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A numerical model for the description of the nonlinear behaviour of multi-leaf masonrv walls

机译：用于描述多叶砌筑墙非线性行为的数值模型

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A nonlinear finite element model was developed to simulate the nonlinear response of three-leaf masonry specimens, which were subjected to laboratory tests with the aim of investigating the mechanical behaviour of multiple-leaf stone masonry walls up to failure. The specimens consisted of two external leaves made of stone bricks and mortar joints, and an internal leaf in mortar and stone aggregate. Different loading conditions, typologies of the collar joints, and stone types were taken into account. The constitutive law implemented in the model is characterized by a damage tensor, which allows the damage-induced anisotropy accompanying the cracking process to be described. To follow the post-peak behaviour of the specimens with sufficient accuracy it was necessary to make the damage model nonlocal, to avoid mesh-dependency effects related to the strain-softening behaviour of the material. Comparisons between the predicted and measured failure loads are quite satisfactory in most of the studied cases.
机译：建立了非线性有限元模型来模拟三叶砌体标本的非线性响应，并对其进行了实验室测试，目的是调查多叶石砌体墙直至破坏的力学行为。标本由两块用石砖和砂浆缝制成的外部叶片，以及一块用砂浆和石料制成的内部叶片组成。考虑了不同的加载条件，领口接头的类型以及石材的类型。模型中执行的本构定律的特征在于损伤张量，该张量允许描述伴随裂纹过程的损伤引起的各向异性。为了以足够的精度跟踪样品的峰后行为，有必要使损伤模型成为非局部的，以避免与材料的应变软化行为相关的网格依赖效应。在大多数研究案例中，预测和测量的失效载荷之间的比较是非常令人满意的。

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