ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Prediction and Control of Initial Deflection in Partially Prestressed Post-Tensioned Beams with Unbonded Tendons

Author(s): P. R. Chakrabarti

Publication: Symposium Paper

Volume: 161

Issue:

Appears on pages(s): 197-242

Keywords: beams (supports); cracking (fracturing); deflection; moments of inertia; partial prestressing; post-tensioning; prestressing steels; span-depth ratio; T-beams; unbonded prestressing; Structural Research

DOI: 10.14359/1503

Date: 4/1/1996

Abstract:
In this project, an attempt is made to study the instantaneous load- deflection behavior of partially prestressed beams with unbonded post- tensioning tendons. Thirty-three beams with the following variables were tested: different mixes of reinforcing and prestressing steel, T-beams and rectangular beams, normal and high-strength concrete, low and high ratios of span/depth, and different effective stresses in tendons. Cracking was observed and deflections measured at precracking and postcracking stages. A suitable method for deflection calculation at precracking and postcracking stages is proposed. The proposed deflections and the deflections obtained by current ACI 318-89/92 code equations are compared with the measured deflections.