The discussion focuses on calculating tensile stress using a strain gauge with a gauge factor of 2.0 and an unstrained resistance of 120 ohms. The strained resistance measured is 120.13 ohms. To calculate tensile stress, one must first determine the change in resistance, which is 0.13 ohms, and then apply the formula for tensile stress using the gauge factor. The relationship established is that the relative change in resistance is twice the strain experienced by the steel girder.
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