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

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Additional resources for An Introduction to Timber Engineering

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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. T h e r e is an immediate, temporary weakening while the fibres of the wood are at the high tem­ perature. It should be observed, however, that the insulating properties of wood rapidly slow down the transfer of heat from the surroundings to the interior fibres so that these fibres remain at a comparatively low temperature.

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. N o attempt has been made to indicate the design procedure, all of which will be covered in later chapters which deal with this subject in detail. At the present time we are attempting only to establish some principles on the interpretation of loading as applied to simple design problems.

Table 4 in C P . 3, Chapter V, shows that, for 35° pitch, the wind loads on the windward side are negligible and those o n the leeward side, being approximately 0 4 5 P , which, at 30 ft above ground level, would result in an upward force less 38 CODES OF PRACTICE than the weight of a normal roofing tile and can, therefore, be ignored. In Fig. 8 an intermediate rafter is shown supported by a purlin and the loads indicated are built u p from the knowe d g e that the rafters are spaced at 18 in. centres and are.

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