Two structural profiles have the same cross section. The difference between these two profiles, is in the height in relation to the axis that passes through the centroid of the flat surface. Profile A has a height of 20 cm from the centroid, while profile B has a height of 30 cm from the centroid line. Mark the correct answer and explain the reason for the choice. A) Two sections of different shapes, but with the same moment of inertia have equal resistance to bending. B) The profile with a higher height in relation to the centroid has a greater resistance module and, therefore, withstands less flexing efforts. C) Profile A, due to its lower relative height, is more rigid at the bending moment. D) The resistance to the rotation of a part depends exclusively on the moment of inertia of the plane surface of the section. E) The profile with a higher relative height has a greater flexion resistance when subjected to efforts.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Question

Two structural profiles have the same cross section. The difference between these two profiles, is in the height in relation to the axis that passes through the centroid of the flat surface. Profile A has a height of 20 cm from the centroid, while profile B has a height of 30 cm from the centroid line. Mark the correct answer and explain the reason for the choice.
A) Two sections of different shapes, but with the same moment of inertia have equal resistance to bending.
B) The profile with a higher height in relation to the centroid has a greater resistance module and, therefore, withstands less flexing efforts.
C) Profile A, due to its lower relative height, is more rigid at the bending moment.
D) The resistance to the rotation of a part depends exclusively on the moment of inertia of the plane surface of the
section.
E) The profile with a higher relative height has a greater flexion resistance when subjected to efforts.

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