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2 2015

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Porównanie wymiarowania żelbetowych przekrojów mostowych według norm PN-S-10042:1991 oraz PN-EN 1992

100%

Oleszek R. , Radomski W.

Archiwum Instytutu Inżynierii Lądowej

2015

tom Nr 19

205--226

Concrete is a dominant structural material in the Polish bridge engineering. Therefore, the codes applied for designing of RC bridge structures are of prime importance influencing their structural solutions with respect to safety and durability as well as economy. In the paper, fundamental differences between dimensioning of RC bridge cross-sections performed using previous Polish standard PN and obligatory at present standard PN-EN (based on Eurocode 2) are discussed, especially with respect to the Ultimate Limit State (ULS) and Serviceablity Limit State (SLS). The discussion is exemplified by calculations of several types of RC cross-sections most frequently applied in bridge engineering. The calculations show some controversial results concerning among others a considerable differences in the amount of reinforcement required to fulfil a relevant conditions in the above two standards. Some more general conclusions which seem to be useful for bridge designers are also formulated at the end of the paper.

Experimental verification of the concrete shrinkage strains course according to En 1992-2 standard

88%

Raczkiewicz W. , Bacharz M. , Bacharz K.

Advances in Materials Science

2015

tom Vol. 15, nr 2(44)

22--29

The article provides basic information about the shrinkage of concrete and discusses the major impact on the size and course of the shrinkage. There are the guidelines to estimate the shrinkage strain of concrete bridge structures for the high tensile strength-SCI in accordance with PN-EN 1992-2. The article presents the results of experimental studies which aim was to analyze the course of shrinkage in two types of specimens made of different composition mixes. The studies have also made possible to verify the actual size of the shrinkage strain and designated ones on the basis of the PN-EN 1992-2.