The Structural Engineer > Archive > Volume 29 (1951) > Issues > Issue 8 > Prestressed Concrete Developments at the Field Test Unit, Thatched Barn Discussion on Mr. 0. J. Mast
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Prestressed Concrete Developments at the Field Test Unit, Thatched Barn Discussion on Mr. 0. J. Masterman's Paper

Professor A. L. L. BAKER (Member of Council), proposing a vote of thanks to the lecturer, said it seemed to him, on looking at the tables, that the most significant results were that in beams having a factor of safety of about 1.5 against cracking, a factor of safety against failure of about 3 had been obtained fairly consistently. That seemed to be very satisfactory, because if prestressed work was carried out under factory conditions of control of concrete, it should be possible to maintain consistently a standard of concrete which would justify designing to a safety factor of 3. In the course of time, he hoped it would be possible to have such control of concreting in the field that working to a factor of safety of 3 would be justified.