Question

1. which conditions of bending are present in the beams below?

(a)
simple
(b)
contilever
(c)
overhanging
(d)
continuous
(e)
restrained
a) positive bending
b) negative bendin
c) positive and negative
d)
e)

Explanation:

• For a simple beam, the bending moment causes the beam to sag, which is positive bending.
• For a cantilever beam, the bending moment causes the beam to hog, which is negative bending.
• For an overhanging beam, there is a region of positive bending (sagging) and a region of negative bending (hogging).
• For a continuous beam, there are regions of positive bending (sagging) and negative bending (hogging) depending on the loading and support conditions.
• For a restrained beam (fixed - fixed beam), there are regions of negative bending at the supports (hogging) and positive bending in the middle (sagging).

Answer:

d) positive and negative
e) positive and negative