单侧加固钢筋混凝土柱受力性能的数值模拟

Study on the mechanical behavior of one-side strengthened reinforced concrete columns using finite element analysis

为了研究单侧加固钢筋混凝土柱的受力性能,明确加固效果,通过ABAQUS有限元软件对不同加载方向、不同加固截面尺寸、不同预应力度的单侧加固钢筋混凝土柱进行单调水平荷载作用下的数值模拟,并与未加固钢筋混凝土柱对比。结果表明单侧加固钢筋混凝土柱两个主轴方向的承载力都有不同程度的提高,变形能力变化不明显;两主轴方向的承载力都随加固部分截面尺寸的增大而提高,变形能力变化亦不明显;在新增加固柱上施加预应力后承载力提高更加显著,施加的预应力度对两主轴方向的承载力有不同程度的影响,变形能力随预应力度的增加而逐渐减小。

This paper presents a strengthening method for reinforced concrete(RC) columns, in which an additional RC column is attached to the original RC column. This method is similar to the reinforcement method by enlarging the column section on one side. To investigate the mechanical behavior and enhancement performance of the strengthened columns under monotonous horizontal loads, finite element analysis was conducted through the commercial software ABAQUS. In the analysis, loading directions, section size of strengthened part, and pre-stressing ratios were selected as parameters to reveal the mechanical behavior of the strengthened columns. Unreinforced column was also simulated for comparison. The analytical results show that the bearing capacity in two principal directions of the strengthened columns increases in different degrees, the deformation ability is affected slightly. And the lager the section size of strengthened part is, the more increase of bearing capacity in two principal directions will be achieved,the deformation ability is also affected slightly. When applying pre-stress to the strengthened part, the increase of bearing capacity is more significant, but the pre-stress ratios have different impacts on the bearing capacity in two principle directions, the deformation ability decreases when increasing the pre-stressing ratio.