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Sensitivity analysis of double layer Diamatic dome space structure collapse behavior
Engineering Structures ( IF 5.5 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.engstruct.2020.110511
R. Vaezi Vazna , M. Zarrin

Abstract Collapse behavior of double layer dome space structures depends on different factors such as load pattern, material mechanical properties, and member’s physical characteristics, which have a random nature that makes it difficult to predict accurate behavior of this type of structure. In this paper, in order to comprehensively assess the double-layer dome space structure behavior, different uncertain parameters such as the mechanical characteristics of steel material, mass and applied gravity load, and also structure’s and members’ geometric imperfection are taken into account in nonlinear static pushover analysis. Different models with rise to span (R/S) ratios of 0.1, 0.2, and 0.3 under incremental symmetric and asymmetric snow loads are investigated. In order to determine the importance of these uncertain parameters and rank them according to their effects on the structural response parameters, two different methods of Tornado Diagram Analysis (TDA) and First-Order-Second-Moment (FOSM) are utilized. Using these methods enables the sensitivity analysis of the collapse behavior of the structures to the considered random variables. The results of the analyses reveal that there is a close agreement between the TDA and FOSM analyses results in ranking the random variables according to their importance. In addition, these methods highlight the high sensitivity of the structural response parameters to the various sources of uncertainty, and indicate the necessity of applying these uncertainties in the analysis and design of this type of structure.

中文翻译:

双层Diamatic穹顶空间结构倒塌行为敏感性分析

摘要 双层穹顶空间结构的倒塌行为取决于荷载模式、材料力学性能和构件物理特性等不同因素,这些因素具有随机性,难以准确预测此类结构的倒塌行为。本文为了综合评估双层穹顶空间结构行为,在非线性分析中考虑了钢材的力学特性、质量和外加重力荷载,以及结构和构件的几何缺陷等不同的不确定参数。静态推覆分析。研究了在增量对称和非对称雪荷载下具有 0.1、0.2 和 0.3 的上升跨度 (R/S) 比的不同模型。为了确定这些不确定参数的重要性并根据它们对结构响应参数的影响对它们进行排序,使用了两种不同的龙卷风图分析 (TDA) 和一阶二阶矩 (FOSM) 方法。使用这些方法可以对结构的倒塌行为对所考虑的随机变量进行敏感性分析。分析结果表明,TDA 和 FOSM 分析结果在根据随机变量的重要性对随机变量进行排序时非常一致。此外,这些方法突出了结构响应参数对各种不确定性来源的高度敏感性,并表明在此类结构的分析和设计中应用这些不确定性的必要性。
更新日期:2020-06-01
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