Nonlinear analysis of RC frame structure including shear effects

In reinforced concrete tall building structures and bridge,the sections of the frame columns are larger and their shear-span ratios are smaller due to the limitation of the axial-compression ratio of the columns.Some short and even ultra short columns at the bottom floors of the structures are prone to brittle shear failure,which may result in damage and even collapse of the structures because of their poor ductility during earthquakes.On the base of beam-column element considering plastic shearing deformation,this paper presented simulating model of unitary nonlinear analysis of RC frame structure including short column.The program was presented.Shear deformations are thus uncoupled from axial and bending effects in the section stiffness,but shear and bending forces become coupled at the element level because equilibrium is enforced along the beam element.The results of simulation show that the model could describe the nonlinear performance of RC frame structure driven by load including axial compress,bending,and shear effects.