By Lawrence Martin, John Purkiss

ISBN-10: 0080454674

ISBN-13: 9780080454672

ISBN-10: 0750650591

ISBN-13: 9780750650595

The transition from nationwide criteria for concrete structural layout to Eurocode EN 1992 is the most important switch to concrete layout for decades.

This new version of Concrete Design explains the foremost adjustments among BS8110 and EN1992, and teaches the basics of the layout of concrete buildings to conform with the Eurocodes.

With many illustrations and labored examples, this available textbook teaches the necessities of concrete layout to EN1992 to scholars and execs alike.

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Extra resources for Concrete Design to EN 1992, Second Edition

Sample text

The 28-day strength is approximately 80 per cent of the strength at one year, after which there is very little increase in strength. Strengths higher than the 28-day strength are not used for design unless there is evidence to justify the higher strength for a particular concrete. The characteristic tensile strength of concrete is the uniaxial tensile strength ( fct,ax) but in practice this value is difficult to obtain and the split cylinder strength ( fct,sp) is more often used. The relation between the two values is ( fct,ax) ¼ 0,9 ( fct,sp).

7). From the geometry of Mohr’s circle, the direct stress () and the shear stress () are related to the tensile strength of the concrete ( ft) ½ð=2Þ2 þ  2 Š0,5 À =2 ¼ ft rearranging to form Eq. 5, EN =ft ¼ ð1 þ =ft Þ0,5 ð2:10Þ This expression becomes unsafe as the direct stress increases (Fig. g. the shear strength of webs of prestressed beams. Principal tensile stress criterion Shear stress t (MPa) EN limit When the direct stress exceeds the limit (Fig. 7, EN) as the direct stress approaches compression failure.

Ideally, loads applied to a structure during its working life should be analysed statistically and a characteristic load determined. The characteristic load might then be defined as the load above which no more than 5 per cent of the loads exceed, as shown in Fig. 1. However data is not available and the characteristic value of an action is given as a mean value, an upper or lower value or a nominal value. Guidance on values is given in EN 1990 (2002), Pts. 1-7. g. g. g. explosions or impact from vehicles.

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Concrete Design to EN 1992, Second Edition by Lawrence Martin, John Purkiss

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