Equilibrium

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Equilibrium
TUTORIAL 5
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Question 1a
what are the three equations of static
equilibrium?
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Question 1b
given that SH 0 is one of the equations
what does it mean?
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Question 1c
given that SV 0 is one of the equations
what does it mean?
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Question 1d
given that SM 0 is one of the equations
what does it mean?
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Question 2
given the post-and beam structure as shown,
describe three ways of stabilising it. Draw and
name the ways
what are they?
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Fantastic
next question
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Not happy !!
this says that a horizontal force equals 0, a
vertical force equals 0 and a moment o
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A devil of an answer !
you were kidding? No?
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that's grrr..eat !!
Yes, SH 0 means all that
the sum of the horizontal forces equals 0 the
sum of the forces acting to the left equals the
sum of the forces acting to the right The
structure does not move to the left or right
next question
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Think !
and then think again !
this says that all horizontal force are
zero (i.e. there are no horizontal forces)
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Partly right !
whats the full answer?
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Right on !
Yes, SV 0 means all that
the sum of the vertical forces equals 0 the sum
of the forces acting up equals the sum of the
forces acting down the structure does not move
up or down
next question
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Think !
and then think again !
this says that all vertical force are zero (i.e.
there are no vertical forces)
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Partly right !
whats the full answer?
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Yes! Yes! Yes !
Yes, SM 0 means all that
the sum of the moments equals 0 the sum of the
clockwise moments equals the sum of the
anti-clockwise moments the structure does not
rotate or spin
next question
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Think !
and then think again !
this says that all the moments are zero (i.e.
there are no moments)
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Partly right !
whats the full answer?
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If thats what you got then youve done it !

• a) cross-bracing

• b) knee-bracing

• c) rigid joints

• d) solid infill
• (shear panels)

• e) build-in posts
• (rigid joints)

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