Due: February 10, 2003 (in class)

Design tension ties to replace the existing 2x6 attic joists in the structure shown below. Materials for the ties can be steel, wood; or steel and wood combined. Spacing of the existing joists is 24" on center [o.c.]. The new ties can be spaced up to 6 feet apart (spacing is your choice).

Assume all new interior wall and ceiling finishes to be painted drywall. Existing flat ceiling and attic floor will be removed, revealing "cathedral" ceiling. Place windows or openings as desired.

Note that stresses in tie are extremely low compared to capacity of typical steel or wood sections. Assume that a minimum of 1.5 square inches of wood, or 0.04 square inches of steel, is adequate to carry load: but more cross-sectional area may be useful to "express" the idea of tension.

Requirements:

For 2/3/03 class: submit cross-sectional drawings showing overall form of ties; also, any other drawings to describe 3-D complexities (if any) not evident from sectional elevation.

For 2/10/03 class: submit final drawings (as above) and model with one gable-end removed. Suggested scale: 1/2"=1'-0".