Connection types
Moments
Distributed loads
100
What kind of connection is this?
Roller
100
What are the units of a moment?
N*m, Lb*ft, Kips*in..... etc
2x Bonus: What fundamental units do all of these have in common?
100
What is the equation to calculate a centroid? You may consult you notes.
200
True or false: the structures we will see in the scope of this class will typically have two pinned connections
False! Most examples in this class will have a roller and pin or a fixed connection.
2x Bonus: explain why two pinned connections are problematic for the equations we have at our disposal.
200
What is the line of action?
An imaginary line that extends in both directions from a vector.
2x Bonus: Why is this important to the concept of moments?
200
A centroid is analogous to...
The center of mass of an object
2x bonus: why is this in the distributed load section?
300
A pinned connection is defined by...
resisting forces in the x, y, (and sometimes z) direction without resisting moments
300
What is a lever arm?
The distance from the point of rotation to force.
300
If a shape is symmetrical, what can you say about the location of the centroid without any additional information?
The centroid will exist on the line of symmetry
400
A rocker connection is analogous to what kind of connection?
A roller! Both supply one reaction.
400
Imagine you have a pivot point at x=0 along a pole. There is a force applied upwards at x=-10 with a magnitude of 2 newtons. You may place an upward force at x=5. What should the magnitude of this force be to create equilibrium?
4 Newtons
400
Where would I place a point load to model this distributed load?
x=6m
2x Bonus: Calculate the magnitude of that point load given that the load is 6N/m at B and 0N/m at A
500
What kind of connection is shown at A? What reactions do you need to calculate for it?
A fixed connection! It has reactions in the x, y, and z directions as well as moments in all directions.
500
M=F*D and M=F*d*Cos(Theta)
How are these two equations related?
The first equation implies that the force is acting at a 0-degree angle
500
If q is in units of N/m and L is in m. What is the location and magnitude of the analogous point load?
Mag:ql
location: q/2