Szukana fraza: [Abstrakt = "The paper deals with the authors experiences connected with estimation of force in bridges’ tendons. Particular attention was paid to the external postensioning cables in reinforced concrete bridges. Discussion about an influence of measurement errors for assessment of a force, identified through measured eigenfrequency in a tendon is described. Problems with definition of the theoretical length, mass of tendon and boundary conditions are discussed.the structure. The described case of prestressing cable failure shows the significance of correct cable duct grouting for protection of cables against corrosion."]

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