THE RESEARCH ON THE INFLUENCE OF FLOOR STIFFNESS FOR THE STABILITY OF STEEL COLUMNS
The local model of a steel frame residential structure is taken to investigate the influence of floor surface stiffness on the stability bearing capacity of steel columns,in which the finite element software ANSYS is used to simulate the steel beam,steel column,bolts,and floors. The equivalent constraint stiffness of the floor to the column top is extracted,and the equivalent width of the corresponding constraint effect of the floor is determined. The elas-tic-plastic ultimate bearing capacity of the steel column is obtained by arc length method considering the influence of the whole structure defect,the local defect of the member,the material,and the geometric nonlinearity. The effec-tiveness of the flexural stiffness of the floor on the ultimate bearing capacity of the steel column is investigated,and the variation of the equivalent stiffness of the floor and the stability coefficient of the steel column with the thickness of the floor is analyzed. The results show that the lateral stiffness of the floor has a significant effect on the rotation constraint of the steel column,and the constraint effect gradually increases with the increase of the floor thickness,providing the reference for the design of steel frame residential steel column.
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