玄武岩FRP筋纤维混凝土连续梁弯矩重分布参数化研究

A. Abushanab
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引用次数: 1

摘要

卡塔尔国一年中的大部分时间都处于恶劣的环境和沿海条件下。因此,钢筋混凝土结构受到快速腐蚀和恶化。因此,有必要用纤维增强聚合物(FRP)钢筋代替传统的钢筋。FRP筋除了耐腐蚀外,其强度重量比高于钢筋,这使得FRP筋成为钢筋的可行替代品。连续混凝土梁是停车场和立交桥等结构中常用的构件。在这种结构中,开裂后的临界截面之间可以分配力。这种现象被称为力矩再分配。减少了连接处钢筋的拥塞,提高了构件的延性。然而,FRP材料的线弹性性能使得连续梁重新分配荷载和弯矩的能力值得怀疑。本研究旨在探讨玄武岩纤维增强混凝土(BFRC)连续梁经玄武岩FRP筋(BFRP筋)加固后的弯矩重分布能力。11根200 x 300 x 4000 mm的钢筋混凝土(RC)连续梁在五点荷载下进行了失效测试。研究的主要参数为配筋率(0.6rb、1.0rb、1.8rb和2.8rb;其中rb为平衡配筋率)、马镫间距(80和120 mm)和玄武岩-宏观纤维(BMF)体积分数(0.75和1.5%)。然后使用验证的有限元模型进行了参数化研究,以扩展可能影响RC连续梁弯矩重分布的参数。结果表明,当底部与顶部配筋比至少为0.3时,梁的弯矩会发生重分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Parametric Study on Moment Redistribution of Fiber Reinforced Concrete Continuous Beams with Basalt FRP Bars
The state of Qatar is suffering from its harsh environment and coastal conditions, which stand for most of the year. As a result, steel-reinforced concrete structures are subjected to rapid corrosion and deterioration. Therefore, there is a necessity to replace the conventional steel reinforcement by fiber-reinforced polymers (FRP) bars. Apart from FRP bars corrosion resistance, their strength to weight ratio is higher than steel reinforcement, which made the FRP, bars a viable alternative to steel reinforcement. Continuous concrete beams are commonly used elements in structures such as parking garages and overpasses. In such structures, forces could be distributed between the critical sections after cracking. This phenomenon is called moment redistribution. It reduces the congested rebars in connections and enhances the ductility of the members. However, the linear-elastic behaviour of FRP materials makes the ability of continuous beams to redistribute loads and moments questionable. This study aims to investigate the capability of moment redistribution of basalt fiber reinforced concrete (BFRC) continuous beams reinforced with basalt FRP (BFRP) bars. Eleven reinforced concrete (RC) continuous beams of 200 x 300 x 4000 mm were tested up to failure under fivepoint loading. The main investigated parameters were the reinforcement ratio (0.6rb, 1.0rb, 1.8rb and 2.8rb; where rb is the balanced reinforcement ratio), stirrups spacing (80 and 120 mm) and volume fractions of Basalt-macro fibers (BMF) (0.75 and 1.5%). A parametric study was then conducted using a validated finite element (FE) model to extend the investigated parameters that may affect the moment redistribution of RC continuous beams. It was concluded that moment redistribution occurs in beams that have at least a ratio of bottom to top reinforcement of 0.3.
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