电压后梁的数值模拟 冲动下的行为 负载力 负载力
1Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 gen. Sylwestra Kaliskiego Street, 00-908 Warsaw, Poland.
Materials (Basel, Switzerland)
|December 11, 2025
概括
数字模拟显示,后应力梁在恒定力冲动负载下表现出降低的动态负载能力,但在时间变化的负载下显著增强能力,受预应力离心率的影响.
科学领域:
- 结构工程 结构工程
- 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:
- 后拉伸梁是关键的结构元素.
- 了解它们在冲动负载下的动态行为对于安全至关重要.
- 之前的研究集中在静态或不同的动态负载条件上.
研究的目的:
- 在两种不同的冲动负载类型下,数值模拟和分析后张束的动态行为.
- 为了研究预应力异常度对动态负载能力的影响.
- 为了比较动态和静态负载能力.
主要方法:
- 使用Abaqus程序进行详细的数值模拟.
- 采用了混凝土损伤可塑性和约翰逊-库克材料行为模型.
- 使用实验和静态分析数据校准动态模型.
- 通过明确的程序解决动态平衡方程.
主要成果:
- 与静态测试相比,恒定力冲动负载导致动态负载能力下降5%左右.
- 短期,时间变化的冲动负载显著增加了动态负载能力.
- 更高的预应力离心率导致更大的动态负载能力 (211%的静态).
结论:
- 冲动负载的类型极大地影响了后拉伸梁的动态负载能力.
- 时间变化的冲动负载可以大幅提高结构性能,超出静态预测.
- 预应力离心率是影响动态响应和容量的关键参数.
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