Abstract

Shear failure is the major factor involved in the failure of structures and may occur in short columns. In this article, six reinforced concrete short columns are prepared and experimentally and numerically investigated using finite element analysis under cyclic lateral displacement. Since the failure occurred in short columns under earthquake is in the form of shear and brittle failures, several new techniques are proposed to strengthen short columns under lateral loads. These techniques include externally bonded reinforcement with carbon fibre reinforced polymer sheets in the form of transverse, diagonal and hybrid strengthening techniques. The experimental and numerical results demonstrate that the mentioned strengthening techniques in short columns lead to the change in the failure mode from shear to flexural and the change in the cracking and failure patterns of columns. The mentioned strengthening methods lead to the increase in the ductility, load carrying capacity, and dissipated energy.

摘要

剪切破坏是结构破坏的主要因素，可能发生在短柱中。在本文中，准备了六个钢筋混凝土短柱，并使用有限元分析在循环横向位移下进行了实验和数值研究。由于短柱在地震作用下发生的破坏是剪切和脆性破坏的形式，因此提出了几种在横向荷载作用下加固短柱的新技术。这些技术包括采用横向、对角和混合加固技术形式的碳纤维增强聚合物片材的外部粘合加固。实验和数值结果表明，上述短柱加固技术导致破坏模式从剪切转变为弯曲，并改变了柱的开裂和破坏模式。上述强化方法导致延展性、承载能力和耗散能量的增加。