Development of spatial correlation and coherency model for simulating tri-directional ground motion fields at the dam-foundation interface

开发模拟坝基界面三向地震动场的空间相关性和相干性模型

• 批准号: 485380-2015
• 负责人: Hong, Hanping
• 金额: $ 1.82万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=584911
• 关键词: Development; spatial; correlation; coherency; model

Structures and infrastructure with large footprints, including dams, are affected by spatially varying multi-component ground motions. The tri-directional ground motions at multiple supports or the ground motion fields at the dam-foundation interface can be simulated for given spatial coherency and tri-component response spectra specified at given probability level (i.e., seismic hazard). However, information on spatial coherency for tri-directional ground motions is unavailable. Moreover, the seismic hazard modeling is sensitive to the standard deviation and the (intra-event) spatial correlation of the residuals of the ground motion prediction equations (GMPEs), which are usually estimated based on records from a broad network of recording stations with a minimum distance between the stations more than about one kilometer. The application of the GMPEs together with their residuals derived using such records is adequate if the minimum distance between the supports of the infrastructure is similar to those of the records. However, one must investigate what are the most appropriate GMPEs, if the interest is focused on estimating the seismic hazards at multiple supports within a localized area, such as dam base. This proposal is to assess the probabilistic model of ground motion measures and seismic hazard that are applicable to a localized area, and to develop empirical spatial coherency model by considering multi-directional ground motions. For the analysis, the ground motion records from the dense arrays with short station-to-station distance will be employed. The developed probabilistic models of ground motion measures and the spatial coherency models are used as the basis for simulating tri-directional ground motions at multiple supports within a localized area or at the dam-foundation interface. The algorithm developed in this project is useful to assess seismic risk of dams, and could be integrated as part of HATCH's risk-based tools for evaluating dam safety and for prioritizing long-term safety maintenance program. The funding from NSERC for this project is to be used to support a post-doctoral fellow for six months.

占地面积大的结构和基础设施，包括水坝，会受到空间变化的影响 多分量地震动。多点支承或地面上的三向地震动 对于给定的空间相干性和三分量，可以模拟坝基交界面处的运动场 在给定概率水平(即地震危险性)下指定的反应谱。然而，关于空间的信息 三向地面运动的一致性不可用。此外，地震危险性模拟是敏感的。 地震动残差的标准差和(事件内)空间相关性 预测方程(GMPE)，通常基于来自广泛网络的记录进行估计 记录站与记录站之间的最小距离约为一公里。这个 应用GMPE及其使用此类记录得出的残差是足够的，如果最低 基础设施支撑物之间的距离与记录中的相似。然而，一个人必须 调查什么是最合适的GMPE，如果兴趣集中在评估地震危险性上 局部区域内的多个支撑物，如坝基。 这项建议是为了评估地面运动测量和地震危险性的概率模型 适用于局部区域，并通过考虑以下因素建立经验空间一致性模型 多方向地震动。对于分析，从密集的地震台阵记录的短波 将采用车站到车站的距离。地震动量测概率模型的发展 并以空间相干模型为基础，模拟了三向地震动。 支承在局部区域内或在坝基交界处。本项目开发的算法是 对评估大坝的地震风险很有用，可以作为Hatch基于风险的工具的一部分进行集成 评估大坝安全并确定长期安全维护计划的优先顺序。 NSERC为该项目提供的资金将用于支持一名博士后六个月。