Seismic Response of Long-Span Domes Supported by Multi-Storey Substructures
Seismic Response of Long-Span Domes Supported by Multi-Storey Substructures
复制标题
多层下部结构支撑大跨度穹顶的地震响应
DOI：
10.20898/j.iass.2020.204.007
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
T. Takeuchi
中科院分区：
文献类型：
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作者：
Deepshikha Nair;Yuki Terazawa;B. Sitler;T. Takeuchi
本文研究了大跨度穹顶结构的地震反应特性。主振型的自振周期比中跨穹顶的周期长，导致高阶振型对大跨穹顶结构响应的贡献更大。加速度分布，
特别地，垂直加速度分布对这些高阶模态的主导模态形状敏感。这导致在应用先前提出的响应评估方法时不准确。多层支承下部结构的振型也会影响结构的激振力
屋顶的振动模式。本文研究了150m跨多层支承穹顶结构的动力特性和地震反应。本文还分析了多层下部结构屈服后刚度的影响，
屈曲约束支撑框架（BRBF）和阻尼脊柱框架。基于反应谱分析和等效线性化方法，提出了一种利用放大系数和考虑高阶振型影响的等效静力荷载的简单设计方法。
所提出的方法的准确性进行评估，通过比较从非线性响应历史分析得到的响应。
This paper investigates the seismic response characteristics of long-span domes. The natural periods of the prominent modes are longer than medium-span domes, which leads to a greater contribution from the higher modes to the response of the long-span dome. The acceleration distributions,
particularly the vertical acceleration distributions are sensitive to the dominant mode shapes of these higher modes. This leads to inaccuracies when applying the previously proposed response evaluation methods. The vibration modes of multi-storey supporting substructures also affect the excited
vibration modes of the roof. In this paper, the dynamic characteristics and seismic response of 150m-span domes supported by multi-storey substructures are studied. The effects of the post- yield stiffness of multi-storey substructures are also analysed by considering two structural systems,
buckling- restrained braced frames (BRBF) and damped spine frames. A simple design procedure to evaluate the equivalent static loads using amplification factors and incorporating the effects of higher modes is proposed based on response spectrum analysis and equivalent linearisation procedures.
The accuracy of the proposed method is evaluated by comparing the responses with those obtained from non-linear response history analysis.