Near-Source Ground Motion: Probabilistic Prediction of Accelerograms & Structural Demands

该项目旨在提高我们对近源强地面运动和极端结构响应的理解，以开发改进的强地面运动强度的矢量值测量，其将更紧密地对应于破坏结构的可能性。 特别是近源效应所带来的问题及其对非线性区域结构反应的后果将集中在这种效应可能导致比目前工程实践中与常用的强度测量（如谱加速度）相关联的更大的结构位移。 它们的工程应用意味着，这些运动的范围和不确定性，由于源，网站和路径效应的理解和表示，特别是在近断层区域。 这将导致非线性多自由度系统的动力响应的最佳预测，其可变性从可能的地震源。 本研究将结合工程学和地球科学的研究，并得到了美国国家科学基金会（NSF 98-36）第二年计划“美日城市地震减灾合作研究“的支持。

This project is aimed to improving our understanding of near-source strong ground motions and extreme structural response to develop improved vector-valued measures of strong ground motion intensity that will correspond more closely to the potential to damage structures. In particulalr, the problems posed by near source effects and their consequences for structural response in the nonlinear regime will be focussed on such effects may lead to substantially larger structural desplacements than current engineering practice associates with common measures of intensity, such as spectral acceleration.A major element of this research project will be improved prediction of near-source strong ground motions. Their engineering application implies that the range and undertainty in these motions due to source, site and path effects be understood and represented, particularly in the near-fault region. This will lead to optimal prediction of the dynamic response of nonlinear multi-degree-of-freedom systems, and its variabilty from likely earthquake sources. This cross-cutting ground motion and response research will be uniquely coordinated in the context of the larger objective of practical probabilistic performance estimation.This project involves integration of engineering and earth science investigation and is supported under the second year initiative "US-Japan Cooperative Research in Urban Earthquake Disaster Mitigation, " NSF 98-36