Applied Physics I: Chapter 3: Properties of Matter - Thermal Physics
Expansion Joints
Thermal Physics
Expansion joints are provided while laying the railway lines.
EXPANSION
JOINTS
We
know, the Young's Modulus E: Longitudinal stress / Longitudinal strain ...... (1)
Here
Longitudinal stress = Force / Area
=
F/ A ……….(2)
We
know Longitudinal strain dl/l = αθ …………….(3)
∴ Substituting equations
(2) & (3) in equation (1) we get
E = (F/A) / (αθ)
(or) F/A = Eαθ
(or) F = E αθ A ........ (4)
From
equation (4) we can see that if the Area is less then the force required to
restore the material to its original position is less. Suppose, if the area is
large then the restoring force should also be more, which is quite impossible.
Hence, to avoid this problem, while constructing a large area of beams, gaps
are provided & these gaps are called expansion joints.
Examples:
(i) Expansion joints are provided while laying
the railway lines.
(ii) Expansion joints are provided even in the
construction of buildings. However the joints area well packed and are not
visible.
Applied Physics I: Chapter 3: Properties of Matter - Thermal Physics : Tag: Applied Physics : Thermal Physics - Expansion Joints
Applied Physics I: Chapter 3: Properties of Matter - Thermal Physics
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