Settlement of foundations is of crucial concern as it affects the strength and durability of the
superstructure as well as the foundation itself. Traditional settlement analysis methodologies cease to
incorporate uncertainties associated with design parameters of the foundation. Probability-based settlement
analysis of raft foundations accounting for the uncertainties in design variables is presented in this paper.
Probabilistic soil-structure interaction model of the raft is developed duly considering the variability involved in
various design parameters. The first order reliability method (FORM) is used to evaluate the probability of
failure and reliability index associated with the settlement of the raft foundations. Parametric sensitivity analysis
is also carried out to identify the important design variables that affect the performance of the raft foundation in
connection with the settlement limit state. The reliability analysis of the raft employing the finite element
method is also presented.
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