Liang Ruiqing, Zhang Botao, Liang Zhensheng, Li Xiemi, Xiao Shuhua
Guangzhou Electric Power Design Institute Co., Ltd., Guangzhou 510060, China.
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Materials (Basel). 2025 May 14;18(10):2282. doi: 10.3390/ma18102282.
Steel fiber-reinforced polymer (FRP) composite bars (SFCBs) combine the ductility of steel reinforcement with the corrosion resistance and high strength of FRP, providing stable secondary stiffness that enhances the seismic resistance and safety of seawater sea-sand concrete structures. However, the seismic performance of SFCB-reinforced seawater sea-sand concrete beam-column joints remains underexplored. This study presents pseudo-static tests on SFCB-reinforced beam-column joints with varying column SFCB longitudinal reinforcement fiber volume ratios (64%, 75%, and 84%), beam reinforcement fiber volume ratios (60.9%, 75%, and 86%), and axial compression ratios (0.1 and 0.2). The results indicate that increasing the axial compression ratio enhances nodal shear capacity and bond strength, limits slip, and reduces crack propagation, but also accelerates bearing capacity degradation. Higher column reinforcement fiber volumes improve crack distribution and ductility, while beam reinforcement volume significantly affects energy dissipation and crack distribution, with moderate volumes (e.g., 75%) yielding optimal seismic performance. These findings provide insights for the seismic design of SFCB-composite-reinforced concrete structures in marine environments.
钢纤维增强聚合物（FRP）复合筋（SFCB）兼具钢筋的延性以及FRP的耐腐蚀性能和高强度，能提供稳定的次刚度，增强海水海砂混凝土结构的抗震性能和安全性。然而，SFCB增强的海水海砂混凝土梁柱节点的抗震性能仍未得到充分研究。本研究对柱SFCB纵向配筋纤维体积率（64%、75%和84%）、梁配筋纤维体积率（60.9%、75%和86%）以及轴压比（0.1和0.2）不同的SFCB增强梁柱节点进行了拟静力试验。结果表明，提高轴压比可增强节点抗剪能力和粘结强度，限制滑移并减少裂缝扩展，但也会加速承载力退化。较高的柱配筋纤维体积可改善裂缝分布和延性，而梁配筋体积对能量耗散和裂缝分布有显著影响，中等体积（如75%）可产生最佳抗震性能。这些研究结果为海洋环境中SFCB复合增强混凝土结构的抗震设计提供了见解。
