It is the objective of this study to investigate the axial behavior of circular reinforced concrete (RC) columns strengthened with ultra-high performance fiber-reinforced concrete (UHPFRC) jackets. For this purpose, 14 circular base column specimens, each 120 mm in diameter and 500 mm in height, were cast whose contact surfaces were prepared through longitudinal or horizontal grooving, sandblasting, and abrasion techniques. Moreover, 10 specimens were strengthened with UHPFRC jackets 15 mm in thickness and containing either steel fibers or synthetic (barchip) macro-fibers, while three more were strengthened with full or intermittent glass fiber-reinforced polymer (GFRP) hoop wraps. The specimens subjected to the novel longitudinal grooving surface treatment were found to exhibit a monolithic compression behavior with average increases of 33% and 34% recorded in their load-carrying capacity and energy absorption, respectively, compared to those achieved by the specimens subjected to the common sand blasting technique. Using the data thus obtained, a model was finally proposed for predicting the stress-strain relation of RC columns strengthened with UHPFRC jackets. Verification of the model against the results reported elsewhere shows its great prediction accuracy.

这项研究的目的是研究用超高性能纤维增强混凝土（UHPFRC）护套增强的圆形钢筋混凝土（RC）柱的轴向性能。为此，铸造了14个直径为120毫米，高度为500毫米的圆形基础柱试样，它们的接触面是通过纵向或水平开槽，喷砂和磨蚀技术制备的。此外，用厚度为15 mm的UHPFRC护套增强了10个标本，其中包含钢纤维或合成（条码）大纤维，而另外三个则用完全或间断的玻璃纤维增​​强聚合物（GFRP）箍包裹增强。发现经过新型纵向开槽表面处理的试样与整体式试样相比，表现出整体压缩性能，其承载能力和能量吸收分别平均增加了33％和34％。常见的喷砂技术。利用由此获得的数据，最终提出了一个模型，以预测用UHPFRC夹套加固的RC柱的应力-应变关系。根据其他地方报告的结果对模型进行验证，表明了其出色的预测准确性。最后提出了一个模型，以预测用UHPFRC夹套加固的RC柱的应力-应变关系。根据其他地方报告的结果对模型进行验证，表明了其出色的预测准确性。最后提出了一个模型，以预测用UHPFRC夹套加固的RC柱的应力-应变关系。根据其他地方报告的结果对模型进行验证，表明了其出色的预测准确性。