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During the last two decades considerable attention has been given to prestressed concrete, and these two words have become almost inseparable. Actually, prestressing
is a physical principle which has been used for thousands of years, although it was not recognised as such, and this physical principle is not confined to concrete.
Felix J. Samuely
FOR many years, jetties and other light piers were, by tradition, built in timber. This material, however, presents difficulties in maintenance, is subject to rot and prone to attack from the teredo which all contribute in shortening thc life of timber structures. Consequently it seemed reasonable to replace timber by ferro-concrete.
Mr. F. T. Middleton (Member) asked what, in United States practice and taking 30 storeys as a maximum, was approximately in the author's estimation and experience the weight, cost and erection speed differential between a high strength bolted structure and a comparable site-welded partially bolted structure?