Dynamic Response of Embedded Block Foundation Under Vertical Vibration

Abstract

The dynamic response of footing depends on several influencing parameters such as the shape and size of the foundation, effect of embedment, static load and dynamic excitation intensity. Here, efforts have been made to experimentally investigate the dynamic response of embedded block foundation under vertical vibration. Field experiments and analytical investigations using elastic half-space theory are carried out to study the dynamic response of embedded block foundation of aspect ratio L/B = 1.5 under vertical vibration for three different embedment depths (D = 0, 0.25 and 0.5 m) under static load of 6.6 kN. The block vibration tests are carried out using a Lazan-type mechanical oscillator under four different eccentric moments (W.e = 0.2, 0.8, 1.4 and 2.0 Nm). The frequency amplitude response of the block foundation obtained from elastic half-space theory are compared with the response obtained from the experimental investigations and it is observed that the maximum resonant amplitude decreases and resonant frequency increases as the embedment depth increases.