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Chapter six Chapter six
Laith Batarseh Laith Batarseh
Bending Bending
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Bending Bending
6.1. shear and moment diagrams 6.1. shear and moment diagrams
Shear and moment diagrams are important to study the bending
stresses.
To construct shear moment diagram, follow these procedures
Find the supports reactions using F.B.D and static equilibrium equations
Derive both shear and moment functions with respect to x or y axis by analyzing sections through the body
Draw shear and moment diagrams from the equations you found in the previous step
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Bending Bending
6.1. shear and moment diagrams 6.1. shear and moment diagrams
The sign conventions are opposite when the summing processes are carried out with opposite direction.
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Bending Bending
6.2. graphical method 6.2. graphical method
Regions of distributed load:
dxxwV
dxxVM
Change in moment = area under shear diagram
Change in shear = area under distributed loading
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Bending Bending
6.2. graphical method 6.2. graphical method
FV
VVFV
0
0
0
0
MM
MxVMMM
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Bending Bending
6.3. bending deformation 6.3. bending deformation
Assumptions: 1. Plane section remains plane
2. Length of longitudinal axis remains unchanged
3. Plane section remains perpendicular to the longitudinal axis
4. In-plane distortion of section is negligible
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Bending Bending
6.3. bending deformation 6.3. bending deformation
I
My
I
Mc
I
My
dAyc
M
dAc
yydAyydFM
MM
A
AA
ZZR
max
2max
max
;
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