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.