On the seismic behaviour of monolithic lunar arches subjected to moonquakes
On the seismic behaviour of monolithic lunar arches subjected to moonquakes
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月震作用下整体月拱的地震行为
DOI：
10.1002/eqe.3754
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发表时间：
2022
影响因子：
4.5
通讯作者：
Kalapodis N
中科院分区：
文献类型：
--
作者：
Kalapodis N
随着月球探测和居住领域出现的新时代，需要研究由当地土壤材料（风化层）制成的结构形式，这些结构形式将能够承受恶劣环境中的极端条件（例如，极端的温度波动、太阳和宇宙辐射、流星雨、强烈的地面运动等）。目前的工作重点是了解某些结构类型的整体拱的动力和抗震性能，通过有限元分析（FEA）。这些类型以前进行了广泛的研究，使用静态分析占月球上的重力场减少，并证明是对某些负载情况下的最佳形状。具体而言，本文研究的这些最佳整体拱形式（称为增强型变厚度拱-EVTA）通过变厚度几何形状来描述，在某些薄弱点适当增强以增加其结构稳定性。为了进行公平的比较，将EVTA的抗震性能与其相应的整体等厚度（CTA）对应物（具有相同数量的结构材料）进行对比。在确定了一个适当的损伤状态后，作者进行了初步的推覆分析，以确定拱的结构能力对横向荷载。随后，EVTA的模态分析表明，第二/垂直模式的固有周期几乎等于其第一/平移模式的固有周期，并且比CTA对应物的相应第二/垂直模式长得多，这表明沿垂直激励存在潜在的脆弱性沿着。此外，考虑到浅月震的危害潜力与板内地震相当，作者产生了一套随机地震激励作为地震分析的时间历程。定义的损坏状态的函数的峰值地面加速度（PGA）的概率，通过指示性的脆弱性曲线，EVTA相对于CTA同行的结构优越性进行了证明。
With a new era emerging in the field of lunar exploration and habitation, there is a need for research on structural forms made of local soil material (regolith), which will be able to endure the extreme conditions in harsh environments (e.g., extreme temperature fluctuations, solar and cosmic radiation, meteor showers, strong ground motions, etc.). The present work focuses on understanding the dynamic and seismic behaviour of certain structural typologies of monolithic arches by means of finite element analysis (FEA). These typologies were extensively investigated previously, using static analyses accounting for the reduced gravitational field on the moon, and proved to be of the optimum shape against certain loading scenarios. Specifically, these optimal monolithic arch forms (named enhanced varying‐thickness arches – EVTAs) examined herewith, are described by varying‐thickness geometry, properly enhanced at certain weak points for increasing their structural stability. Aiming at a fair comparison, the seismic behaviour of EVTAs is contrasted to that of their corresponding monolithic constant‐thickness (CTAs) counterparts (having the same amount of structural material). After defining an appropriate damage state, the authors conduct preliminary pushover analyses to determine the structural capacity of the arches against lateral loading. Subsequently, the modal analysis of the EVTAs shows that the second/vertical mode exhibits a natural period almost equal to that of their first/translational mode and substantially longer than the corresponding second/vertical mode of their CTA counterparts, indicating a potential vulnerability along the vertical excitation. Furthermore, taking into account that shallow moonquakes are comparable to intraplate earthquakes in terms of hazard potential, the authors produce sets of stochastic seismic excitations used as time histories for seismic analyses. The probability of exceedance of the defined damage state as a function of the peak ground acceleration (PGA) is presented through indicative fragility curves, where the structural superiority of EVTAs against their CTA counterparts is demonstrated.
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