Maintaining Similitude in Prestressed Microconcrete Models


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Title: Maintaining Similitude in Prestressed Microconcrete Models

Author(s): P. Waldron, S. H. Perry, and M. W. Pinkney

Publication: Journal Proceedings

Volume: 82

Issue: 6

Appears on pages(s): 818-827

Keywords: grouting; interchanges; microconcretes; models; post-tensioning; prestressed concrete; prestress loss.

Date: 11/1/1985

Considerable care is required in the selection of modeling materials, equipment, and techniques to construct and test all types of structural models if similarity with the prototype is to be maintained. However, prestressing at model scale introduces special problems ordinarily not encountered in reinforced concrete models or in similar prototype structures. In post-tensioned prestressed concrete models, further consideration must be given to the gradual application of additional self-weight during stressing, the correct estimation of prestressing losses, and the difficulties associated with grouting small-scale ducts. This paper concentrates on these problems with special reference to the solutions adopted in the design and construction of a complex prestressed concrete model of an elevated urban interchange.