is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is
A)f = (P/A) +(Z/M)
B)f = (A/P) +(M/Z)
C)f = (P/A) + (M/Z)
D)f = (P/A) + (M/6Z)

Question

Quizplus · Accepted Answer

The correct formula for calculating the maximum stress in a pre-stressed beam, considering both the pre-stressing force and the bending moment, is $f = \frac{P}{A} + \frac{M}{Z}$, where $P$ is the pre-stressing force, $A$ is the area of the cross-section, $M$ is the maximum bending moment, and $Z$ is the sectional modulus. This formula combines the stress due to pre-stressing ($\frac{P}{A}$) and the stress due to bending ($\frac{M}{Z}$).

Is the Pre-Stressed Force Applied to the Tendon of a Rectangular