed with FRP tendons.
组合梁理论先前已被开发出来，用于建立一个解析解，以确定预应力纤维增强聚合物（FRP）筋在先张法混凝土构件中的传递长度。在本研究中，提出了一种新颖的有限元（FE）建模方法，以进一步验证所开发的解析方法。本有限元模型考虑了从FRP筋和预应力混凝土构件的拉拔试验中获得的摩擦系数。还对具有不同网格密度的两个数值模拟进行了收敛性分析。结果表明，对于高预应力，摩擦系数α = 0.3的精细有限元模型预测的传递长度与测量值和解析解吻合良好。解析解与有限元模拟之间的一致性不仅进一步证明了组合梁理论的可靠性，还证明了粘结-滑移关系在预测FRP筋预应力先张法混凝土构件传递长度中的重要性。
