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In this paper; nonlinear analysis of steel frames subjected to seismic forces is presented. The analysis adopts the beamcolumn approach. The formulation of beamcolumn element is is based on Eulerian approach. Changes in member chord length due to axial strain and flexural bowing are taken into account. A modified tangent stiffness matrix which takes into consideration the geometrical nonlinearity is used. A special form to formulate the seismic forces and the monotonic loaddeflection response of frames is traced using the incremental load control NewtonRaphson iterative technique. It was concluded that considering large displacements tend to reduce the collapse loads of steel frame in the order of (440%) depending upon the number of stories of the frame.
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