使用有限元素方法对堆基础进行非线性动态分析
Tewodros Goshu1, Eleyas Assefa1, Nagessa Zerihun Jilo2
1Department of Civil Engineering, College of Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia.
Scientific reports
|October 24, 2025
概括
在地震区的基需要进行非线性动态分析. 这项研究发现,虽然桥梁B-40
科学领域:
- 地质技术工程 地质技术工程
- 地震学 地震学
- 结构工程 结构工程
背景情况:
- 埃塞俄比亚的高地震风险需要对基础设施进行强有力的评估,特别是对基的基础.
- 在像阿法三角 (Afar Triangle) 这样的地震活跃地区,土壤 - 堆 - 结构的相互作用对于安全和可用性至关重要.
研究的目的:
- 为了对埃塞俄比亚地震活跃的阿法三角的B-40桥的基进行非线性动态响应分析.
- 在静态和动态负载条件下评估基的抗震性能和可用性.
主要方法:
- 使用了PLAXIS 3D有限元素软件,包括硬化土壤和Hoek-Brown构成模型.
- 嵌入特定地点的地质技术和地震数据 (PGA = 0.3 g) 用于静态和动态模拟.
- 进行了自由场现场响应和自由振动分析,以确定自然频率和地震放大.
主要成果:
- 静态分析表明沉积量微不足道 (0.55毫米),压力远低于容量.
- 动态分析显示头位移为91.24毫米,在结构限制内,但立即结算 (95.81毫米) 超过了欧元代码的可用性标准.
- 不同结算很低 (3.5-4.95毫米),垂直应力仍然低于故障极限.
结论:
- 尽管足够稳定,但堆基础由于在地震负荷下超过了结算标准,因此存在可用性问题.
- 在地震地区,非线性土壤行为对于准确的堆基础设计至关重要.
- 该研究强调,需要严格评估高风险地震区域内的基础设施项目的非线性动态反应.
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