Innovative detailing for shear in concrete using high performance materials

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Existing shear design models for reinforced concrete use a stress-based compositional approach to member strength, from both a concrete contribution and from a shear reinforcement contribution based on a truss analogy. These models limit the maximum strength of the shear reinforcement permitted in design, in order to limit crack widths at failure. Maximum spacing of the shear reinforcement is defined by empirical rules based on an assumed angle for the internal truss. Limited studies since the 1960's have shown that safe designs are possible when either of these criteria are relaxed. Improved capacity models for shear that directly consider both the shear reinforcement strains and spacing, will permit economical and safe use of modern, durable reinforcement materials as stirrups.