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Stress State Analysis and Failure Mechanisms of Masonry Columns Reinforced with FRP under Concentric Compressive Load

机译：同心压缩载荷下FRP加固砌体柱的应力状态分析和失效机制

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The strengthening and stabilization of damaged compressed masonry columns with composites based on fabrics of high-strength fibers and epoxy resin, or polymer-modified cement mixtures, belongs to novel, partially non-invasive and reversible progressive methods. The stabilizing and reinforcing effect of these fabrics significantly applies to masonry structures under concentric compressive loading whose failure mechanism is characterized by the appearance and development of vertical tensile cracks accompanied by an increase in horizontal masonry strain. During the appearance of micro and hairline cracks (10 ?3 to 10 ?1 mm), the effect of non-pre-stressed wrapping composite is very small. The favorable effect of passive wrapping is only intensively manifested after the appearance of cracks (10 ?1 mm and bigger) at higher loading levels. In the case of “optimum” reinforcement of a masonry column, the experimental research showed an increase in vertical displacements δ y (up to 247%), horizontal displacements δ x (up to 742%) and ultimate load-bearing capacity (up to 136%) compared to the values reached in unreinforced masonry columns. In the case of masonry structures in which no intensive “bed joint filler–masonry unit” interaction occurs, e.g., in regular coursed masonry with little differences in the mechanical characteristics of masonry units and the binder, the reinforcing effect of the fabric applies only partially.
机译：基于高强度纤维和环氧树脂的织物的复合材料或聚合物改性水泥混合物的复合材料的强化和稳定属于新颖，部分无侵入性和可逆的渐进方法。这些织物的稳定和增强效果显着适用于同心压缩负载下的砌体结构，其故障机理的特征在于垂直拉伸裂纹的外观和发展，伴随着水平砌体菌株的增加。在微观和发际裂缝的外观（10？3至10≤1mm），非预应力包装复合材料的效果非常小。被动包装的有利效果仅在较高负载水平的裂缝（10？1mm和更大）的外观之后强烈表现出来。在“最佳”增强砌体柱的情况下，实验研究表明垂直位移ΔY（高达247％）的增加，水平位移δδ（高达742％）和最终承载能力（最多136％）与在未原始的砌体柱中达到的值相比。在透射率“床关节填充砌体单元”相互作用的情况下，例如，在普通植物砌体中具有少于砌体单元和粘合剂的机械特性的差异很小，织物的增强效果仅部分地适用。

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