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首页> 外文期刊>Journal of Earthquake Engineering >A MICROMECHANICAL INELASTIC MODEL FOR HISTORICAL MASONRY
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A MICROMECHANICAL INELASTIC MODEL FOR HISTORICAL MASONRY

机译：历史砌体的微机械非弹性模型

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A micromechanical damage model for the finite element modelling of historical masonry structures is presented in this article. Masonry is considered as a composite medium made up of a periodic assembly of blocks connected by orthogonal bed and head mortar joints. The constitutive equations, in plane stress, are based on the homogenisation theory and they consider the non linear stress-strain relationship in terms of mean stress and mean strain. Different in-plane damage mechanisms, involving both mortar and blocks, are considered and the damage process is governed by evolution laws based on an energetic approach derived from Fracture Mechanics and on a non-associated Coulomb friction law. The failure domain of the model is analysed both in the equivalent stress and in the principal stress space considering different orientations of the bed joints relative to the loading direction. A comparison with experimental results is provided. A numerical simulation of masonry walls subjected to horizontal forces proportional to their own weight is shown in order to discuss the model's capability of describing the influence of the masonry microstructure on its mechanical behaviour.
机译：本文提出了一种用于历史砌体结构有限元建模的微机械损伤模型。砌体被认为是一种复合介质，由通过正交床身和顶部砂浆缝连接的块体的周期性组装组成。平面应力中的本构方程基于均质化理论，并根据平均应力和平均应变来考虑非线性应力-应变关系。考虑了包括灰浆和块体在内的不同的平面损伤机理，并且损伤过程由基于断裂力学衍生的能量方法和非关联库仑摩擦定律的演化定律控制。考虑床缝相对于荷载方向的不同方向，在等效应力和主应力空间中都分析了模型的失效域。提供与实验结果的比较。为了讨论该模型描述砌体微观结构对其机械性能的影响的能力，给出了对砌体墙承受与自身重量成比例的水平力的数值模拟。

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