ฉันรักการแปลEarthquake Ground Motion
No external dynamic forces are applied to the idealized two story structure shown in Fig. 25. The excitation in this case is the earthquake induced motion at the base of the structure, presumed to be only a horizontal component of ground motion with dis• placement Ug(t), velocity uR(t), and acceleration iig(t). Under the influence of such an excitation, the base of the structure displaces by an amount uR(t) if the ground is rigid, and the structure undergoes deformation resulting in floor displacements u.It) and ui(t), relative to the ground. The total displacements of
the floors are: