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首页> 外文期刊>KSCE journal of civil engineering >Studying Higher Mode Effects on the Performance of Nonlinear Static Analysis Methods Considering Near-Fault Effects
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Studying Higher Mode Effects on the Performance of Nonlinear Static Analysis Methods Considering Near-Fault Effects

机译：考虑近故障效应的非线性分析方法性能对高模效应的研究

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Daily development in civil engineering arena and the importance of economical aspects in the design of structures have motivated the engineers to shift their approaches from designing upon strength to designing upon performance. This is of more importance regarding the forces induced by earthquakes which have unpredicted and random nature. However, it is not possible to design or assess exactly the structural performance against strong ground motion using analytical methods which are applied for static loads and therefore precise dynamic analysis methods are needed. Despite significant progress in the analytical methods and engineering software, using nonlinear time history analysis is vety difficult for engineers and designers due to unpredictable nature of future ground motions as well as complicated behaviour of structures. Consequently, the substituting methods are presented upon nonlinear static analysis. Coefficient method and capacity spectrum method, presented by FEMA356 and ATC40, respectively, are of this kind that have been used in the recent years and modified by newer documents such as FEMA440. Despite acceptable results, neglecting some important items, such as higher mode effects which can be decisive in tall and specific structures, made offering other procedures like Modal Pushover Analysis (MPA). In this study, the performance abilities of nonlinear static methods are studied in order to assess the dynamic response of structures under both far- and near-fault earthquake records. For this purpose, two reinforced concrete frames of 5 and 15 stories are analyzed by a series of nonlinear static and dynamic analyses. Analysis results show that conventional nonlinear static analysis methods cannot estimate accurately the deformation demands of tall building structures, particularly in the higher stories, due to the effects of higher modes. Although MPA method has almost improved the results, yet it has not high accuracy regarding near-fault earthquake records.
机译：土木工程领域的日常发展以及结构设计中经济方面的重要性促使工程师将其方法从强度设计转变为性能设计。对于由地震引起的具有不可预测和随机性质的力而言，这更为重要。但是，不可能使用适用于静态载荷的分析方法来精确设计或评估针对强地面运动的结构性能，因此需要精确的动态分析方法。尽管在分析方法和工程软件方面取得了长足的进步，但由于未来地面运动的不可预测性以及结构的复杂性，使用非线性时程分析对于工程师和设计人员来说是非常困难的。因此，提出了基于非线性静力分析的替代方法。分别由FEMA356和ATC40提出的系数法和容量谱法是近年来使用的这类方法，并已由FEMA440等较新的文档进行了修改。尽管结果令人满意，但忽略了一些重要的事项，例如较高的模态效应（可能对高层结构和特定结构起决定性作用），因此提供了其他方法，如模态下垂分析（MPA）。在这项研究中，研究了非线性静态方法的性能，以评估远，近断层地震记录下结构的动力响应。为此，通过一系列非线性静态和动态分析来分析5个和15个楼层的两个钢筋混凝土框架。分析结果表明，由于较高模态的影响，传统的非线性静力分析方法无法准确估算高层建筑结构的变形需求，尤其是在高层建筑中。尽管MPA方法几乎可以改善结果，但是对于近断层地震记录而言，其准确性不高。

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