Strap Steel for Prestressed Concrete Structures


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Title: Strap Steel for Prestressed Concrete Structures

Author(s): K. P. Milbradt

Publication: Journal Proceedings

Volume: 50

Issue: 1

Appears on pages(s): 357-363

Keywords: no keywords

Date: 1/1/1954

A new type of prestressing steel - strap steel - is introduced as offering possible economy for this type of construction. Tempered spring steel, 0.048 x 0.625 in., having an average ultimate strength of 215,000 psi and a yield strength of 182,000 psi were used. Economical prestressing clamps were developed. This type of prestressing was then applied to a test beam. Specific conclusions from the test were: (1) the strap was easily handled, placed, clamped, and stressed either singly or mutiply in one operation; (2) bond was sufficient to transfer the prestressing force; and (3) ultimate load deflection for the test beam was obtained with little elongation of the steel.