Development of Comprehensive Guidelines for Preprocessing Simulated Acceleration Time Histories

制定预处理模拟加速时程的综合指南

• 批准号: 0600262
• 负责人: Aspasia Zerva
• 金额: --
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-15 至 2010-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0600262&HistoricalAwards=false
• 关键词: Development; Comprehensive; Guidelines; Preprocessing; Simulated

AbstractAt the present time, the seismic response evaluation of lifeline systems incorporating spatial variability relies solely on simulated ground motions. Numerical (finite element) codes permitting spatially variable motions as excitations at the structures supports require displacement time histories as input excitations. Displacement time histories obtained through direct double integration of simulated acceleration time histories do not exhibit realistic waveforms, because, due to purely numerical reasons, accelerations can contain large random amplitude variability in the low frequency range. Hence, such simulated acceleration time histories also require preprocessing. There is, however, no agreed-upon approach for their preprocessing and the preprocessing scheme is left to the discretion of the investigator.This study will utilize recent developments in seismology, extend them to the specific needs of simulated and conditionally simulated time histories, and provide guidelines for their preprocessing. The following steps will be undertaken: (i) selection of commonly used simulation schemes from the ones available in the literature to be investigated in this study; (ii) application of state-of-the-art preprocessing schemes developed by the seismological community to simulated motions; and (iii) quantification of the results of step (ii) through the evaluation of the response statistics of a simple structural model subjected to spatially variable excitations. The development of the guidelines, along with user-friendly (MATLAB) codes will be posted on the World Wide Web for direct use by the community.

摘要目前，考虑空间变异性的生命线系统的地震反应评估仅依赖于模拟的地面运动。允许在结构支撑处作为激励的空间可变运动的数值(有限元)代码需要位移时间历史作为输入激励。通过对模拟的加速度时程直接进行二次积分得到的位移时程不能显示出真实的波形，因为纯粹由于数值原因，在低频范围内，加速度可能包含很大的随机幅度变异性。因此，这种模拟的加速度时间历史也需要进行预处理。然而，对于它们的预处理还没有达成一致的方法，预处理方案由研究人员自行决定。本研究将利用地震学的最新发展，将其扩展到模拟和条件模拟时程的特定需求，并为其预处理提供指导方针。将采取以下步骤：(I)从本研究要调查的文献中选择常用的模拟方案；(Ii)将地震界开发的最先进的预处理方案应用于模拟运动；以及(Iii)通过评估简单结构模型在空间可变激励下的响应统计来量化步骤(Ii)的结果。准则的制定以及用户友好的(MATLAB)代码将发布在万维网上，供社区直接使用。