Shear Capacity of Beams Made of High-Performance Concrete


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Title: Shear Capacity of Beams Made of High-Performance Concrete

Author(s): J. Hegger, A. Sherif, and S. Gortz

Publication: Special Publication

Volume: 228


Appears on pages(s): 723-740

Keywords: aggregate interlock; design model; high-performanceconcrete; shear

Date: 6/1/2005

The shear capacity of stirrup-reinforced concrete elements consists generally of a portion modeled by a truss Vtruss and an exceeding concrete contribution Vc. Recent research results assign a portion of the concrete contribution to the effect of aggregate interlock. After shear cracking, a relative displacement of the crack edges occurs activating friction forces upon the rough crack edges with increasing load. In such a model the concrete contribution is considered solely by a more flat strut inclination , and accordingly a truss model can describe the whole shear-capacity. In addition, the shear behavior of high strength concrete is different than ordinary concrete, presumable due to the different shear transfer mechanisms across the shear cracks. However, the experimental and theoretical investigations conducted show that the truss model only describes a part of the whole shear capacity. There is an exceeding remaining load-bearing system. Based on the research results a design model for shear is developed which is applicable for high performance as well as ordinary concrete.