Abstract
Using realistic restoring force characteristics of steel rigid frames, response analyses were made up to their collapse states. Analytical results were well consistent with Housner's energy concept. The proposed procedure of aseismic limit design of steel rigid frames is summarized as followings. 1) Calculate plastic deformation response of the elastic-perfectly plastic vibrational system with same natural period and same yield base shear coefficient as those of the structure dealt with (Prepared diagram such as that shown in Fig. 11 may be available). 2) Referring the restoring force characteristics pertinent to the structure, deformation response of the structure, μ^^- can be converted by eq. (4) from the value obtained in 1), μ^^-_<ep>. 3) Safety of the structure against collapse can be assured by the next criterion. μ^^-_<m.c>>μ^^- where μ^^-_<m.c> : ultimate deformability of the structure.
