抄録
One important problem concerned with an aseismic design of frame is to avoid damage concentration into a weak story in the frame during earthquake ground motions. The effect of shear strength of beam-to-column connections on the elasto-plastic response behavior, especially on the damage concentration, of low-rise steel frame is investigated herein. Some results are : (1) Plastic strain energy distribution absorbed, or damage distribution, in frame with shear stiffening connections based on the current design formula strongly depends on the distribution of story-shear strength of the frame. (2) Story-story coupling effects due to the shear plastification of beam-to-column connections in weak-panel frame, which have panel-column yielding ratio smaller than about 0.4, produce good distribution of maximum story displacement in the frame. (3) Independently of story-shear strength distribution in frame, damage concentration into weak stories in weak-panel frame, such as with no-shear stiffening connections, can be effectively avoided by story-story coupling effects.
