Damage reasons analysis of PT cables blister in road bridge / Michał Gałuszka, Piotr Gwoździewicz, Magda Lubecka, Michał Betlej, Henryk Ciurej // W: Fib 2018 : Better, Smarter, Stronger : proceedings ... więcej

Damage reasons analysis of PT cables blister in road bridge / Michał Gałuszka, Piotr Gwoździewicz, Magda Lubecka, Michał Betlej, Henryk Ciurej // W: Fib 2018 : Better, Smarter, Stronger : proceedings for the 2018 fib Congress held in Melbourne, Australia, October 7-11, 2018 / eds. Stephen Foster [et al.]. – Lausanne : Fédération internationale du béton (fib), 2019. – S. 3679-3689 : fot., rys., schem., tab. – Bibliogr. s. 3689, Abstr. – Data cop. 2019. – Tyt. źródła wg okł. – ISBN 978-1-877040-15-3

Analysis of the reasons for the damages of a blister working as an anchorage area for two prestressing cables in a bridge structure is the subject of this work. The selected problem constitutes an actual ... więcej

Analysis of the reasons for the damages of a blister working as an anchorage area for two prestressing cables in a bridge structure is the subject of this work. The selected problem constitutes an actual research direction. The reinforcement of the Anchorage areas and the bister shaping as well as its work in connection to the adjacent concrete requires an advanced numerical analysis in particular when the blister houses two or more cable anchorages. The common design practice follows the use of the simplified formulas as well as reinforcement solutions for every Anchorage separately. Nevertheless under the set of several anchorages in the volume of one blister the stress fields overlap each other and in such circumstances the analysis should be carried out with the use of more advanced methods and tools. In the paper the morphology of the damages layout of one blister (cracks pattern) is presented together with the damages reasons. The anchorages area was modelled in the FEM software as a volume with the reinforcement. The numerical model was built with the use of the non-linear constitutive law for concrete (smeared cracks model) and steel. The concreto volume was represented by the finite elements of the type HEX8, reinforcement was described with the use of truss elements. In result of the analysis, maps of the principal tensile stress were obtained together with the cracks pattern, which followed the crack layout observed in the real structure.