By H. J. Andrews and Jack Kape (Auth.)
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Extra info for An Introduction to Timber Engineering
5) T h e surfaces brought into close contact within the assembly period of the glue. 51 AN INTRODUCTION TO TIMBER ENGINEERING (6) Cramping procedure is applied during the closedassembly period. P. and glue manufacturers* recom mendations. (8) A suitable curing period is allowed after removal from the cramps, again in accordance with the Codes and related to the size of the unit under construction. It is not intended that the above points should be taken as an over-simplification of the techniques of gluing, but pro viding each point is examined and given d u e consideration first-class work can be obtained without fear of structural failure.
In connectored work, moisture content is of less conse quence providing it is within the recommendations of the Code, but here again connectored units standing e x p o s e d to rain can take u p moisture, causing swelling, compression of the fibres under the bolted areas where swelling is prevented and an ultimate shrinkage when finally dried out and in 28 CODES OF PRACTICE position. This can result in loose bolts and in some cases will cause excessive inidal deflexion of the structure. It is an essential requirement that bolted assemblies should be checked after a period of, say, six months or following a dry spell after erection.
Moment of resistance For nominal size For scant size MR = fZ MR = 1000 X 12 = 12,000 lb/in. MR = 1000 X 10-78 = 10,780 lb/in. If we now take the m o m e n t of resistance of the scant size member and divide by the Ζ value for the nominal member = 10,780/12 we produce a reduced s t r e s s / o f 900 Ib/in^. This exercise indicates clearly that the scant dimensions of timber have an appreciable eflFect on the carrying capacity, which can be related to the basic and working stresses used in calculations.
An Introduction to Timber Engineering by H. J. Andrews and Jack Kape (Auth.)