工艺与制造英文2020被引 20
简支预应力混凝土梁中FRP筋和钢筋应用的数值研究——外置FRP腱索体系
Numerical Study of Using FRP and Steel Rebars in Simply Supported Prestressed Concrete Beams with External FRP Tendons
Miao Pang, Zhangxiang Li, Tiejiong Lou · Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
摘要整理
本研究通过数值模拟方法，系统考察了在外置FRP腱索预应力混凝土梁（PCBs）中采用纤维增强复合材料（FRP）筋替代钢筋的可行性。基于实验验证的数值程序，对简支预应力混凝土梁进行了参数化分析，主要变量包括筋材类型和配筋面积。研究对象涵盖三种筋材：碳纤维增强复合材料（CFRP）筋、玻纤增强复合材料（GFRP）筋和普通钢筋。拉伸筋配筋率范围为0.22%~2.16%。研究结果表明：采用CFRP筋的梁体表现出更优的裂缝形态和更高的极限承载力，相比GFRP筋和钢筋梁明显提升；GFRP筋梁的极限挠度和腱索应力增量均显著高于钢筋梁。此外，对多种无粘结腱索极限应力计算模型进行了评估。研究提出了一个解析模型，用于预测外置预应力混凝土梁中钢筋和FRP筋体系的腱索极限应力和抗弯强度。模型预测结果与数值模拟结果吻合良好，验证了模型的有效性。
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