Author: Preston, Frank A B
First published: N/A
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Preston, Frank A B
THE object of this paper is to enable the designer of Hollow Reinforced Concrete
sections of circular and rectangular shapes to ascertain, with the minimum of calculation, what is a suitable section to adopt.
Gerald C. Gumersall
THE Hawkes Bay district of New Zealand was visited by devastating earthquakes on February 3rd and 13th, 1931, which resulted in the virtual destruction of the business centre of the city of Napier and the partial destruction of the town of Hastings, 12 miles distant. Adjacent towns and villages also suffered great damage. The whole of a widespread area was grievously disturbed; 260 lives were lost, and the number of injured persons was considerable. The damage to properties and contents was estimated at between three and four millions. The havoc and devastation were comparable only to t h a t wrought in towns and villages in Flanders after heavy and continuous bombardment during the Great War.
SIR,-with reference to Mr. Procter’s interesting paper on “Laterally Unsupported Beams” in your July issue, I note that the adopts for J the effective polar moment of
inertia for an I-beam section in torsion, the approximate formula ...