Punching Shear Behavior of Two-Way Slabs Reinforced with High-Strength Steel

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Title: Punching Shear Behavior of Two-Way Slabs Reinforced with High-Strength Steel

Author(s): Jun-Mo Yang, Young-Soo Yoon, William D. Cook, and Denis Mitchell

Publication: Structural Journal

Volume: 107

Issue: 4

Appears on pages(s): 468-475

Keywords: cracking; fiber-reinforced concrete; high-strength reinforcement; punching shear; slabs; stiffness

Date: 7/1/2010

Abstract:
The punching shear behavior of slabs reinforced with high-strength steel reinforcement was studied and compared with that of slabs reinforced with conventional steel reinforcement. The high-strength steel selected for this research conforms to ASTM A1035-07. The influences of the flexural reinforcement ratio, concentrating the reinforcement in the immediate column region, and using steel fiber-reinforced concrete (SFRC) in the slab on the punching shear resistance, post-cracking stiffness, strain distribution, and crack control were investigated. In addition, the test results were compared with the predictions using various design codes. The use of high-strength steel reinforcement and SFRC increased the punching shear strength of slabs, and concentrating the top mat of flexural reinforcement showed beneficial effects on post-cracking stiffness, strain distribution, and crack control.