Abstract
When a steel space frame with eccentricity is subjected to horizontal force due to earthquake, torsional vibration is developed and plastic deformation is concentrated in the outer plane frame. Many studies to investigate the effect of eccentricity on earthquake response of space frames has been carried out. In this paper, the effect of the structural parameters and input earthquake direction on plastic deformation capacity demand of strong column type steel space frame members is solved theoretically. The analytical model is one story - one bay rectangular plane type frame, whose each plane frame's strength and rigidity are proportional. The relation between load and deformation of space frame against any input earthquake direction can lead the formula to estimate plastic deformation capacity demand of members. The results of earthquake response analysis agree well with the theoretical prediction.
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