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首页> 外文期刊>Bulletin of earthquake engineering >Finite element methodology for the evaluation of soil damping in LNG tanks supported on homogeneous elastic halfspace
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Finite element methodology for the evaluation of soil damping in LNG tanks supported on homogeneous elastic halfspace

机译：均质弹性半空间支撑的LNG储罐土壤阻尼评估的有限元方法

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Influence of foundation conditions and typology in above-ground full containment liquefied natural gas (LNG) storage tank design makes it necessary to evaluate its structural response due to dynamic actions. Typical above-ground full containment LNG storage tanks are constituted of an outer tank made of reinforced and pre-stressed concrete, which provides support, protection and secondary containment in case of failure of the inner tank and a 9 % Ni steel inner tank, which acts as principal and main containment. Conceptual description of full containment LNG storage tanks is included in applicable normative EN 14620-1. Foundation is a structural element, which acts as a dynamic excitation transmitter in case of earthquakes and modifies structure response. This effect is known as soil-structure interaction due to dynamic energy exchange, which affects the overall structural response. The soil-structure interaction under seismic loads has been implemented on the LNG storage tanks for, at least, the last 30 years. The term is widely used to consider the site effect taking into account the local soil characteristics instead of the simplified approach in a fixed-base analysis. A methodology based on the use of finite element modeling for evaluation of soil-structure interaction under horizontal seismic action is presented and results obtained are compared to methodology included in Veletsos and Damodaran Nair (J Struct Div ASCE 101:109-129, 1975) of characterizing the soil as the standard Voigt solid, which assumes the characteristics of a simulated 1 degree of freedom (DOF) oscillator. Besides, comparison with current formulae extracted from codes EN 1998-1 and ASCE 7-05 will be performed.
机译：基础条件和类型对地上全密闭液化天然气（LNG）储罐设计的影响使得有必要评估其由于动力作用而产生的结构响应。典型的地上全封闭式LNG储罐由一个由钢筋和预应力混凝土制成的外罐组成，如果内罐和9％Ni钢内罐发生故障，该罐可提供支撑，保护和二次密闭。充当主要和主要遏制。适用的规范性EN 14620-1中包含全密闭LNG储罐的概念描述。地基是一种结构元件，在地震情况下可作为动力激励传输器并修改结构响应。由于动态能量交换，这种效应被称为土壤-结构相互作用，这会影响整体结构响应。至少在过去30年中，在LNG储罐上实施了地震荷载作用下的土壤-结构相互作用。该术语被广泛用于考虑场地的影响并考虑到当地的土壤特性，而不是在固定基础分析中的简化方法。提出了一种基于有限元模型的水平地震作用下土壤-结构相互作用评估方法，并将得到的结果与Veletsos和Damodaran Nair（J Struct Div ASCE 101：109-129，1975）中包括的方法进行了比较。将土壤表征为标准Voigt固体，该固体具有模拟的1自由度（DOF）振荡器的特征。此外，将与从代码EN 1998-1和ASCE 7-05中提取的当前公式进行比较。

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