By A. Sarja, E. Vesikari

ISBN-10: 0419214100

ISBN-13: 9780419214106

Concrete constructions will be designed for sturdiness by way of using the rules and approaches of reliability idea mixed with conventional structural layout. This booklet is the 1st systematic try and introduce into structural layout a common concept of structural reliability and current calculation types for universal degradation approaches. It covers either the theoretical historical past and useful layout for provider existence and comprises labored examples which spotlight the applying of the layout technique and techniques.

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Extra info for Durability Design of Concrete Structures (Rilem Report)

Example text

1989): 1. loss of concrete leading to reduced cross-sectional area of the concrete; 2. corrosion of reinforcement leading to reduced cross-sectional area of steel bars. Corrosion may occur: (a) at cracks; (b) at all steel surfaces, assuming that the corrosion products are able to leach out through the pores of the concrete (general corrosion in wet conditions); 3. splitting and spalling of the concrete cover due to general corrosion of reinforcement, leading to a reduced crosssectional area of the concrete and a reduced bond between concrete and reinforcement.

As the values of partial safety factors are calibrated according to the requirement of mechanical safety, the state of Rd being equal to Sd corresponds to the required safety level. ‘Failure’ of Rd being smaller than Sd does not mean a collapse or other mechanical failure, but running under the safety level requirement. Safety in terms of not falling below the safety level is called the durability safety, and is distinct from the mechanical safety. Respectively the term ‘durability failure’ is used distinct from the mechanical failure.

Separated design method (td=165 years) The depth of deterioration of concrete is The minimum thickness of concrete cover is We choose C=45 mm. The depth of corrosion of steel bars at cracks is The hoops must not be broken due to corrosion. Thus the minimum diameter of the hoops is We choose Dh=10 mm. Combined design method (td=125 years) We choose C=40 mm. We choose Dh=10 mm. A check for general corrosion with the chosen concrete cover and diameter of steel bars must still be performed. The chloride content of water is assumed to be so low that corrosion cannot be induced by chlorides.

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Durability Design of Concrete Structures (Rilem Report) by A. Sarja, E. Vesikari

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