The Use of Arc Welding in Structural Engineering

Introduction The expression a p - S = U is used in a method of calculating the equilibrium moisture distribution in soils, where a = a compressibility factor; S = the suction characteristic of the soil; U = the pore water pressure relative to the position of the water-table;and P = the pressure due to the overburden above the zone under consideration. The value p can also include any surface loading n due to a road, runway, or light structure, i.e., p = h Dw, + n, where h = depth from the surface to the centre of the zone: Dw = Dd (100 + m)/ 100 = bulk density of the soil,and Dd is the dry density: m = a value of moisture content assumed as a first approximation (this may be adjusted when the equilibrium moisture contents have been estimated once, by choosing the new value of m to give a better estimate of Dw). E. LL. Morgan

The Institution welcomes as President for the Session 1958-1959 Mr. G. S. McDonald, M.I.Struct.E., M.I.C.E., M.I.Mun.E., who takes office on the 2nd October.

A brief introduction states the proportion between structure and total building cost and considers the effect of ancillary buildings on hangar design. A description is then given of aluminium as a structural material followed by a detailed account of the design of a 200 ft. span aluminium hangar. Unusual features of three other types of aluminium hangar are then given. Tubular steel as a structural medium is discussed and illustrated by a description of a 150 ft. two way span tubular steel hangar. Conclusions are stated and a bibliography given. L.E. Ward