The tensile stress near the bottom of a concrete beam will be the amount of stress it is under in pounds, divided by the cross-section area of pressure.
Although I could not locate the study online and therefore cannot deliver an exact answer, I can provide insight as to the relationship between tensile strength, stress, and psi.
Tensile strength is described as the resistance that a material offers when placed under pressure. Simply put, how much pressure a material can withstand without fracturing determines its tensile strength.
Similarly, tensile stress is the amount of pressure a material is under at a given point in time. To calculate the tensile stress a material is under you must take the force being applied to it and divide it by the cross-sectional area receiving the force. This is usually done in square inches, and from the division is pounds per square inch, we get the term psi.
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