Reliability-based design approach for differential settlement of footings on cohesionless soils
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Date
2010
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Abstract
A probabilistic method is presented to estimate the differential settlements of footings on cohesionless soils, considering the uncertainties in both the load capacity sides of the design equation. A random field approach is employed to characterize the inherent soil variability. This method is first compared to typical limit values from the literature to denote critical combinations of design parameters that can lead to exceedance of tolerable differential settlements. Then, reliability-based design equations are developed for the serviceability limit state (SLS) design of footings on cohesionless soils. The key parameters controlling the SLS are the allowable angular distortion, site variability, footing spacing. The results are given in a straightforward design format indicate that currently suggested deformation factors (resistance factors for SLS) equal to 1.0 are likely to be unconservative for most design situations. © 2009 ASCE.
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Keywords
Mooring , Reliability , Settlement of structures , Soil structure interactions , Soils , Uncertainty analysis , Angular distortions , Cohesionless soil , Design equation , Design parameters , Design situations , Differential settlements , Footings , Foundation settlement , Key parameters , Limit values , Load capacity , Probabilistic methods , Random fields , Reliability based design , Resistance factors , Serviceability limit state , Soil variabilities , bearing capacity , cohesionless soil , design , estimation method , footing , probability , reliability analysis , soil-structure interaction , Design