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2 cards from this section. Quick, good the night before a test.
What is a free body diagram?
Think about visualizing forces.
What does base excitation refer to?
Remember earthquakes and their effects.
What does the right-hand side of the equation mu¨(t) + cu˙(t) + ku(t) = -mu¨g(t) represent?
Think about forces that affect the mass due to ground shaking.
True or False: The mass's inertia is irrelevant in the analysis of structures under earthquakes.
Consider how an object behaves when moving.
Consider a system where a mass is subjected to ground motion. Analyze how modifying the stiffness of the system changes its response to seismic loads.
Think about the relationship between stiffness and response frequency.
Sketch a free body diagram for a mass experiencing both gravitational and inertial forces during ground motion. Indicate all forces acting on the mass.
Remember to draw arrows to signify the direction and magnitude of each force.
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