Appraisal and Repair of Timber Structures - download pdf or read online

By Peter Ross

ISBN-10: 0727720511

ISBN-13: 9780727720511

Bushes is without doubt one of the oldest of mans construction fabrics, yet as the development scene at the present time is ruled through concrete and metal, many designers are unexpected with the homes of bushes and its structural vocabulary.

This new e-book starts off with a longer creation to bushes as a development fabric: its quite a few types and homes, its reaction to environmental stipulations, and the construction laws when it comes to its use. It is going directly to keep on with the overall series of labor, beginning with the fee, after which facing the survey, the research and the appraisal

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Additional info for Appraisal and Repair of Timber Structures

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The building-in of softwood joist ends to solid walls is probably the major cause of rot in properties of the nineteenth century and earlier. The dampproof course and the cavity wall came increasingly into use after the ®rst World War, and resulted in a marked reduction of the decay risk of the internal timber, in e€ect placing most joist ends in Class 1B. The timber ¯at roof, however, especially as it was often detailed and constructed in the 1960s (perhaps even in conjunction with a Class 2A environment), placed the whole of the roof structure ®rmly in Class 2B.

42 density (increasing as density increases) moisture content (increasing as the MC decreases) duration of load (increasing as load duration shortens). The characteristics of timber Fig. 9 The relation between maximum bending stress and duration of load (the Madison Curve) Strength-reducing defects All these tests have been based upon small clear specimens, which are convenient for laboratory work. Structural timbers are much larger, and because of their size inevitably include some of the characteristics of growth which will reduce the member strength, and which are generally known as defects.

9). The strength properties which have been looked at so farÐbending and compressionÐhave given quite high results. In fact, if a comparison is made on a strength/weight basis, the specimens out-perform mild steel. However, these are the `with-grain' properties of `clear' timber. Tests for shear strength and compression perpendicular to the grain, give markedly lower results. Going back to the bundle of straws analogy, shear strength is related to the rubber bands, modelling the relatively weak bonding e€ect of the cells in the radial direction, and a compression force perpendicular to the grain crushes the straws, which represent the cell walls.

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Appraisal and Repair of Timber Structures by Peter Ross


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