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首页> 外文期刊>International Journal of Solids and Structures >Identification of the representative crack length evolution in a multi-level interface model for quasi-brittle masonry
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Identification of the representative crack length evolution in a multi-level interface model for quasi-brittle masonry

机译：准脆性砖石多层次界面模型中代表性裂纹长度演化的识别

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摘要

It is proposed here to identify the law of crack length evolution with a small number of parameters governing a recently presented model (Rekik and Lebon, submitted for publication) describing the interface behavior in damaged masonry. Studies on non-confined medium- and large-sized masonry structures have shown that it is necessary to obtain a linear increasing crack in the post-peak part of the "stress-strain or -displacement" diagram. In confined masonry structures showing softening and sliding parts, the results obtained with this crack evolution failed to match the experimental data. The crack lengths identified in the post-peak part at several points on the experimental "stress-displacement" diagram show that the representative crack length is a bilinear or trilinear function describing the increase in the crack length with respect to the decrease in the shear stress. Numerical studies on medium- and large-sized masonry structures consisting of the same materials subjected to various loads were performed to determine the ultimate crack length, and the results are relatively insensitive to the size of the masonry and the type of the load applied. The numerical local fields determined in the elementary and full-scale structures investigated were used to test the validity of the present model at the local scale, as well as to obtain an additional unilateral condition in the case of compressed masonry structures in order to prevent overlapping between the masonry components.
机译：这里提出用少量的参数来确定裂缝长度的发展规律，这些参数控制着最近提出的描述损坏砌体中界面行为的模型（Rekik和Lebon，已提交出版）。对无限制的中型和大型砖石结构的研究表明，有必要在“应力-应变或位移”图的峰后部分获得线性增加的裂缝。在显示软化和滑动部分的受限砖石结构中，通过这种裂纹演化获得的结果与实验数据不符。实验后的“应力-位移”图上在峰后部分的几个点处确定的裂纹长度表明，代表性裂纹长度是双线性或三线性函数，描述了裂纹长度相对于剪应力的减小而增加的过程。对由相同材料组成的中型和大型砖石结构进行了各种数值研究，以确定其最终的裂缝长度，其结果对砖石的大小和所施加的载荷类型相对不敏感。在所研究的基本结构和全尺寸结构中确定的数字局部场用于在局部尺度上测试本模型的有效性，并在砌体结构受压的情况下获得附加的单边条件，以防止重叠在砖石构件之间。

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