对带FRP杆的外部预应力梁的评估,考虑到债券滑动效应
Zhangxiang Li1,2, Bo Chen1,2, Xueliang Wang1,2
1Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572025, China.
Materials (Basel, Switzerland)
|February 26, 2025
概括
这项研究将外部预应力混凝土 (EPC) 梁与纤维增强聚合物 (FRP) 钢筋模拟为模型,揭示了由于粘合滑动效应的显著应力降解. 传统的设计方法对于这些先进的复合结构是不够的.
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:
- 外部预应力混凝土 (EPC) 梁越来越多地用于基础设施.
- 纤维增强聚合物 (FRP) 钢筋比传统的钢筋更有优势.
- 了解FRP和混凝土之间的粘合滑动行为对于准确的结构分析至关重要.
研究的目的:
- 开发和验证一个详细的3D有限元模型 (FEM) 用于带FRP钢筋的EPC梁.
- 为了研究债券滑动相互作用及其对FRP钢筋应力的影响.
- 评估现有的设计代码的准确性,以预测最终的肌应力.
主要方法:
- 在ABAQUS中开发了精细的3D FEM,其中包含了FRP混凝土粘合滑动行为的脚本.
- 使用实验数据验证FEM以确保界面行为的准确性.
- 使用FEM分析碳纤维增强聚合物 (CFRP) 肌-EPC梁的机械行为的参数研究.
主要成果:
- FEM准确地捕捉到FRP钢筋和混凝土之间的粘合滑动行为.
- 在EPC梁中的FRP钢筋由于结合滑动效应而表现出显著的应力降解.
- 传统的平面截面假设对于设计使用FRP钢筋的EPC梁是不够的.
结论:
- 开发的FEM提供了一种可靠的工具,用于分析FRP钢筋的EPC梁.
- 债券滑动现象需要对这些结构进行修订的设计方法.
- 当前的设计规范在预测肌应力方面可能过于保守,需要进一步改进.
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