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Title: Effect of Deferred Initial Loading and Percentage of Steel on Time-Dependent Losses and Deformations of Prestressed Members

Author(s): T. K. Bandyopadhyay and B. Sengupta

Publication: Structural Journal

Volume: 85

Issue: 2

Appears on pages(s): 190-205

Keywords: age; beams (supports); compression; creep properties; creep recovery; deflection; deformation; loads (forces); stiffness; modulus of elasticity; prestressed concrete; prestressing steels; shrinkage; stress relaxation; warpage; Structural Research

DOI: 10.14359/2754

Date: 3/1/1988

Abstract:
Time-dependent deformations, particularly curvature and deflection of prestressed concrete beams, are calculated by applying total losses due to elastic compression, shrinkage, and creep of concrete, and relaxation of steel for different loading conditions with due consideration of steel percentage. A quantitative study of the analysis done by a numerical method using a computer compares the effect of deferred loading and percentage of steel on losses and deformations of prestressed members. The method considers stiffness coefficient, creep coefficient, aging coefficient, time-variable modulus of elasticity of concrete, date and period of loading, and recovery of losses. Experimental deformations (curvature and deflection) of prestressed concrete members show good agreement with the theoretical values obtained through the proposed computer-aided step-by-step analytical method.