A DESIGN FRAMEWORK FOR SOIL-FOUNDATION-STRUCTURE INTERACTION

A rigorous performance-based design methodology should not just consider the performance of the superstructure but the supporting foundation system as well. Case studies throughout history (eg. Kobe 1995, Kocaeli 1999 and Christchurch earthquakes 2010-2011) have demonstrated that a poor performance at the foundation level can result in a full demolition of the structure and, in general terms, that the extent of damage to, and repairability of, the building system as a whole, is given by the combination of the damage to the soil, foundation and superstructure. The lack of consideration of the modifying factors of soil-foundation-structure interaction (SFSI) and an absence of intuitive performance levels for controlling foundation and soil behaviour under seismic loads has resulted in inadequate designs for buildings sited on soft soil. For engineers to be satisfied that their designs meet the given performance levels they must first, understand how the soil-foundation interaction affects the overall system performance and secondly have tools available to adequately account for it in their design/assessment. This paper presents performance-based design considerations based on a de-aggregation of super-structure and foundation performance. Several effects and mechanisms of non-linear SFSI are discussed and related to design parameters (super-structure drift and foundation rotation). Following this a performance-based design framework is presented which addresses the discussed effects and is supported with a design example of a six-storey building.

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