关于对长跨度和不对称悬架桥的动态响应分析的研究,该桥受到均和不均的地面运动的影响
1Chengdu Jincheng College, Chengdu, China.
Science progress
|May 19, 2025
概括
这项研究表明,对大跨度吊桥的地震分析必须考虑移动波效应和材料非线性. 忽视这些因素大大低估了地震对桥梁移位和力量的影响.
科学领域:
- 土木工程 土木工程是指土木工程.
- 地震工程的工程是地震工程.
- 结构动力学 结构动力学
背景情况:
- 大跨度不对称吊桥是易受地震危害的关键基础设施.
- 在复杂的地震输入下了解它们的动态反应对于安全至关重要.
研究的目的:
- 在空间变化的地震运动下研究大跨度不对称悬浮桥的动态反应.
- 评估移动波效应和材料非线性对结构性能的影响.
主要方法:
- 使用SAP2000.一个代表性桥梁的3D有限元模型被开发出来.
- 主电缆的内置曲效应,土相互作用,以及通过塑料链的材料非线性.
- 在空间变化的地震激发下进行非线性时间历史分析.
主要成果:
- 空间变化的地震运动和材料非线性增加了基础剪切力和曲矩.
- 峰值位移被显著放大 (大约. 1.61-1.64倍) 在考虑移动波效应和材料非线性时.
- 塔底部的材料非线性降低了位移反应,而悬挂杆轴力由于更高阶模式而增加.
结论:
- 忽视移动波效应和材料非线性导致低估吊桥对地震需求.
- 准确的地震设计需要综合分析,考虑到这些复杂的因素.
- 结果为弹性大跨度不对称悬浮桥的工程和设计提供了宝贵的见解.
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