《Earthquake Engineering and Structural Dynamics》杂志刊登“时程响应分析中频谱匹配的地震动适应性评价”
作者:Damian N. Grant, Riccardo Diaferia
刊物:《Earthquake Engineering and Structural Dynamics》,2013年,42卷第9期,1265—1280页
关键词:响应频谱匹配;地震波的缩放与修正
摘要:响应谱匹配法是利用与场地目标谱相匹配的响应谱生成地震波的一种方法。在一些文献中,对频谱匹配得到的地震动是否会造成最终结构分析结果的偏差存在争论。此外,也没有客观和定量的标准来支持地震动是否真的极度依赖于匹配谱,大的地震波修正是否会导致最终结果的偏差。基于上述问题,本文对此进行了讨论并采用两个钢筋混凝土结构框架模型和两个场地波(一个是匹配的,一个是未匹配的)对两种结构响应结果进行了分析。通过对比分析表明,频谱匹配并不会造成结果的重大偏差。通过研究匹配谱中应用的周期范围和目标阻尼值发现,匹配基频率提高3倍,可以有效减少结果偏差。最后,利用分析结构研究了地震波的大修正是否会导致结果的偏差;同时分析了包括地震波绝对峰值、累计平方和地震动(绝对的或标准的)和单自由度系统输入能等在内的许多潜在的改变措施。虽然分析结果与这些改变措施之间的系统性和统计上的相关性未能找到,但初步的标准得到了提高,使用该标准可以分析确定通过频谱匹配得到的地震波是否可以接受。
Assessing adequacy of spectrum-matched ground motions for response history analysis
Authors: Damian N. Grant, Riccardo Diaferia
Journal: Earthquake Engineering and Structural Dynamics, Volume 42, Issue 9, pages1265-1280, 25 July 2013
Key words: response spectrum matching; ground motion scaling and modification
Abstract: Response spectrum matching is commonly used to generate ground motions with response spectra matching a scenario target spectrum. There is some debate in the literature about whether spectrum-matched motions lead to biased structural analysis results. Furthermore, there are no objective, quantitative criteria available for deciding whether a ground motion has been manipulated excessively by spectrum matching, and whether large modification may also lead to bias. This study investigates both of these issues by presenting the results of structural analysis using two reinforced concrete moment frame models and two earthquake scenarios, with suites of unmatched and matched ground motions. Through comparison with a robust benchmark, it is shown that no significant bias is introduced by spectrum matching. The period range and target damping values for matching are also investigated, and matching up to three times the fundamental period is shown to be beneficial in reducing dispersion in the results. Finally, these analyses were also used to investigate whether large changes in the ground motion lead to biased analysis results. Several potential measures of change are investigated, including those based on peak absolute ground motion, cumulative squared ground motion (absolute or normalized), and input energy into single-degree-of-freedom systems. Although no systematic, statistically significant correlation is found for the analysis results in terms of any of these measures of change, tentative criteria are proposed, which may be used by analysts to aid in the decision of whether to accept or reject a spectrum-matched motion.
原文链接:http://onlinelibrary.wiley.com/doi/10.1002/eqe.2270/abstract
翻译:徐金英;审核:安鹏