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Cantilever beam analogy for modal analysis of rocking core-moment frames

机译:悬臂梁类比,用于摇摆核心时刻框架的模态分析

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摘要

Unlike conventional seismic resisting systems, rocking core-moment frame (RCMF) combinations as low-damage assemblies are being developed to mitigate, or even eliminate structural damage and residual deformations following a severe earthquake. Despite extensive studies on the performance of specific rocking cores, dynamic characteristics and strength demands of a generic RCMF have not been addressed. By utilizing cantilever beam analogy, the current article proposes a modal analysis method to formulate RCMF demands. The proposed model and obtained analytical charts provide a manual method for rapid study and preliminary design of low- to mid-rise RCMFs with relatively uniform properties over the height. An extensive parametric study investigates the effects of rocking core base-fixity and frame-to-core stiffness on demand values. An independent computer analysis verifies the validity and accuracy of the proposed formulas. Findings show significant higher-mode effects in several RCMF combinations.
机译:与传统的地震抗震系统不同,正在开发出作为低损伤组件的摇摆核心框架(RCMF)组合以减轻或甚至消除严重地震后的结构损坏和残留变形。尽管对特定摇摆核心的性能进行了广泛的研究,但尚未解决通用RCMF的动态特性和强度需求。通过利用悬臂梁类比,目前的文章提出了模态分析方法来制定RCMF要求。所提出的模型和获得的分析图表提供了一种用于快速研究和初步设计的手动方法,其低至中层RCMF具有相对均匀的高度的特性。广泛的参数研究调查了摇摆芯基 - 固定度和框架到核心刚度对需求值的影响。独立的计算机分析验证了所提出的公式的有效性和准确性。调查结果显示了几种RCMF组合中的显着更高模式效果。

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