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1. Loads applied must be resisted, and there must be no rotation

   • If we don't have equilibrium something is missing
     • The reaction must be equal and opposite
   • Tendency to rotate = moment
     • How to calculate rotational equilibrium
       • Moment = Force x Distance
       • Calculate them about a moment (use distance from a point)
       • Positive moment = counterclockwise
       • Negative moment = clockwise
     • Must be resisted
       • Can be resisted by the wall, beam, column, wall
     • Fixed vs. Free to rotate
       • Fixed = capacity to resist moment
         • If an end is fixed, you have a moment connection

2. Cantilever

   • What if you don't have a wall to support the cantilever?
     • Backspan
       • Cantilever should be less than 40% of the backspan
     • What if you don't have enough backspan?
       • Tension tie on back column
         • Creates a couple
   • The beam cannot fail, so the span to depth ratio needs to be 1:4