Abstract

The experimental study aims to increase the axial load capacities of reinforced concrete (RC) columns with square cross-section by carbon fiber textile composite (CFRP) strips. The main purpose of the study is to develop a strengthening method that does not adversely affect displacement ductility ratios and energy dissipation capacities. Improved strengthening details have been applied to a square cross-section RC column with low axial load capacity, the low compressive strength of concrete, and the inadequate number of stirrups, which are not designed according to regulations. The main variables examined in this study are the CFRP strip width, the spacing of CFRP strips, the use of anchorage in the overlap zone at CFRP strips, and the placement of CFRP strips horizontally or vertically to the column axis. In line with this study, eleven reinforced concrete columns with dimensions of 150x150x500 mm were produced. The ultimate axial load capacity, initial stiffness, displacement ductility ratios, and energy dissipation capacities of the test specimens were evaluated. It was investigated how the variables in the experiments affected the behavior of the columns. The performances of the details developed for strengthening have been examined and interpreted.

摘要

实验研究旨在通过碳纤维织物复合材料（CFRP）条来增加具有方形截面的钢筋混凝土（RC）柱的轴向承载能力。该研究的主要目的是开发一种不会对位移延性比和能量耗散能力产生不利影响的加固方法。改进的加固细节已应用于具有低轴向载荷能力，混凝土抗压强度低以及箍筋数量不足的方形截面RC柱，这些未按规定进行设计。在这项研究中检查的主要变量是：CFRP板的宽度，CFRP板的间距，在CFRP板的重叠区使用锚固以及CFRP板水平或垂直于柱轴的位置。根据这项研究，制作了11根尺寸为150x150x500 mm的钢筋混凝土柱。评估了试样的极限轴向载荷能力，初始刚度，位移延性比和能量耗散能力。研究了实验中的变量如何影响色谱柱的性能。为加强而开发的细节的性能已得到检查和解释。