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1. Slab Footing And Foundation

Slab Footing And Foundation

Raft foundations (waffle raft/stiffened raft with or without deep edge beam) are commonly used, in a number of places around the world, as the preferred foundation system for supporting structures. In Australia, waffle rafts are commonly constructed to support relatively light residential structures (houses).

AS 2870—1996 2 PREFACE This Standard was prepared by the Standards Australia Committee BD/25 on Residential Slabs and Footings to supersede AS 2870.1—1988 and AS 2870.2—1990.

Slabs are primarily designed to limit the differential movement of the structure considering the gravity loads that need to be safely transferred to ground and also the potential movements of underneath reactive soil. Reactive soil can swell/shrink with changes in moisture content, and this could happen due to several reasons, including: (1) seasonal/natural causes, such as rain, evaporation, and effect of adjacent trees; and (2) other causes, such as pipe leakage, poor or faulty drainage systems, and poor surface water management during and after construction.

In Australia, AS2870-2011 [1] is the relevant standard for analysis, design and construction of residential slabs and footings. Unfortunately, there have been some recent reports of damages to hundreds of houses supported by waffle slabs (designed to AS2870) on highly reactive soils of Western suburbs of Melbourne, Victoria, Australia. Site investigations have confirmed excessive slab differential movements as being responsible for reported cracking and damages to houses beyond their serviceability limits. This study investigates some relevant aspects of current design practice and philosophy with the focus on soil–slab interaction analysis and the performance of waffle slabs.