Tension Form

Beam action - Vertical reactions only
Compression Form

Arch action
    Horizontal thrust plus vertical reaction
 

 
Internal tension opposes internal compression

Shear parallel to grain seldom governs except at supports and for heavily-loaded short spans. Do not load timber in tension perpendicular to grain.
All internal compression


    The less the rise, the greater the
    horizontal thrust.
 
 
Tension and compression and radial tension
    Internal Ties                  External Bracing
 




      Hannahville School Gym (1992)
      Wilson, MI
      Architect: Sundberg Carlson & Assocs.
      Contractor: Champion, Inc.
 

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