実地盤中に根入れされた模型ケーソン基礎の振動実験

Abstract

This paper presents the results of experiments on reinforced concrete model caissons withcircular and square sections, embedded in a clay layer under surface fill. They were excited bya mechanical vibrator whose exciting force can be controlled during operation. Along with dis-cusison of various experimental results obtained, the vibrational characteristies of the model caissonsare dealt with in comparison with a simple linear oscillator, in which it is pointed out that the springcoefficient and the damping constant due to soil layer are regarded as functions of the excitationfrequency, as a result of the soil-substructure interaction. And their frequency characteristics arecalculated from the frequency response curve and the phase curve gained in the above mentionedexperiments.