Refined Rigid Block Model for In-Plane Loaded Masonry
Refined Rigid Block Model for In-Plane Loaded Masonry
复制标题
平面内加载砌体的精细刚性块模型
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
F. Ubertini
中科院分区：
文献类型：
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作者：
Daniele Baraldi;C. B. de Carvalho Bello;A. Cecchi;F. Ubertini
本文提出了一种改进的刚性块体模型，用于研究规则砌体的面内特性。刚性块体模型是在已有的具有刚性块体和弹塑性界面的离散/刚性模型的基础上建立的，该模型已经证明了其在线性和非线性领域中表征砌体行为的有效性。在这种情况下，通过假设由一维非线性界面连接的刚性四边形单元来改进所提出的模型，这些单元既用于表示砌块之间的砂浆（或干）接缝，也用于表示砌块内部潜在的裂缝。此外，还考虑了界面在拉伸和剪切作用下的软化行为。以规则纹理砌体板为研究对象，进行了压缩和剪切作用下的数值试验。特别注意的是崩溃机制和推覆曲线的数值计算，并与现有的数值和实验室结果进行比较。此外，数值试验旨在评估所提出的模型相对于现有结果的适用范围。
In this work, a refined rigid block model is proposed for studying the in-plane behavior of regular masonry. The rigid block model is based on an existing discrete/rigid model with rigid blocks and elastoplastic interfaces that already proven its effectiveness in representing masonry behavior in linear and nonlinear fields. In this case, the proposed model is improved by assuming rigid quadrilateral elements connected by one-dimensional nonlinear interfaces, which are adopted both to represent mortar (or dry) joints between the blocks and also to represent inner potential cracks into the blocks. Furthermore, the softening behavior of interfaces in tension and shear is taken into account. Several numerical tests are performed by considering masonry panels with regular texture subjected to compression and shear. Particular attention is given to the collapse mechanisms and the pushover curves obtained numerically and compared with existing numerical and laboratory results. Furthermore, the numerical tests aim to evaluate the applicability limits of the proposed model with respect to existing results.