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The Structural Engineer, Volume 75, Issue 22, 1997
Professor A. Bolton (F) I was interested to read the paper by Ji and Ellis. The static and dynamic stiffness of temporary structures is very important, as the authors’ results and recent accidents have shown, and when the structure is intended to carry a large number of excited people the effects can be very serious. It is therefore essential for all designers of such structures to take into account both static and dynamic loading and the authors have done well in bringing this matter into clear focus.
Circles and triangles Various members continue to write in with solutions to the problem posed originally by Owen Hope and developed by Graham Orr. Charles Banks has written from Beckenhum in Kent: You published a contribution from Graeme Orr in the 17 June issue which gave a relationship that must be satisfied for the in-circle to have an integral radius, but left the question of which right-angle triangles fulfil this condition open. Some time ago I investigated right-angled triangles with integral sides, and found a way of categorising them which can be used to show that all right-angled triangles with integral sides have integral radii for their in-circles. I doubt that I am the first to do this, but not being a follower of mathematics or number theory, I have not seen it previously.
Since March this year, BRE has been operating in the private sector - a major change after 76 years as a Government or Government-funded organisation. R.M.C. Driscoll