Research on Shear Capacity and Deformation Capacity of T Shaped Column under Forward and Reverse Loading

Because of the special section of T shaped columns,the web will bear pressure and the flange will bear tension or the web will bear tension and the flange will bear pressure under forward and reverse load,it is different to the shear capacity and deformation capacity of+ shaped column under forward and reverse load.This paper analyzed the shear experiments of T shaped columns in China,investigated the experimental characteristics of shear capacity and deformation capacity about T shaped columns under forward and reverse load.Through low frequency cyclic loading experiment of T shaped column,investigated the failure characteristic,the shear capacity and deformation capacity characteristic of T shaped column with low shear-span ratio.It is shown that when the narrow sense shear-span ratio is less than 3.0,the shear capacity and deformation capacity of the T shaped column are different obviously under forward and reverse load because of the irregular section,that is to say the seismic behavior of two directions is different.The web concrete in column foot will damage seriously while the wed bearing pressure,which lower the section stiffness and shear capacity,so the column foot maybe become the weakness position of structure with specially shaped columns.