ALTERNATIVE LINEAR ELASTIC DESIGN
Helix Steel and ICC-ES have developed a simplified design method for Helix® reinforcement that uses linear elastic design along with simple inexpensive flexural testing (ASTM C78). This takes advantage of the proactive benefit Helix® reinforcement offers in concrete – its ability to increase the average modulus of rupture and consistency of test results.
ICC-ES ESR-3949 is able to provide an alternative approach for structural concrete and should be used for Helix® reinforcement design when it is specifically required by building jurisdictions. This approach is applied to structures that meet the limitations of ACI 318-14, Chapter 14.
Flexural test data is used to determine design tensile capacity and resistance factor in accordance with ICC-ES ESR-3949. The design flexural limits are computed using simple linear elastic design principles (Figure 1 and Equation 1) with an adjustment for size effect and a capacity reduction factor to ensure compliance with the requirement of ASCE 7-14. The report also evaluates post-crack tensile capacity and freeze/thaw resistance of concrete with Helix® reinforcement. It is the only approach that provides the engineer with a simple and cost-effective way to verify design values in the field with ASTM C78 tests.
ICC-ES is a nonprofit, limited liability company that does technical evaluations of building products, components, methods, and materials. The evaluation process culminates with the issuance of technical reports that, because they directly address the issue of code compliance, are extremely useful to both regulatory agencies and building-product manufacturers.
Click below for the Helix Steel
ICC-ES Evaluation Report