用于轴负载RC柱的薄HPFRC外套:机械行为和加强效率
Maria Dolores Criado Fernández1,2, Sonia Martínez de Mingo2, Ana Almerich-Chulia3
1Doctoral School, Universitat Politècnica de València, 46022 Valencia, Spain.
Materials (Basel, Switzerland)
|January 28, 2026
概括
高性能纤维增强混凝土 (HPFRC) 覆盖有效地加强了钢筋混凝土 (RC) 柱子. 这种可持续的解决方案显著提高了轴承负载能力,特别是对于非圆形柱子,没有爆炸性故障.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 结构工程 结构工程
背景情况:
- 建筑业对环境的影响需要延长现有结构的使用寿命.
- 钢筋混凝土 (RC) 柱子通常需要加强以满足当前负载需求或修复损坏.
- 可持续和高效的强化方法对于基础设施的寿命至关重要.
研究的目的:
- 调查高性能纤维增强混凝土 (HPFRC) 覆盖在轴向压缩下加强RC柱的有效性.
- 评估横截面形状 (圆形,方形,矩形) 对HPFRC增强柱的性能的影响.
- 将HPFRC外套与其他增强技术进行比较,并评估其改善结构性能和安全的潜力.
主要方法:
- 测试了12个不同横截面形状 (圆形,方形,矩形) 和1200毫米高的RC柱.
- 柱子使用薄的HPFRC外套 (厚度小于30毫米) 进行了增强,并进行了简单的表面准备 (喷砂).
- 分析了强化和非强化柱的轴承负载能力和故障模式.
主要成果:
- 全身高的HPFRC外套在所有测试的横截面形状上显著增加了轴承负载能力.
- 与对照样本相比,方形柱子的轴承容量增加了105%,而矩形柱子的轴承容量增加了87%.
- 最高的性能增长 (双重轴承容量) 观察到的是一个有全高度外套和52.6%的几何强化比率的方形柱子.
- 加强的柱子呈现渐进式故障,在崩之前提供警告,与爆炸式故障模式不同.
结论:
- HPFRC外套是一种高度有效的方法,可以提高RC柱的轴承负载能力,特别是非圆形柱.
- 增强效率与几何增强比率直接相关,并不会因截面形状而减少.
- HPFRC外套为传统方法提供了一个可持续的替代方案,可能会超过纤维增强聚合物 (FRP) 外套,并且无需额外的保护层.
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