Question

Beams of uniform strength vary in section such that

• A. Bending moment remains constant
• B. Deflection remains constant
• C. Maximum bending stress remains constant
• D. Shear force remains constant

Answer 1

Answer:

C. Maximum bending stress remains constant

Beams of uniform strength have constant maximum bending stress across their length. The stress varies with the bending moment and section modulus. The section of the beam may be varied by changing the depth or width or both to ensure sufficient strength. The greatest tensile and compressive stresses at the critical section should not exceed their allowable stresses.