起振機試験による基礎構造の振動特性 ―(その4)根入れと地下水の影響について―

Abstract

As a series of the experimental studies on foundation-ground system, the vertical andhorizontal harmonic excitation tests by the rotating mass type oscillator are carried out forthe two identical reinforced concrete foundations, one of which is constructed on and theother embedded in the typical soft ground in Osaka area. In the neighborhood of theembedded foundation the ground water level is lowered, if necessary, below its bottomsurface by the well point. It is the main purpose of this report to clarify the effects ofembedment and ground water both on the amplitude and phase characteristics of founda-tion responses and on the stiffness and damping ~oefficients representing equivalently therestoring force of soil medium.