抄録
A new elastic plastic analysis based on the hybrid type Hellinger-Reissner's principle is extended to geometrically nonlinear analysis. This analysis is applied to dynamic response analysis of multi-storied frames. And the conclusions are obtained as follows. 1) This analysis is efficient enough to study the behavior of multi-storied frames. 2) Dynamic response of strain at the end of the beam is quite dependent upon mechanical properties of materials. 3) The influence of existence of vertical load on the beam is quite small to the response of inter-story displacement and nodal rotation, but it is quite large to the response of strain at the end of the beam. And if vertical load parameter κ on the beam is greater than 0.35, this local strain may accumulate. 4) Vertical motion of earthquake sometimes promotes accumulation of this local strain of the beam.
