Duan Ning, Zhang Ji-Wen, Cheng Jun
Department of Civil Engineering, Southeast University, Nanjing 210096, China.
Materials (Basel). 2022 Aug 18;15(16):5697. doi: 10.3390/ma15165697.
This paper examines the effects of different loading patterns on the static characteristics of continuous concrete beams reinforced with external prestressed carbon fiber-reinforced polymer tendons (EPCFRPT) and qualitatively analyzes the results for two continuous concrete beams: SB-1 under symmetrical loading, and SB-2 under asymmetrical loading. Then, a finite element analysis model is introduced and calibrated by tests conducted at Southeast University and data collected from a literature review. Based on the FEA model, the initial prestress, cross-section area, and eccentricity of CFRP tendons as well as the steel reinforcement configuration were selected by a parametric study. The results indicated that the initial prestress and tendon cross-section area had the most influence on the tendon stress increment and the secondary bending moment of the middle support, while the reinforcement distribution and eccentricity of the tendons had little effect. The secondary bending moment had a linear positive correlation with the stress increment of tendons. These results allow a simplified equation for calculating the external load bending moment amplitude coefficient at ultimate to be proposed.
本文研究了不同加载模式对体外预应力碳纤维增强聚合物筋（EPCFRPT）加固连续混凝土梁静力特性的影响，并对两根连续混凝土梁的结果进行了定性分析：对称加载下的SB-1梁和非对称加载下的SB-2梁。然后，引入了有限元分析模型，并通过东南大学进行的试验和文献综述收集的数据进行了校准。基于有限元分析模型，通过参数研究选择了CFRP筋的初始预应力、横截面面积、偏心距以及钢筋配置。结果表明，初始预应力和筋的横截面面积对筋应力增量和中间支座的二次弯矩影响最大，而钢筋分布和筋的偏心距影响较小。二次弯矩与筋的应力增量呈线性正相关。这些结果使得能够提出一个用于计算极限状态下外荷载弯矩幅值系数的简化方程。
