This paper describes the digital control of a vibratory pile driver in which the vibration is generated via two tandem pairs of electrically driven, geared, contra-rotating eccentrics. Experimental results are included to show the controller-induced system dynamics for a variety of load conditions, and to highlight the fact that, if the relative phase of the eccentric pairs is not controlled, t...

The problem of soil±pile±foundation±superstructure interaction is examined, and a simple rational procedure to analyse the response of a structure supported on pile groups is presented. This procedure combines theories for the computation of the dynamic impedances and kinematic±seismic response factors of pile foundations with a multi-degree-of-freedom structural model. The procedure is applied...

Impact pile driving is a multi-component problem which is associated to multi-directional ground vibrations. At first, vibration is transferred from the hammer to the pile and then to the common interface of pile and soil. This is then transferred to the environment and has great impact on the adjacent structures, causing disturbance to residents and also damage to the buildings. It is of high ...

Society's transition to low-carbon energy sources has resulted in significant expansion offshore wind technology. Most turbines (OWTs) are founded on large-diameter steel tubular piles driven into the seabed, termed monopiles. OWTs subjected large numbers of dynamic and cyclic environmental loads during their lifetime. To avoid fatigue or resonance issues, accurate characterisation soil-structu...

In general Pile foundations are often subject to more than one load in nature. Two loadings, when simultaneous, cause serious problems the bearing capacity. Therefore, major objective of this study is assessment performance piles under inclined cyclic loads simultaneous with static lateral sandy soil a relative density 70%. A laboratory investigates were conducted determine effect several facto...

to increase the safety of structures against strong ground motions and their life due to environmental issues on the earth and saving in terms of materials, it is necessary to expand and upgrade seismic resistant systems. however, more cost-effective systems which have sufficient influence on the seismic performance of structures and also more compatibility with the regional conditions, will be...

The load-transfer factor () in the concentric cylinder approach is often used analytical formulation axially loaded piles. a constant value (in given pile slenderness ratio and soil condition) devised under elastic ‘pre-failure’ perfect pile–soil bonding conditions (a non-slip model). Given most numerical methods have already considered slipping stage, limitations of models recently been discus...

A hybrid modeling approach that uses the parabolic equation (PE) with an empirical source model is presented to study and predict the underwater noise due to pile driving in shallow, inhomogeneous environments over long propagation ranges. The empirical source model uses a phased point source array to simulate the time-dependent pile source. The pile source is coupled with a broadband applicati...