Author: Hiley, B A E;Craemer, Hermann
First published: N/A
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Hiley, B A E;Craemer, Hermann
Sir,-Mr. Bolton has recently pointed out in your columns that in an article dealing with the solution of continuous ridged portal frames, no example with a north light type of roof or with unsymmetrical load on the rafters was given, and goes on to say that the calculations of fixed-end constraints and of the effect of unit operations for such conditions makes a solution much more difficult.
The distribution of stresses in old and new concrete in compound sections is examined for an instantaneous load, after which the redistribut.ion of stresses under sustained load and shrinkage is described. The redistribution of stress which takes place in statically indeterminate structures when their individual members are cast independently and connected later is discussed.
Professor Dr. Ing. H. Craemer
In 1950 the Ministry of Works called for competitive designs and estimates for eight prestressed concrete tanks, each tank to have a capacity of 430,000 gallons, with a maximum depth of liquid of 33 feet, giving an internal diameter of 50 ft. o in.
Colonel A. Raymond Mais