We have started a new topic in our previous post i.e.
engineering mechanics. We have seen there the basics of engineering
mechanics such as concept
of force system, principle
of transmissibility of forces and its limitations, classification
of force system, body
force and surface force, moment
of a force, Varignon’s theorem, concept of a couple,
resultant of a force system acting on a body and how to draw the Free body diagram with the help of our recent posts.Â
Now, we will be interested here to understand reactions
at support and connection in engineering mechanics with the help of this
post.Â
Reactions at support and connection in engineering mechanicsÂ
This topic i.e. reactions at support and connection in
engineering mechanics for solving any kind of mechanics problems involving the
different types of forces.Â
We will understand here the different types of supports,
connections and their reactions here with the help of this post.Â
So, let us start now without wasting your time.Â
In structural arrangements, support is basically
defined as a member that helps other members to resist the loads.Â
Support condition that restrain translation in one directionÂ
Support condition that restrain translation in one
direction, what we will understand after reading this?Â
Its means, support condition that does not permit the
motion in one direction. Â Â
Roller support, friction-less surfaces, rockers and wall
edges are the best example for support condition that restrain translation in
one direction.Â
There will be only one unknown term and that will be
the magnitude of the reaction force normal to the contact surface. We will have
information here the direction of this reaction force but we will have to find
out here the magnitude of this reaction force in such type of support
conditions.Â
Let us see here few examples for supports that
restrain translation in one direction with the help of following figure. Â
Support condition that restrain translation but permit the rotationÂ
Support condition that restrain translation but permit
the rotation, what we will understand after reading this?Â
Its means, support condition that does not permit the translation
motion but it permits the rotation. Translation or linear movement will be
restricted here at such types of supports.Â
Hinges support, rough surfaces, frictionless thin
bearings and frictionless pin connections are the best example for support
condition that restrain translation in one direction but permit the rotation.Â
Let us think the case of a door which will be supported
with the help of hinges. If we think it, we will be able to say that only
rotational motion will be possible and there will not be any possibility for
the translation or linear motion.Â
There will be two unknown terms and that will be the
magnitude and the direction of the reaction force at support.Â
As we will not have any information about the magnitude
and the direction of the reaction force at support, we will write the reaction
forces for such types of supports as Rx and Ry. We will
have to find out here the magnitude as well as the direction of the reaction
force in such type of support conditions.Â
Let us see here few examples for supports that
restrain translation in one direction but permit the rotational motion with the
help of following figure.Â
Hinge support
Support condition that restrain translation and rotational motionÂ
Support condition that restrain translation as well as
rotational motion, what we will understand after reading this?Â
Its means, support condition that does not permit the translation
motion and rotational motion.Â
Translation or linear movement and rotational motion will be restricted here at such types of supports. Â
Translation or linear movement and rotational motion will be restricted here at such types of supports. Â
Fixed supports such as simply supported beams, welded
ends and two closely spaced pin joints are the best examples for support
condition that restrain translation and rotation both.Â
There will be three unknown terms and that will be the
magnitude and the direction of the reaction force at support and the moment.Â
As we will not have any information about the magnitude
and the direction of the reaction force at support, we will write the reaction
forces for such types of supports as Rx (horizontal reaction force, F) and Ry (vertical reaction force, V). We will
have to find out here the magnitude as well as the direction of the reaction
force and moment too in such type of support conditions.Â
Let us see here few examples for supports that does not permit the translation motion and rotational motion with the
help of following figure. Â
Therefore, we have seen here the meaning of supports,
various types of supports and connections and their reactions and finally we
have also looked here the practical examples of different types of supports in
various engineering equipment with the help of this post. Â
Do you have any suggestions? Please write in
comment box and also drop your email id in the given mail box which is given at
right hand side of page for further and continuous update from www.hkdivedi.com. Â
Further we will find out, in our next
post, concept of force system and Trusses in engineering mechanics. Â
Reference:Â Â
Engineering Mechanics, By Prof K. RameshÂ
Image courtesy: Google Â
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