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A Discrete Element for Modeling Masonry Vaults

机译：砌体库建模的离散元素

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The assessment of the seismic response of historical masonry buildings represents a subject of considerable importance but, at the same time, of very difficult task. Refined finite element numerical models, able to predict the non-linear dynamic mechanical behavior and the degradation of the masonry media, require sophisticated constitutive law and a huge computational cost that makes these methods nowadays not suitable for practical application. In the past many authors developed simplified or alternative methodologies that, with a reduced computational effort, should be able to provide numerical results that can be considered sufficiently accurate for engineering practice purposes. However most of these methods are based on simplified hypotheses that make these approaches inappropriate for monumental buildings. In this paper a three dimensional discrete element model, able to predict the nonlinear behaviour of masonry shell elements, is presented as an extension of a previously introduced spatial discrete-element conceived for the simulation of both the in-plane and the out-of-plane behavior of masonry plane elements. The new macro-element enriches a larger computational framework, based on macro-element approach, devoted to the numerical simulation of the seismic behaviour of historical masonry structures.
机译：对历史性砖石建筑的地震反应的评估是一个相当重要的主题，但与此同时，也是一项非常艰巨的任务。能够预测非线性动力力学行为和砌体介质退化的精细有限元数值模型，需要复杂的本构定律和巨大的计算成本，这使得这些方法如今不适合实际应用。过去，许多作者开发了简化的或替代的方法，这些方法可以减少计算量，从而能够提供对于工程实践目的而言足够准确的数值结果。但是，这些方法大多数都是基于简化的假设，这些假设使这些方法不适用于纪念性建筑。在本文中，提出了三维离散元模型，该模型能够预测砌体壳体元素的非线性行为，是对先前引入的空间离散元的扩展，该空间离散元是为平面内和平面外仿真而设计的砌体平面元素的平面行为。基于宏观元素方法，新的宏观元素丰富了更大的计算框架，专门用于对历史砌体结构的地震行为进行数值模拟。

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