Abstract
Eigenvalue and dynamic analyses of medium- and low-rise R/C frames in which shear walls with edge members are arranged in various patterns are conducted within the elastic range. And the effects of vertical component of earthquake ground motions and vertical column modes on the seismic behavior of fifty-six different model frames are investigated. Summarizing the results of analysis; (1) Pattern of arrangement of the shear walls into ductile moment-resisting plane frames has not a remarkable effect on the fundamental periods of vibration in vertical column modes, although the fundamental periods of lateral-sway modes are considerably affected by the difference of the shear wall arrangement in the building frames. (2) Vertical mode shapes of the building frames having various arrangement of shear walls can be classified into three groups. Effects of vertical component of ground motions on dynamic forces induced in the first story exterior and interior columns are dependent on the difference of those classified mode shapes. (3) Vertical component of ground motions gives a larger effect on axial forces in the upper story individual columns rather than the lower columns. (4) Axial forces in many of the interior columns located in the first story are considerably affected by the vertical component of simultaneous ground motions, while the vertical component of simultaneous ground motions has not a large effect on the axial forces in first story exterior columns. (5) Vertical component of simultaneous ground motions has not a large effect on the story shears and drifts.
