This study presents the structural potentials of an entire restoration technique proposed for upgrading the strength and ductility of severely damaged non-seismic columns. Three columns were prepared under concentric axial loads to examine the axial load–axial strain relationship of restored columns. Additionally, five columns subjected to a constant axial load and cyclic lateral loads were prepared to ascertain the seismic behavior of the restored columns. To simulate the entire restoration of damaged columns, non-seismic columns were initially tested up to their peak axial capacity or 80% of the flexural strength on the post-peak performance; the longitudinal and transverse reinforcing bars and concrete were then reconstructed after total removal from the initially damaged columns. The test results showed that the axial load–axial strain and lateral load–lateral displacement relationships of the restored columns exhibited pre-peak behavior that was quite similar to that of the initial non-seismic columns, whereas the slope at the post-peak branches significantly slowed down for the former columns in comparison to the latter ones. Thus, the axial and flexural strengths of the restored columns could be conservatively assessed by the procedure recommended in the ACI 318-19 provision. The restored columns displayed axial ductility and flexural displacement ductility ratios comparable to those obtained in columns strengthened using the reinforced concrete (RC) jacket with seismic details that were developed using an approach similar to the proposed restoration technique. Thus, the proposed technique shows significant potential in enhancing the seismic performance of severely damaged non-seismic columns by providing confinement to concrete cores and preventing premature buckling of longitudinal reinforcements.

这项研究提出了一种整体修复技术的结构潜力，该技术旨在提高严重受损的非地震柱的强度和延性。在同心的轴向载荷下准备了三根圆柱，以检查恢复的圆柱的轴向载荷与轴向应变的关系。此外，准备了五根承受恒定轴向载荷和周期性横向载荷的柱，以确定地震行为。还原的列。为了模拟受损柱的整个恢复过程，最初对非地震柱进行了测试，直至其峰值轴向承载力或峰后性能的抗弯强度的80％为止。从最初损坏的柱子上全部拆除后，再重建纵向和横向钢筋和混凝土。测试结果表明，恢复柱的轴向荷载-轴向应变和横向荷载-侧向位移关系表现出与初始非地震柱非常相似的峰前行为，而峰后分支处的斜率与后一列相比，前一列的速度明显下降。因此，可以通过ACI 318-19规定中推荐的程序保守地评估恢复柱的轴向和抗弯强度。修复后的柱子的轴向延展性和挠曲位移的延展性比值与使用钢筋加固的柱子相当。具有类似于地震细节的钢筋混凝土（RC）护套，其开发方法与拟议的修复技术类似。因此，所提出的技术通过限制混凝土芯并防止纵向钢筋过早屈曲，在增强严重受损的非地震柱的抗震性能方面显示出巨大的潜力。