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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Models ofr the interaction tendon-concrete in unbonded prestressed concrete structures
Author(s): Murcia Vela, J.
Appears on pages(s): 63 - 75
Abstract:In principle, this paper tries to answer to the question of what happens before the tendon begins a free sliding with friction, relatively to the duct, in unbonded prestressed concrete structures; for that, an 'elastic locking' mechanism can be proposed. Combining both mechanisms, elastick locking and simple friction, on the basis of a t-u (unit tangencial force - relative displacement) relationship, an elasto-plastic model is got, more suitable than the rigid plastic one (perfect bond and simple friction). Structural analysis with this model has been set; and also a simple beam example has been solved for having practical results and getting the zones in which this model is no more calid and simple friction model must be used; results for this last one and for perfect bond hypothesis are also shown. It is concluded that, in practice, structural analysis can be only based on the simple friction model; its results are just slightly modified in discontinuity zones. Then, a general basis for studying structures composed by other materials is reached; in particular those having such a interaction that elastic locking has already a wider incidence and must be explicitely considered. And even, changing the t-u law, bonded structures (including reinforced concrete ones) can also be studied in phases in which bond tends to fail; for instance, in cases of safety re-evaluation a bond fault and others concerning refined structural analysis.
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