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June 2023
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Viggiani fondazioni pdf6/2/2023 Some Remarks on the Optimum Design of Piled Rafts. However, once the decision has been taken that piles are required, the traditional capacity based design approach is generally adopted, imposing that the total structural load is carried by the piles with a nominal safety factor against a bearing capacity failure. (1977) pointed out that in the majority of practical cases the primary reason for adopting a piled foundation is to reduce settlement. Introduction As early as 25 years ago, BURLAND et al. In both cases, it is shown that substantial savings can be achieved in respect to the present design approach, by considering the raft-soil-pile interaction. In the former case, the primary reason to add piles is that of achieving a sufficient factor of safety in the latter the addition of piles is essentially intended to reduce mean and/or differential settlement. It is suggested that different criteria should be applied for "small" and "large" piled rafts. The present paper discusses the guidelines for an optimum design. The search for design criteria more rational and economic of the conventional ones is thus justified. Satisfactory methods of analysis of the raft-pile-soil interaction are available by now.
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