Residential Footings on Expansive Soils: Design Methods and Climate Soil Structure Interaction

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Abstract
Expansive soils continue to be one of the most difficult and costly ground conditions faced in residential construction. Their shrink-swell behaviour causes differential ground movement, leading to widespread serviceability issues. Numerous international design standards and methods have been developed to mitigate these effects; however, their predictive consistency and underlying assumptions remain insufficiently evaluated. This study presents a critical review of residential footing design frameworks, focusing on two key aspects: the prediction of potential ground movement and the determination of footing design requirements. The review synthesises international standards, widely adopted design methods, comparative case analyses, field observations, forensic investigations, and numerical modelling studies. Results show that, although general trends in soil reactivity are consistently identified, substantial discrepancies exist in predicted footing requirements. These differences arise primarily from how ground movement is translated into structural demand rather than from variations in estimated soil response. The review further examines the treatment of climate and moisture effects, demonstrating that vegetation, drainage, and construction-induced variability significantly influence performance but are inadequately represented in current frameworks. The study highlights the potential benefit of performance-based, climate-responsive design approaches that integrate improved soil characterisation with coupled numerical modelling to enhance reliability and consistency in residential footing design.
Funding Information
  • SmartCrete CRC (23.0163)
  • Swinburne University of Technology

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