Details: The goal is to design a reinforced concrete floor system while dealing with the potentially conflicting criteria of (1) minimum weight of floor system, and (2) avoiding an excessive use of new columns to support the floor. The floor system structure is limited to the following elements: 1-way slabs, beams, and girders; all supported on new columns and/or the existing load-bearing masonry walls. Use the following "rules of thumb" to determine dimensions of columns, beams, girders, and slabs:

• Beams, girders, and slabs may frame directly into (be supported by) all perimeter walls.
• The thickness (total depth) of a 1-way slab = its clear span divided by 28, rounded up to the nearest 1/2". The minimum allowable slab thickness is two inches.
• The thickness (total depth) of a beam or girder = its clear span divided by 21, rounded up to the nearest even inch. Assume that the width of all beams and girders is 12". The minimum allowable beam-girder depth is six inches.
• The dimensions of all columns = 12" x 12" x 10', measured to the top of the slab.
• The thickness (depth) of beams and girders is measured to the top of the slab.

1. On first sheet (8-1/2" x 11" paper): schematic framing plan at 1/8" = 1'-0" showing columns, girders, beams, and direction of 1-way slabs. Label all slab types as S1, S2, etc.; label all beam types as B1, B2, etc.; and label all girder types as G1, G2, etc. For the purpose of this assignment, a "type" is defined by its clear span. Include graphic scale, north arrow, and dimension strings.
2. On second sheet (8-1/2" x 11" paper): 3-dimensional "cut-away" drawing (axonometric, isometic, or perspective) showing detail of intersection of beam, girder, slab, and column. Cut-away through all structural elements except column to show reinforcement. For beams and girders, you may assume 2-3 bars, top and bottom; for slabs, assume spacing of bars at approximately 6" on center. Slab reinforcement is placed 3/4" clear from the face of slab; while beam or girder reinforcement is placed 1-1/2" away.
3. On third sheet (8-1/2" x 11" paper): show in tabular form the volume of all slab, beam, girder, and column elements; indicate the total volume of concrete used. Units should be cubic feet (if calculating in cubic inches, divide final answer by 1728 to get cubic feet).

References:

• Text, chapter 14 (Sitecast concrete framing systems)
• See other references on course reserve.
• Rough sketch of a framing plan; Rough sketch of 3-D detail; Rough calculation sheet