面向欧洲的风险向性地震危险模型
Giorgio Monti1,2, Cristoforo Demartino3,4, Paolo Gardoni5
1College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang, People's Republic of China.
Scientific reports
|July 3, 2023
概括
当前的地震设计规范在不同地区造成不平等的风险. 本研究提出了针对风险的地震设计的新框架,确保新建和现有建筑物具有统一的地震风险.
科学领域:
- 地震工程的工程是地震工程.
- 地震学 地震学
- 风险评估 风险评估
背景情况:
- 地震设计代码经常使用统一的危险地图,导致非均的极限状态 (LS) 超值概率和不同区域的地震风险不均.
- 这种差异源于用于估计故障概率的容量和需求模型,影响新建和现有结构.
研究的目的:
- 为统一的地震风险制定地震概率评估公式和风险向强度指标.
- 引入一个框架,考虑到结构性产能过剩或产能不足相对于基于代码的需求.
- 将框架应用于欧洲的地面加速峰值,并为设计代码推导基于风险的修改因子.
主要方法:
- 开发了一个地震概率评估,使用线性模型在日志-日志坐标的危险,假设日志-正常的容量和需求.
- 引入了一个因子来调整基于危险的需求对结构容量变化的代码.
- 将框架应用于欧洲高峰地面加速,并计算了风险目标水平和修改因子.
主要成果:
- 该研究确定了欧洲新建和现有建筑物高峰地面加速 (PGA) 的风险目标水平.
- 导出基于风险的强度和平均回报期修改因子,用于在设计标准中实施.
- 确定了欧洲的重要区域,设计PGA应该增加,特别是对于现有建筑.
结论:
- 拟议的框架使风险准的地震设计成为可能,在各个地区实现统一的极限状态超值概率.
- 欧洲目前的地震设计实践可能需要增加设计PGA以满足统一的风险目标,特别是对于现有建筑物.
- 开发的修改因子提供了一种实际的方法来提高地震安全,并通过更新的标准实现统一的风险.
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