Reliability-based Design Applied to Multi-column Composite Foundations

This paper presents an approach based on Reliability-Based Design (RBD) to evaluate area replacement ratios (percent coverage) of columns in a multi- column composite foundation. A geostatistical technique is implemented to estimate the autocorrelation distance of foundation soil along the vertical direction. Instead of using differential and simulation processes to estimated reliability indices from the nonlinear and complex limit state equations, the Immune Algorithm method is introduced as a new and effective technique to provide a more accurate solution to optimization problems. Reliability analyses of both bearing capacity and settlement of multi-column composite foundations are performed to obtain relationships between reliability indices and area replacement ratios of columns. Based on previous studies, a target reliability index of 3.0 is selected as a criterion to estimate area replacement ratios of composite foundations.

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