抄録
The D_s-value means a reduction factor of the design seismic force for structures with inelastic deformability. D_s-values for shear type multi-story structures such as a weak-column type of buildings have been derived by considering the equilibrium between the input energy due to an earthquake and the absorbed energy by a building. Another typical type of structures is of weak-beam type which is expected to be equipped with large energy absorption capacity, but D_s-values for those stuctures have been left uncertain. In this paper, firstly a general law which governs the vertical distribution of the cumulated inelastic deformation (damage) is obtained and is expressed in terms of the stiffness ratio of beam to column. Next, based on the basic law, D_s-values for weak-beam type of steel buildings are derived analytically and the results are compared with those for weak-beam type of steel buildings are derived analytically and the results are compared with those for weak-column type of buildings.
