Abstract
Limit state design was introduced into some standards in the early 1970s followed by expansion of limit state design into all our structural standards. With pad footings, limit state design is only applied to the structural design components such as thickness of the footing, size and distribution of reinforcement required to resist moments and shear forces. However, the size, ie. contact area of the footing required to transmit column loads is determined by working strength techniques whereby a predetermined allowable soil bearing pressureqa is used to transmit the applied permanent action (dead) loads(G) and superimposed action (live) loads (Q). There appears to be a contradiction in two different approaches applied concurrently in footing design. This article considers the application of limit state design method for determining size of rectangular pad footings.
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