Reinforcing Steel — Worked Examples

A reinforcing-bar specimen has a nominal test area of $284\text{ mm}^2$. The reported yield load under the applicable product-test procedure is $124\text{ kN}$. Determine engineering yield stress.

The same bar reaches a maximum load of $188\text{ kN}$. Original gauge length is $200\text{ mm}$ and final gauge length after fracture is $232\text{ mm}$. Determine ultimate engineering stress and elongation.

A deformed reinforcing bar is bent around the specified mandrel through the required angle. After bending, a visible surface crack crosses the outside tensile face. Determine the quality response.

A delivery contains bars of the required nominal diameter, but several bundles have markings that do not match the submitted certificate's manufacturer/grade pattern. Determine the receiving inspection response.

A drawing specifies reinforcing steel using a Philippine project/PNS grade designation, while a supplier submits an ASTM A615 certificate using a nominally similar yield-strength grade. Decide whether the substitution is automatic.

A field crew proposes welding two reinforcing bars because tying is inconvenient. The bars are identified as a common non-weldability-controlled reinforcing grade, and no welding procedure is submitted. Determine the correct response.

Epoxy-coated reinforcing bars arrive with several scraped areas exposing bare steel after unloading. Determine the field QA sequence.

A project uses mechanical couplers for congested column reinforcement. A supplier submits successful qualification tests, but field installers cannot provide lot IDs for several installed couplers. Determine why this is a QA issue.