Optimal arch forms under in-plane seismic loading in different gravitational environments
Optimal arch forms under in-plane seismic loading in different gravitational environments
复制标题
不同重力环境下面内地震荷载下的最佳拱形
DOI：
10.1002/eqe.3626
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发表时间：
2022
影响因子：
4.5
通讯作者：
Málaga-Chuquitaype C
中科院分区：
文献类型：
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作者：
Málaga-Chuquitaype C
本文的动机是对太空探索的新兴趣，以及为有价值的资产和未来的可居住模块提供结构合理和资源高效的屏蔽解决方案的需求。我们提出、实施并测试了一种用于初步设计和评估承受自重和地震荷载的最佳拱形的方法。数值框架，建立在一个极限推力线分析，以前出版的作者，首先进行了总结。随后详细介绍了变厚度拱的找形算法。特别注意我们的假设的物理可行性和工程输入的理由。与恒定最小厚度的圆形或椭圆形拱相比，新形成的拱的材料效率在10%到50%之间，具体取决于地震作用的相对强度。还评估了初始输入几何形状的影响和额外屏蔽材料对极端辐射的稳定存在，重点是低重力条件的影响。最后，给出了一个案例研究，并在一组有代表性的月球地面运动下评估了恒定和变厚度拱（VTA）的离散元模型。恒定厚度拱（CTA）的显着过度保守是显而易见的，并强调了最佳拱形状的潜在改进。虽然开发与外星应用的想法，我们在这里提出的结果和方法也适用于地球上的条件时，材料效率是最重要的关注。
This paper is motivated by the renewed interest in space exploration and the need to provide structurally sound and resource‐efficient shielding solutions for valuable assets and future habitable modules. We present, implement and test a methodology for the preliminary design and assessment of optimal arch forms subjected to self‐weight as well as seismically induced loads. The numerical framework, built around a limit thrust‐line analysis, previously published by the authors, is summarized first. This is followed by a detailed account of the form‐finding algorithm for arches of variable thickness. Special attention is placed on the physical feasibility of our assumptions and the justification of the engineering inputs adopted. The newly form‐found arches achieve material efficiencies between 10% and 50% in comparison with their constant minimum‐thickness circular or elliptical counterparts, depending on the relative intensity of the seismic action. The influence of the initial input geometry and the stabilising presence of additional shielding material against extreme radiation are also evaluated with emphasis on the effects of low‐gravity conditions. Finally, a case study is presented and Discrete Element Models of constant and varying thickness arches (VTAs) are assessed under a set of representative ground‐motions on a lunar setting. The significant over‐conservatism of constant thickness arches (CTAs) is made manifest and potential improvements of the optimally found arch shape are highlighted. Although developed with extraterrestrial applications in mind, the results and methods we present herein are also applicable to terrestrial conditions when material efficiency is of utmost concern.