2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference

Soil-Structure Interaction in Offshore Caissons Subject to Lateral Loads

Dr. Asif Iqbal, University of Northern British Columbia (Presenter)

This paper describes development and application of a numerical model to investigate interaction between large-diameter submerged caissons with the soil around. The structure is essentially treated as flexible piles. The model uses a matrix formulation of the beam-on-elastic foundation theory as applicable to the problem. A historical analytical procedure for estimating load-reflection curve considering the mobilized angle of friction is examined for comparison. Both the old and the proposed model are applied in design of a group of tower foundations at river-crossing part a power transmission grid. Each tower supported by a single caisson of great founding depth, subjected to scour, hydraulic drag, wind and earthquake forces as well as vertical load from the tower. Results from the two analyses are found to be in reasonable agreement for most of the parameters, including the distribution of bending moments along the lengths of the caissons and deflections at the top.