Shear Behavior of Concrete Slabs Longitudinally Reinforced with High-Performance Steel

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Title: Shear Behavior of Concrete Slabs Longitudinally Reinforced with High-Performance Steel

Author(s): Admasu S. Desalegne and Adam S. Lubell

Publication: Structural Journal

Volume: 107

Issue: 2

Appears on pages(s): 228-236

Keywords: concrete slabs; high-performance steel; shear; size effect; strain effect.

Date: 3/1/2010

Abstract:
To efficiently use the strength of high-performance reinforcement in concrete slabs, sectional shear design models must account for the higher expected reinforcement strains. This paper presents laboratory test results for six shear-critical slab strips longitudinally reinforced with high-performance steel conforming to the ASTM A1035 standard but without web reinforcement. Overall heights up to 600 mm (23.6 in.) and a constant shear span-depth ratio of 3.5 were used. The influence on shear capacity from the longitudinal steel reinforcement ratio, nonlinear response of the steel, and the member depth are investigated. The load-deflection response, ultimate load-carrying capacity, and mode of failure were of primary interest. The test results and other published data were compared against capacity predictions using several analytical and numerical shear design models. Improved predictions were obtained from models that could account for the influence of reinforcement strains and member depth on shear capacity. A simplified shear design model was developed and validated for use with members where the longitudinal reinforcement is proportioned on the basis of 690 MPa (100 ksi) steel yield strength.