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Title :Durability of preflex beam under cyclic loading
Authors :Nasiri, Ahmadullah
Shimozato, Tetsuhiro
Issue Date :2021
Abstract :Preflex beam girders with remarkable advantages are widely used in bridge structures. With aging, preflex beam bridges undergo concrete cracking and degrade as the cracks propagate and deteriorate due to repeated service load application and exposure to humid and saline environment. The objective of this study was to evaluate concrete cracking, changes in prestress, and consequent changes in sectional properties as the preflex beam undergoes deterioration in its concrete casing under cyclic loading. The experimental study investigated the behavior of a preflex beam specimen under multiple cyclic loading ranges, reproducing different deterioration levels in the concrete casing of the specimen. Relating concrete deterioration to resulting changes in the girder’s structural behavior, the study outlined recommendations for monitoring approaches in actual bridges. The study concluded that with advancement in concrete deterioration, the preflex beam girder loses prestress that results in reduced strength of the girder and remarkable changes in its sectional properties. The study also concluded to minimize prestress loss and changes in sectional properties of the girder, closer spacing for shear ribs welded to the lower flange can be helpful.
URL :https://doi.org/10.1016/j.jestch.2021.03.003
Type Local :雑誌掲載論文
ISSN :2215-0986
Publisher :Elsevier
URI :http://hdl.handle.net/20.500.12000/49988
Citation :Engineering Science and Technology, an International Journal Vol.24 no.6 p.1361 -1372
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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