Longitudinal Steel Stresses in Beams Due to Shear and Torsion in AASHTO-LRFD Specifications

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Title: Longitudinal Steel Stresses in Beams Due to Shear and Torsion in AASHTO-LRFD Specifications

Author(s): Khaldoun N. Rahal

Publication: Structural Journal

Volume: 102

Issue: 5

Appears on pages(s): 689-698

Keywords: beams; bond; longitudinal reinforcement; prestress; shear; strain; stress

Date: 9/1/2005

Abstract:
The alternative shear and torsion design method (the general method) in the current AASHTO-LRFD specifications and the Canadian A23.3 CSA building code requires a check on the adequacy of the longitudinal steel to resist the stresses not only from bending and axial loads, but also from shear and torsion. This paper presents an evaluation of the general method equation for the calculation of the stresses in the longitudinal steel in members with adequate transverse reinforcement. Longitudinal steel strain readings from tests are compared with the values calculated based on the general method equation for longitudinal force. The study covers the cases of nonprestressed members subjected to combined shear and/or torsion and to prestressed and nonprestressed members subjected to combined torsion and bending. The general method equation is found to give satisfactory results.