Trusses MOS (Method of Sections)
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world w
Trusses MOJ (Method of Joints)
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world wit
Determining Reaction Forces
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world with r
Procedure for finding Moments of Inertia for composite shapes
1. Break composite shape up into simple shapes.
2. Calculate the area of each simple shape.
3. Calculate I x ' and I y' for each simple shape.
4. Determine what will be the x-axis and y-axis ab
Internal Forces
1. Draw a Free Body Diagram (FBD)
a. Draw your reference frame; axes and indication of the direction for a positive moment.
b. Ignore the internal structure.
c. Replace all of the points of contact with the outside world with reaction forc
Procedure for finding centroids for Integrated areas.
1. Select a horizontal or vertical strip for integration. (unless you want to use double integrals
then you are on your own.)
2. Define dA for the selected strip.
3. Find ~ for the selected strip.
x
y
Procedure for finding centroids for composite shapes (made up of several simple shapes)
1.
2.
3.
4.
5.
Identify axes x-, and y- axes)
Break object up into simple shapes.
Calculate the area of each simple shape.
Determine whether each shape has a positive