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Study of Rapid Inspection Method for Under-Anchorage Effective Prestress in Prestressed Beams
Author(s): 
Pages: 42-46
Year: Issue:  4
Journal: World Bridges

Keyword:  prestressed reinforced concrete bridgebeam bridgeeffective prestressrapid inspectionreverse tensioninga whole bundle of prestressindividual prestressing tendon;
Abstract: Given that the reverse tensioning inspection method is not possible to directly check the tensioning force of individual prestressing tendons by inspecting a whole prestressing bundle and the inspection efficiency is low,the study of a rapid inspection method for under-anchorage effective prestress of the prestressed beam is conducted based on the existing reverse tensioning inspection method.In the new method,the load bearing conditions of individual prestressing tendons during the reverse tensioning of the whole bundle of prestress were examined in the contexts of being tightened and loosened.If an individual prestressing tendon is loose,the rigidity of the whole bundle of prestress would change.Therefore,the tensioning load~displacement curve of the whole bundle of prestress can be directly used to deduce the relatiional expression of the tensioning force of each prestressing tendon in a bundle,and based on which the under-anchorage effective prestress is calculated.Engineering practice proves that the method is able to directly test the tensioning force of individual prestressing tendons in a bundle by inspecting the prestress of the whole bundle and can effectively expedite the efficiency of prestressing tendon inspection on the premise that the inspection precision is guaranteed.
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