Investigation of width of vertical cracks in reinforced concrete box-girder viaducts

Mindaugas Augonis, Saulius Zadlauskas, Laimonas Krašauskas

Abstract


The article examines the effect of dynamic loads on crack width of decks of prestressed reinforced concrete frame (box-girder) viaducts. The experimental measurement of the changes in width of vertical cracks of Pareizgupis viaduct resulting from the loads of moving heavy weight vehicles was made. During testing, four-axle vehicles with weights of around 40 tonnes were used and they were driven over the viaduct deck at the speed of 20 – 40 km/h. The stresses in prestressed reinforcement were analysed, calculated and compared to the results obtained during testing. Having evaluated theoretically the elastoplastic operation of concrete, the width of a vertical crack was measured in the middle part of the viaduct.

DOI: http://dx.doi.org/10.5755/j01.sace.3.4.3277


Keywords


stressed reinforced concrete; crack width; stresses; precompression; elastoplastic deformations

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Print ISSN: 2029–9990
Online ISSN: 2335–2000