Stadium Design
This explains how a grandstand withstands crowd-incuced vibrations from synchronized jumping as the this crowd-structure interaction jumping up and down causes amplified oscilations in lightweight designs.
Using a seesaw analogy demosntrates load balancing and resonance avoidance
by having a load pulled down from extending the roof back behind the stands it pulls up the rest of the force that is applied down from the other end.
this structure is then extruded around a circular form to complete the stadium design
The physics principled applied here are dynamic loading and damping







