Analysis On Shearing Performance Of SRC Transformation Columns

Cross-type profile Steel-Reinforced Concrete columns have been widely used in the below storeys of the high-rise or super high-rise building structures, but the box-type profile steel columns are used in the upper storeys. So the transformation columns which transform form cross-type to box-type are need. The anchoring length of corss-type profile column's web specified by《Techinical specification for steel reinforced concrete structures》and《Techinical specification for steel structure of tall buildings》is too long .So it is very difficult to weld the transformation column. At present, there is rare research data related to the transformation column.Simulate the shear bearing capacity of transformation column under various shear-span ratio, axial compression ratio,stirrup reinforcement ratio,steel's web thickness and concrete strength grade by using ANSYS. The influence on maximum shear force of transformation column caused by the different anchoring length of corss-type profile column's web is analyzed. the design formula of the shear bearing capacity and suggested anchoring length of corss-type profile column's web are presented.Study the seismic performance of transformation column under horizontal cyclic loading, analyse hysteretic loops, skeleton curves and ductility of transformation column under various shear span ratio, axial compression ratio, stirrup reinforcement ratio, and concrete strength grade. The influence on seismic behavior and ductility of transformation column caused by the different anchoring length of cross-type profile column's web is studied.With the comparison between models with and without bond-slip, the influences on shear bearing capacity of transformation column are analyzed.