基于可靠性的设计优化,用于在韩国海洋环境下的多个极限状态方程的垂直型分水,在韩国海洋环境下从海到海有所不同
1Department of Civil Engineering, University of Seoul, Seoul, Korea. young@uos.ac.kr.
Scientific reports
|April 20, 2024
概括
这项研究利用可靠性分析优化了韩国的垂直式断水器设计. 它通过开发概率波模型,通过改进基于可靠性的设计的实际应用,确保跨站点的一致的故障概率.
科学领域:
- 土木工程 土木工程是指土木工程.
- 海洋工程 海洋工程
- 结构可靠性 结构可靠性
背景情况:
- 由于复杂的系数计算和假设,韩国防波堤的基于可靠性的设计 (RBD) 尚未得到充分利用.
- 现有的方法通常依赖于简化的概率模型 (例如,高斯分布) 和特定的返回周期设计波,限制了实际应用.
- 准确的负载和阻力系数对于实际的RBD和增强突破口完整性至关重要.
研究的目的:
- 在代表性的韩国港口,对垂直式断水器进行基于可靠性的最佳设计.
- 为了提高实际设计应用的负载和阻力系数的准确性.
- 促进在韩国采用未充分利用的基于可靠性的设计方法.
主要方法:
- 使用双循环方法与Polak-He优化算法同时实现可靠性和优化.
- 采用子集模拟来减轻双循环方法的计算需求.
- 从长期的现场波浪数据直接开发波浪力,提升力和翻转矩的概率模型,避免特定的返回周期和线性模型.
主要成果:
- 仅仅考虑滑动故障与全面的极限状态分析 (滑动,翻转,崩) 相比,低估了实际故障概率.
- 使用特定回归期的设计波并不能保证在不同海域的故障概率一致.
- 在所有研究的韩国海域中,满足3.5-4的可靠性指数 (β) 的最佳设计的分水始终实现目标失败概率.
结论:
- 提出的基于可靠性的设计优化提供了一个更简单,更实用的方法,与奥卡姆的剃须刀保持一致.
- 使用现场数据准确地描述波浪和提升力的不确定性,对于现实的断水器可靠性评估至关重要.
- 通过拟议的方法,可以实现一致的目标失败概率,从而提高韩国垂直型分水的可靠性和安全性.
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