Lampropoulos Andreas, Paschalis Spyridon, Tsioulou Ourania, Dritsos Stephanos
School of Architecture, Technology and Engineering, University of Brighton, Cockcroft Building, Lewes Road, Brighton BN2 4GJ, UK.
School of Computing and Engineering, University of West London, Lady Byron Building, St Mary's Road, London W5 5RF, UK.
Materials (Basel). 2024 Jul 9;17(14):3380. doi: 10.3390/ma17143380.
The strengthening of existing columns using additional reinforced concrete (RC) jackets is one of the most popular techniques for the enhancement of a column's stiffness, load-bearing capacity and ductility. Important parameters affecting the effectiveness of this method are the strength of the additional concrete, concrete shrinkage and the connection between the old and the new concrete. In this study, the application of Ultra-High-Performance Fiber-Reinforced Concrete (UHPFRC) jackets for the structural upgrade of RC columns has been examined. Extensive numerical studies have been conducted to evaluate the effect of parameters such as the thickness of the jacket, concrete shrinkage and the addition of steel bars, and comparisons have been made with conventional RC jackets. The results of this study indicate that the use of UHPFRC can considerably improve the strength and the stiffness of existing reinforced concrete columns. The combination of UHPFRC and steel bars in the jacket leads to the most effective strengthening technique as a significant enhancement in the stiffness and the ultimate load capacity has been achieved.
使用额外的钢筋混凝土（RC）套加固现有柱体是增强柱体刚度、承载能力和延性最常用的技术之一。影响该方法有效性的重要参数包括额外混凝土的强度、混凝土收缩以及新旧混凝土之间的连接。在本研究中，对采用超高性能纤维增强混凝土（UHPFRC）套对钢筋混凝土柱进行结构升级的应用进行了研究。已开展大量数值研究以评估诸如套的厚度、混凝土收缩和钢筋添加等参数的影响，并与传统钢筋混凝土套进行了比较。本研究结果表明，使用UHPFRC可显著提高现有钢筋混凝土柱的强度和刚度。套中UHPFRC与钢筋的组合产生了最有效的加固技术，因为已实现了刚度和极限承载能力的显著增强。
