By H. J. Andrews and Jack Kape (Auth.)
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Additional resources for An Introduction to Timber Engineering
Recom m e n d e d working stresses contain a factor of safety to provide for the effects of temperature ranges in ordinary construc tion, and usually no further consideration of temperature is necessary. Tests of wood conducted at about —30()°F show that the important strength properties of dry wood in bending and in compression, including stiffness and shock resistance, are much better at extremely low temperatures than at normal temperatures. Exposure to high temperatures, on the other hand, can weaken wood in two ways.
Sanding of surfaces should be limited to special circumstances, mainly for some species of hardwoods. ADHESIVES T h e structural adhesives used in Britain fall into three main groups being Phenol Resorcinal, Casein, and Urea. Phenol Resorcinal glue possesses all the qualities most desirable in a structural adhesive, including water resistance. It is, as one would expect, an expensive glue and more difficult to apply, requiring strict observance of heat treatment and timber conditioning, but resulting in the best quality glue line and, therefore, product.
Are used. When two pieces o f timber, each say, 2 in. , are j o i n e d to form a 4 in. X 6 in. beam, 6 in. d e e p , the stress grading o f that timber which took place prior to gluing will, in fact, have been based o n a member o f 2 in. X 6 in. dimension. W e now have a member measuring 4 in. X 6 in. which has been graded 32 CODES OF PRACTICE to the rules set down for a m e m b e r 2 in. X 6 in. hence the Κ factors are higher resuldng in increased working stresses pro rata to the number of laminations employed.
An Introduction to Timber Engineering by H. J. Andrews and Jack Kape (Auth.)