Experimental research on steel specially shaped columns with T-section under cyclic loading

Pseudo-static tests on 8 steel columns with T-section models of 1:2 geometrical scale and equal stress under cyclic loading were reported. The deformation properties, failure mode were discussed, and the hysteretic loops, skeleton curves, bearing capacity, ductility and energy-dissipation were investigated. As a result, the effect of flange width-thickness ratio, web depth-thickness ratio and axial compression ratio were reviewed. Testing results indicate that the steel specially shaped column with T-section has excellent bearing capacity, good ductility and energy dissipation if certain flange width-thickness ratio, web depth-thickness ratio and axial compression ratio conditions are appropriate. Finite-element analysis were conducted based on initial geometric imperfection and geometric nonlinearity, and the results were close to those from the tests. The typical failure mode was local buckling instability with sufficient plastic deformation. Study evidence shows that steel specially shaped columns with T-section can be used in buildings in seismic regions. This study can provide background for practical engineering applications and design specification for steel structures with specially shaped columns.