用离散的玻璃纤维增强的聚合物网格条纹与喷的聚尿素结合,在平面内加强未固的造墙壁
Piyong Yu1, Pedro Silva2, Antonio Nanni3
1College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
Materials (Basel, Switzerland)
|February 26, 2025
概括
用玻璃纤维增强聚合物 (GFRP) 网格条加强非钢化 (URM) 墙壁,可以显著提高剪切能力和伪柔性. 这种方法提高了结构性能,并可以改变故障模式以提高弹性.
科学领域:
- 结构工程 结构工程
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
背景情况:
- 非钢筋造 (URM) 墙壁容易发生剪切故障,在地震区域构成风险.
- 现有的增强技术在有效性和应用方面可能存在局限性.
- 玻璃纤维增强聚合物 (GFRP) 复合材料为结构改造提供高强度与重量比.
研究的目的:
- 为了评估GFRP网格条带与喷聚氨结合的有效性,以加强URM墙壁.
- 调查GFRP条带方向和刚度对剪切能力和柔性的影响.
- 在对角压缩下分析加强URM墙壁的故障机制.
主要方法:
- 使用混凝土块和粘土建造URM墙壁.
- 应用水平和垂直导向的GFRP网格条带与喷的聚氨.
- 强化和不强化的墙壁被对角压缩负荷,直到故障.
主要成果:
- 在加强的URM墙壁中观察到切割能力和伪柔性显著改善.
- 垂直GFRP条纹大大提高了剪切性能,最大应变与轴度相关.
- 垂直条带的轴向刚度增加,将故障模式从关节故障转移到阻塞/故障.
结论:
- GFRP网格条有效地提高了URM墙壁的剪切能力和伪柔性.
- GFRP条的轴性刚度在性能和故障模式的改变中起着至关重要的作用.
- 建议在双面增强时使用降低因子,以解决潜在的不对称性能问题.
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