The maximum lengths for simple-span pretensioned composite girders were investigated analytically using concrete strengths varying from 6 to 15 ksi (41 to 103 MPa), and prestressing strands of 0.5 in., 0.5 in. modified, and 0.6 in. (12.7, 12.7 and 15.2 mm) diameter. Both AASHTO and NU (developed by the University of Nebraska) sections were investigated. Girder spacings were varied from 5 to lift (1.5 to 3.4 m). Use of the 0.6 in. (15.2 mm) diameter strand was more efficient and provided maximum spans up to 40 percent greater than 0.5 in. (12.7 mm) diameter strand. The strength of the deck did not significantly affect the maximum span, and the strength of the girders at release affected maximum span length more at lower design strengths than at strengths greater than 12 l
