ABSTRACT
A procedure is presented for estimating the global and local seismic deformation demands for steel frame structures. In this procedure the ground motion spectral displacement at the first mode period of the structure is related to the roof drift demand for the multi-degree-of-freedom (MDOF) structure, which in turn is related to the story drift demands. The relationships are based on statistical values obtained from time history analyses of nine steel moment frame structures subjected to sets of ground motions representative of different hazard levels. The story drift demand is related to the beam and panel zone plastic deformation demands using strength and stiffness properties of the components. The procedure should prove useful for estimating strength and stiffness requirements in conceptual design and estimating deformation demands for performance assessment.
