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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