基于自然频率的桥梁扩张关节损伤的实验研究
Junshi Li1, Feng Wen1, Jun Chen1
1School of Civil Engineering, Xiangtan University, Xiangtan 411105, China.
加速传感器是测试模态桥梁扩张接头的最佳选择. 自然频率随着混凝土固化时间的增加而增加,随着损坏而减少,关节组件的灵敏度各不相同.
科学领域:
- 土木工程 土木工程是指土木工程.
- 结构健康监测 结构健康监测
- 实验力学 实验力学 实验力学
背景情况:
- 模态桥梁扩张接头是确保桥梁完整性的关键组件.
- 评估这些关节的结构健康需要可靠的监测技术.
- 了解环境因素和损害对联合动态的影响至关重要.
研究的目的:
- 为了比较加速和光纤应变传感器的有效性,用于模态桥梁扩张关节测试.
- 研究混凝土固化期对这些关节的自然频率的影响.
- 分析局部损伤对不同关节组件自然频率的影响.
主要方法:
- 使用三种模式桥梁扩展联合标本进行实验调查.
- 加速传感器与光纤应变传感器的比较.
- 在混凝土固化过程中 (3至28天) 分析自然频率变化.
- 对中梁,支杆和固定区混凝土引入受控损伤.
- 冲击激发和模式分析.
主要成果:
- 加速传感器在模态桥扩展联合测试中表现出卓越的性能.
- 自然频率的显著增加 (大约. 10 Hz) 从混凝土固化的第3天到第28天观察到.
- 中梁和支杆的逐渐损坏导致自然频率的下降趋势.
- 对固定区混凝土的损伤表现出较少明显的变化,但仍然导致总体自然频率的下降.
- 不同的关节部件对损伤的频率灵敏度各不相同.
结论:
- 推加速度传感器用于模态桥梁扩建的联合监测.
- 混凝土固化显著影响了桥梁扩张接头的自然频率.
- 桥梁扩张接头的损坏检测可以通过模态分析实现,灵敏度根据损坏的位置和类型而异.
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