Transcript TUTORIAL 5 Equilibrium to answer just click on the button or image related to the answer.

TUTORIAL 5
Equilibrium
to answer just click on the button or image related to the answer
Question 1a
what are the three equations of static equilibrium?
a
H = 0, V = 0, M = 0
b
ΣH = 0, Σ V = 0, ΣM = 0
c
F = ma, M = Fd, P = F/A
Question 1b
given that ΣH = 0 is one of the equations
what does it mean?
a
all horizontal forces equal zero
b
the sum of all horizontal forces equals zero
c
the sum of the forces acting to the left equals
the sum of the forces acting to the right
d
the structure does not move to the left or right
e
b, c and d
Question 1c
given that ΣV = 0 is one of the equations
what does it mean?
a
all vertical forces equal zero
b
the sum of all vertical forces equals zero
c
the sum of the forces acting upwards equals
the sum of the forces acting downwards
d
the structure does not move up or down
e
b, c and d
Question 1d
given that ΣM = 0 is one of the equations
what does it mean?
a
all moments equal zero
b
the sum of all moments equals zero
c
the sum of the clockwise moments equals
the sum of the anti-clockwise moments
d
the structure does rotate / spin
e
b, c and d
Question 2
given the post-and beam structure
as shown, describe three ways of
stabilising it.
Draw and name the ways
what are they?
a
show me
next question
enough !
this says that a horizontal force equals 0,
a vertical force equals 0 and
a moment = o
let me try again
let me out of here
you were kidding? No?
let me try again
let me out of here
Yes, ΣH = 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
enough !
and then think again !
this says that all horizontal force are zero
(i.e. there are no horizontal forces)
let me try again
let me out of here
what’s the full answer?
let me try again
let me out of here
Yes, ΣV = 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
enough !
and then think again !
this says that all vertical force are zero
(i.e. there are no vertical forces)
let me try again
let me out of here
what’s the full answer?
let me try again
let me out of here
Yes, ΣM = 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
enough !
and then think again !
this says that all the moments are zero
(i.e. there are no moments)
let me try again
let me out of here
what’s the full answer?
let me try again
let me out of here
If that’s what you got then you’ve done it !

a) cross-bracing

b) knee-bracing

c) rigid joints

d) solid infill
(shear panels)

e) build-in posts
(rigid joints)