An Introduction to Timber Engineering by H. J. Andrews and Jack Kape (Auth.)

By H. J. Andrews and Jack Kape (Auth.)

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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. Casein glues are easier in application, will set at lower temperatures and are not so sensitive to timber conditioning. T h e y are, however, limited to internal use although possess­ ing a degree of water repellance which is sure to be encoun­ tered at some time during the early stages of construction on site.

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. TABLE 4. MODIFICATION I ACTORS FOR LAMINATED MEMBERS No. ipplv to hui t u p battened or latticed struts for which special (alciilations are required. Immediately following the modification factor tables, there are certain recommendations for flexural members, all of which are sound and should be accepted, excepting only where the designer feels justified in making changes, having satisfied himself that the stability of the structure will not he endangered.

8. therefore, loaded at 26 X 1-5 ft = 39 lb/ft on plan, half of which is applied at the purlin point and the remainder at the ridge, loads on two opposite rafters resolve themselves into compression forces direcdy down the line of rafters and will be accommodated by the traditional method of nail­ ing at this point. T h e load at the purlin will be resolved, as previously described, by forces normal to the roof slope and perpendicular to it. T h e perpendicular load will be trans­ mitted directly into the purlin and that load normal to the roof slope is conveyed down the rafter to the wall plate.

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