Model reinforced isolated footings on an irregular column grid

Model a reinforced concrete isolated footing foundation on an irregular column grid, using the supplied dimensioned diagrams diagram_01.png, diagram_01_detail01.png, diagram_01_detail02.png, diagram_01_detail03.png and diagram_01_detail04.png. Work in imperial units (feet and inches).

Grid: create eight lettered grid lines A to H and seven numbered grid lines 1 to 7. The lettered grid spacings, left to right, are A–B 7'-9", B–C 1'-9", C–D 2'-3 1/2", D–E 3'-4 1/2", E–F 5'-8 1/2", F–G 5'-10 1/2" and G–H 2'-6" (29'-3" overall). The numbered grid spacings, bottom to top, are 1–2 15'-1 1/2", 2–3 17'-1 1/2", 3–4 7'-9", 4–5 7'-1 1/2", 5–6 9'-1 1/2" and 6–7 2'-6" (58'-9" overall).

Footings: place rectangular isolated concrete footings at the column locations shown in the diagrams.

• Corner and edge footings are offset so the grid intersection lies at or near a footing edge. Examples are A/7, A/5, H/6, A/1 and H/1.
• Interior footings are roughly centred on their grid intersection. Examples are B/5, D–E/4, D/3, G/3 and G/5.
• One elongated footing along grid A spans from grid 4 to grid 3.
• Further footings are shown at B–C/7, F/7, A/2, C–D/2, G–H/2 and E/1.

Reinforcement: reinforce every footing with a bottom rebar mat running in both directions across its full plan extent. Provide column dowel or stirrup reinforcement at each column position within the footing.

Dimensions and views: dimension both grid directions in the foundation plan with the string dimensions listed above. Place North, South, East and West elevation markers around the plan.