Several recent works studied the efficiency of inorganic matrix composites, namely Textile Reinforced Mortar (TRM) or Fabric Reinforced Cementitious Matrix, for enhancing the strength and shortening capacity of masonry columns subjected to axial load. Literature studies were addressed to study the great number of variables involved in the problem, such as the nature and the grade of mortar, the strength of the fabric, the number of reinforcing layers, the type, the arrangement and the strength of the masonry, and helped to draw the first technical guidelines for practitioners and designers. All the experimental works highlighted that the actual performance of TRM confinement in masonry members was limited by the premature failure of the external layer in correspondence of the corners of sharp-edged sections, due to the stress concentration, limiting the confinement pressure achievable from the external wrap. This paper presents the result of an experimental investigation which aims to study the effect of a corner strengthening detail on the compressive behaviour of calcarenite masonry columns wrapped with glass TRM. The study was performed by varying the number of textile layers and the grade of the mortar adopted for the composite. The results show that the introduction of a fabric strip in correspondence of the corners can limit the stress concentration at the edges, allowing to exploit the confinement pressure of the TRM and achieving greater strength increases.

中文翻译：

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转角超筋条对TRM约束砌体柱抗压性能的影响

最近的几项工作研究了无机基复合材料的效率，即纺织增强砂浆 (TRM) 或织物增强水泥基体，用于提高砖石柱承受轴向载荷的强度和缩短能力。文献研究旨在研究该问题所涉及的大量变量，例如砂浆的性质和等级、织物的强度、增强层的数量、砌体的类型、排列和强度，并帮助为从业者和设计师绘制了第一个技术指南。所有的实验工作都强调，由于应力集中，与锐边截面角相对应的外层过早破坏，限制了砌体构件中 TRM 约束的实际性能，限制从外部包裹可达到的约束压力。本文介绍了一项实验研究的结果，旨在研究角部加固细节对玻璃 TRM 包裹的方解石砌体柱的压缩行为的影响。该研究是通过改变织物层数和复合材料所采用的砂浆等级来进行的。结果表明，在拐角处引入织物条可以限制边缘处的应力集中，从而可以利用 TRM 的约束压力并实现更大的强度增加。本文介绍了一项实验研究的结果，旨在研究角部加固细节对玻璃 TRM 包裹的方解石砌体柱的压缩行为的影响。该研究是通过改变织物层数和复合材料所采用的砂浆等级来进行的。结果表明，在拐角处引入织物条可以限制边缘处的应力集中，从而可以利用 TRM 的约束压力并实现更大的强度增加。本文介绍了一项实验研究的结果，旨在研究角部加固细节对用玻璃 TRM 包裹的方解石砌体柱的压缩行为的影响。该研究是通过改变织物层数和复合材料所采用的砂浆等级来进行的。结果表明，在拐角处引入织物条可以限制边缘处的应力集中，从而可以利用 TRM 的约束压力并实现更大的强度增加。