Compute
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Compute the Reactions, Draw the detailed and accurate Shear Force and Bending Moment Diagram indicating and specifying values at all change of loading positions and at points of zero shear. Also, Calculate the area under parabola in shear force diagram. Indicate proper units, All answers must be in 3 decimal places.
Given:
P4 = 20 kips
P3 = 15 kips
P2 = P5 = 25 kips
P1 = 50 kips
M1 = 250 kip-ft
M2 = 825 kip-ft
M3 = 100 kip-ft
M4 = 1000 kip-ft
M5 = 500 kip-ft
![If the shear-force diagram is positive and looks like this ...
VE
VD
Linear
Linear
(first order)
(first order)
Constant
(zero order)
VB
VF
Vc.
then the bending-moment diagram looks like this:
..
MF
MB
MD
Quadratic
(second order)
Linear
(first order)
Quadratic
(second order)
ME
Mc
MA
Slope becomes
more positive
Slope becomes
less positive
Constant slope
(an arch)
(a hill that
gets steeper)
(an upward ramp)
V.
F
Vc
VA
VB
Linear
Constant
Linear
(zero order)
(first order)
(first order)
VD
... then the bending-moment diagram looks like this:
ME
Mc
Quadratic
(second order)
MA
Quadratic
(second order)
MD
Linear
(first order)
MB
Slope becomes
more negative
Slope becomes
less negative
Constant slope
(a valley)
(a waterfall)
|(a downward ramp)
Shear-Force Diagram V
Bending-Moment Diagram M
Load Diagram w
Equation
Rule 1: Concentrated loads create discontinuities in the shear-force diagram. [Equation (7.5)]
Slope = VB
%3D
Positive jump
in shear force V
MB
Slope = VA
MB
MA
VB
Po
AV = Po
V
MA
XA
XB
XB
XA
XB
XA
Rule 2: The change in shear force is equal to the area under the distributed-load curve. [Equation (7.3)]
AV= V½ – V¼ = J",
w(x) dx
w(x) dx
MB
w(x)
XA
XA
M
MB
B
M
Δν
Vg - VA = [" w(x) dx
XA
XB
XA
XB
XB
XA
Rule 3: The slope of the V diagram is equal to the intensity of the distributed load w. [Equation (7.1)]
WB
Slope = WB
MB
WB
Slope = w
"A
M
MB
MA
dV
= w(x)
dx
XA
XB
XB
XA
XB
Rule 4: The change in bending moment is equal to the area under the shear-force diagram. [Equation (7.4)]
AM=M;-M= | "V(x) dx
V(x) dx
XA
XA
VA
MB
AM
MB - MA = |" V dx
M
XA
XA
B VB
XB
XA
XB
XA
Rule 5: The slope of the M diagram is equal to the intensity of the shear force V. [Equation (7.2)]
Slope = V
Slope =w
-Slope = VA
MB
MB
%3D
dM
= V
dx
XB
XA
XB
XA
XB
Rule 6: Concentrated moments create discontinuities in the bending-moment diagram. [Equation (7.6)]
Negative jump in
No effect on
shear force V
bending moment
M
MB
VB
MA
AM = -Mo
XB
Mo
XB
XA
XB
A
XA](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F446ab0cf-4f2d-4109-be70-3632d14fef78%2F8c416422-39c5-404e-859e-574097fa0fbe%2F1qfxk7u_processed.jpeg&w=3840&q=75)
Transcribed Image Text:If the shear-force diagram is positive and looks like this ...
VE
VD
Linear
Linear
(first order)
(first order)
Constant
(zero order)
VB
VF
Vc.
then the bending-moment diagram looks like this:
..
MF
MB
MD
Quadratic
(second order)
Linear
(first order)
Quadratic
(second order)
ME
Mc
MA
Slope becomes
more positive
Slope becomes
less positive
Constant slope
(an arch)
(a hill that
gets steeper)
(an upward ramp)
V.
F
Vc
VA
VB
Linear
Constant
Linear
(zero order)
(first order)
(first order)
VD
... then the bending-moment diagram looks like this:
ME
Mc
Quadratic
(second order)
MA
Quadratic
(second order)
MD
Linear
(first order)
MB
Slope becomes
more negative
Slope becomes
less negative
Constant slope
(a valley)
(a waterfall)
|(a downward ramp)
Shear-Force Diagram V
Bending-Moment Diagram M
Load Diagram w
Equation
Rule 1: Concentrated loads create discontinuities in the shear-force diagram. [Equation (7.5)]
Slope = VB
%3D
Positive jump
in shear force V
MB
Slope = VA
MB
MA
VB
Po
AV = Po
V
MA
XA
XB
XB
XA
XB
XA
Rule 2: The change in shear force is equal to the area under the distributed-load curve. [Equation (7.3)]
AV= V½ – V¼ = J",
w(x) dx
w(x) dx
MB
w(x)
XA
XA
M
MB
B
M
Δν
Vg - VA = [" w(x) dx
XA
XB
XA
XB
XB
XA
Rule 3: The slope of the V diagram is equal to the intensity of the distributed load w. [Equation (7.1)]
WB
Slope = WB
MB
WB
Slope = w
"A
M
MB
MA
dV
= w(x)
dx
XA
XB
XB
XA
XB
Rule 4: The change in bending moment is equal to the area under the shear-force diagram. [Equation (7.4)]
AM=M;-M= | "V(x) dx
V(x) dx
XA
XA
VA
MB
AM
MB - MA = |" V dx
M
XA
XA
B VB
XB
XA
XB
XA
Rule 5: The slope of the M diagram is equal to the intensity of the shear force V. [Equation (7.2)]
Slope = V
Slope =w
-Slope = VA
MB
MB
%3D
dM
= V
dx
XB
XA
XB
XA
XB
Rule 6: Concentrated moments create discontinuities in the bending-moment diagram. [Equation (7.6)]
Negative jump in
No effect on
shear force V
bending moment
M
MB
VB
MA
AM = -Mo
XB
Mo
XB
XA
XB
A
XA
Transcribed Image Text:P5
P4
P3
P2
P1
M1
M2
M3
M4
M5
5 ft x 10 = 50 ft
%3D
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