中文摘要：

由于T形和L形柱特殊的截面形式,正反受剪时存在腹板和翼缘分别受压和受拉2种状态,其正反向受剪承载力和变形能力往往存在差异,且剪跨比越小这种差异越显著。对剪跨比λ=2.5时的T形和L形柱进行低周反复荷载试验,分析了低剪跨比状态下T形和L形柱正反向加载破坏特征、承载能力、变形能力和延性、刚度退化等抗震性能指标。研究表明,T形和L形柱正反2个方向受剪承载能力和变形能力存在显著差异,腹板受压时,柱脚腹板混凝土破坏严重,降低了异形柱的截面刚度和承载力,成为异形柱结构的薄弱部位。

英文摘要：

Due to the special section of T and L-shaped columns,the web and the flange will bear pressure or tension under forward and reverse load.The shear capacity and deformation capacity are different under forward and reverse load,and when the shear-span is lower the difference is more obvious.Through low frequency cyclic loading experiment of T and L-shaped columns while the shear-span is 2.5,this paper investigated the failure characteristic,shear capacity,deformation capacity and rigidity degeneracy of the T and L-shaped columns with low shear-span ratio.The results show that the shear capacity and deformation capacity of the T and L-shaped columns are obviously different under forward and reverse load.The web concrete in column foot will be damaged seriously under pressure,which reduces the section stiffness and shear capacity,so the column foot may become the weak position of specially shaped columns.