By H. J. Andrews and Jack Kape (Auth.)
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Additional info for An Introduction to Timber Engineering
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. Design Considerations T h e Codes of Practice deal fully with those points which should be taken into account by the engineer at the design stage, and it is necessary, therefore, that this section should receive close attention. S. 1860 Structural Softwood and Measurement of Characteristics Aff'ecting Strength, and are based on the following. e. specimens free from defects).
Available informa tion indicates that exposure of wet wood for a year to a temperature of 180°F will result in a substantial permanent loss in strength and that a significant strength loss may occur with a year's exposure at 150°F. Dry wood is damaged less than wet wood. Shock resistance is affected most, bending strength next, and stiffness the least. N o practical protection has yet been found against the damage effected by continuous exposure to high temperatures, and conservatism in design for such conditions is recommended.
These documents are of very recent issue, and represent the latest developments and techniques in Britain o n timber engineering. Basically to join two or more pieces of timber together by gluing using a suitable adhesive, generally after consultation with the relevant Code of Practice and the glue manufac turers, the following basic procedure is necessary. (1) Timber must be stress graded in accordance with the design requirements. (2) It must be kiln dried to a moisture content normally 12 ± 3 per cent.
An Introduction to Timber Engineering by H. J. Andrews and Jack Kape (Auth.)