Loss of Prestress and Camber of Non-Composite and Composite Prestressed Concrete Structures, June 1970

(1970) Loss of Prestress and Camber of Non-Composite and Composite Prestressed Concrete Structures, June 1970. University of Iowa

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Abstract

A systematic procedure for predicting the material behavior of different weight concretes and the time-dependent sfructural response of non-composite and composite prestressed concrete structures is presented. Continuous time functions are provided for all needed parameters, so that the general equations presented for predicting loss of prestress and camber readily lend themselves to computer solution. Results computed by the materiai parameter equations are compared with representative data in the literature for normal weight, sand-lightweight, and all-lightweight concrete. Results computed by the loss of prestress and camber equations are compared with experimental data for a sand-lightweight composite bridge, and with data in the literature for non-composite and composite_ structures constructed of normal weight, sand-lightweight, and all-lightweight concrete. Both laboratory specimens and actual structures are included in these comparisons. Ranges of variation are also shown for the material behavior, loss of prestress, and camber results. Sample calculations are also included.