基于高阶光束理论的混凝土损伤分析,使用断裂能量调节
J Shen1, M R T Arruda2, A Pagani1
1Mul2 Group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Torino, Italy.
Mechanics of advanced materials and structures
|November 28, 2023
概括
本研究介绍了使用高阶束理论对混凝土结构的数值损伤分析. 这种先进的模型准确地预测了结构性行为,降低了计算成本和网格依赖性.
科学领域:
- 土木工程 土木工程是指土木工程.
- 计算力学 计算力学 计算力学
- 材料科学 材料科学 材料科学
背景情况:
- 混凝土结构需要准确的数值损伤分析来预测性能.
- 高阶光束理论比经典方法提供了更好的准确性.
- 卡雷拉统一配方 (CUF) 为结构分析提供了一个多功能框架.
研究的目的:
- 通过使用基于CUF的更高阶光束理论,对混凝土结构进行数值损伤分析.
- 用连续损伤力学和修改的马扎尔斯模型来建模混凝土的构成性行为.
- 提出一种用于高阶光束理论中估计特征长度的方法,以避免网格依赖.
主要方法:
- 用Carrera统一表述 (CUF) 进行高阶束理论.
- 采用连续损坏机制,使用修改后的马扎尔斯混凝土损坏模型.
- 纳入了经典骨折能量方法来规范软化行为.
- 估计的特征长度,以确保网格独立的结果.
- 通过对三个基准准静态实验测试来验证模型.
主要成果:
- 拟议的CUF模型准确地模拟了混凝土损坏.
- 该模型展示了与传统方法相比显著降低计算成本的3D准确性.
- 开发的方法有效地减少了在数值模拟中的网格依赖.
- 数字结果与实验数据有很好的一致性.
结论:
- 基于CUF的连续损伤力学模型对于分析混凝土结构非常有效.
- 提出的方法可以实现高精度,同时最大限度地减少计算资源.
- 该方法成功地解决了在高阶光束分析中的网格依赖问题.
- 这项工作为混凝土结构的数值损伤分析提供了可靠的工具.
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