对跨越冲滑断层的长跨度铁路缆索桥梁的非线性地震响应分析
Jin Zhang1,2, Xiang Liu3, Ya-Ting Cao3
1School of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, Sichuan, China. zhangjin18@cdut.edu.cn.
Scientific reports
|October 27, 2024
概括
这项研究模拟了跨越冲滑断层的桥梁的地震地面运动. 控制大位移变形对于活跃断层区域的地震桥梁设计至关重要.
科学领域:
- 地震工程的工程是地震工程.
- 结构工程 结构工程
- 地震学 地震学
背景情况:
- 在中国西部山区铁路附近的活跃断层对桥梁安全构成重大风险.
- 确保在复杂的地质环境中长跨度铁路桥梁的运行完整性至关重要.
研究的目的:
- 合成人工地面运动,用于跨越冲滑断层的桥梁.
- 在各种条件下分析这些桥梁的非线性地震反应.
主要方法:
- 开发了一种理论方法来模拟使用有限断层和等效速度脉冲模型的地震运动.
- 使用OpenSees构建了一个有线桥的非线性有限元模型.
- 评估地震响应,考虑交叉角度,地震振幅,导向性和抛动步效应.
主要成果:
- 交叉角度显著影响地震反应,纵向和横向方向的模式相反.
- 地震运动缩放因子极大地影响桥梁响应.
- 纵向响应显示出突然的位移增加;横向响应显示出由于飞效应的剩余位移.
结论:
- 桥梁塔和码头的曲率保持弹性,强调了管理大位移变形的重要性.
- 跨越冲滑断层的桥梁的地震设计必须优先控制大位移.
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