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Agenda: Vector Active – Trusses Form Active – Cables, Arches Bulk Active -- Beams Internal Forces + Stresses Method of Cuts --- On Chalkboard. Vector Active Structures: Utilize triangulation coupled with tension and compression to resist loads.
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Agenda: Vector Active – Trusses Form Active – Cables, Arches Bulk Active -- Beams Internal Forces + Stresses Method of Cuts --- On Chalkboard
Vector Active Structures: Utilize triangulation coupled with tension and compression to resist loads. The “depth” of a VAS is directly related to its ability to span a given distance. Deeper translates to lower forces and longer spans.
Form Active Structures: Utilize their geometric shape / form to resist loads. The “effective depth” of a FAS is directly related to its ability to span a given distance. Deeper translates to lower forces and longer spans.
+ SM = 0 Rotational Equilibrium +
Vertical Equilibrium SFy = 0 +
Vertical Equilibrium SFy = 0
Vertical Equilibrium SFy = 0 shear deformation + SHEAR SHEAR STRESS
SM = 0 Rotational Equilibrium bending deformation + C T BENDING STRESS (tens/comp) Force Couple Bending Moment Force x lever arm
fibers shorten f i b e r s e l o n g a t e neutral axis, no change in length link to beam bending animation
Shear Diagram Shear Stresses Flexural Stresses Moment Diagram link to diagram animation
depth Bulk Active Structures: A beam’s ability to span is based upon the amount of bulk (material) it has and exactly how this material is distributed relative to its cross-section. BEAM DEPTH IS CRITICAL