ABSTRACT
Early in 1947, ea r thquake mot ion was considered for the first t ime as a r a n d o m process by Housner (1947), bu t it was ten years later before m a n y invest igators in ea r thquake engineering started to apply theories of r a n d o m vibra t ion to the analysis of s t ructural responses. A m o n g them were Rosenblueth (Tajimi, I960), Thomson (Barstein, 1960), Barstein (1960), Bolotin (1960), Tajimi (1960) and H u and Z h o u (C1962).* In the next decade, m a n y m o r e were interested in this topic, and so much progress was made tha t r a n d o m vibra t ion analysis became a powerful me thod in ea r thquake engin eering.
