Design of Reinforced Concrete Elements

You have been contacted by the ABC School District to design a modular unit that can be divided in two or more classrooms as needed. A plan view of the modular units is shown below. Each unit will have a five feet overhang on both sides of the longest dimension. The system will consist of a continuous roof slab running in the longitudinal direction over frames spaced as indicated in the Table below. These frames will be the main elements to transfer vertical loads to the foundation. They will also transfer the transverse lateral loads. Longitudinal lateral loads will be carry by shear walls (not to be designed). Columns can only be located along the perimeter. All main structural members (slab, beams, columns and footings) must be of reinforced concrete. ACI 318-05 building code requirements must be satisfied. The floor slab is going to be 4-inch thick. The bearing capacity of the soil has been estimated to be 4000 psf. The top of the footing is 3 ft below the bottom of the floor slab. Wind loads are as specified in the Table below.The water table is very deep. Only Gr.60 steel is available. Assume a unit weight of soil equal to 120 pcf.

Each student will submit a report. The report should be as follows:

Include course name, course number, student name, student ID, date, etc.

Describe the structural system, the methods of analysis, and codes used for design.

Show final layout and dimensions. Drawings do not need to be a scale, but they should be neat.

List the strength and properties of the materials selected. Not all members may need the same quality and strength of concrete.

Describe how do you think the supports are going to be built.

List all loads considered (i.e., dead loads, live loads, lateral loads, thermal loads, construction loads, etc.)

For each different member show dimensions, steel sizes and placement, and cover requirements.

Summarize the amount of concrete in cubic yards and the amount of reinforcent in tons. Do the summary by elements (i.e., slab, beams, columns, and footings) and then the totals per planter. If the strengths are diffferent keep quantities separate by material type.

Estimate the total cost of concrete and reinforcing steel.

Show the structural analysis of the different structural members. Show shear and bending diagram envelopes. Label each diagram so it is easy to identify which loading condition produced the critical shears and moments.

Show all design calculations (strength and serviceability). Indicate controlling ACI section as necessary.

The report should be neat and clearly organized. Make sure that the analysis and design have enough information so they can be followed by someone that has not worked in your project.

5 ft B ft 5 ft 120 ft

• June 11: Structural configuration (including preliminary sizes), construction sequence, material

types and loading.

• June 18: Shear and bending moment diagram envelopes for slab, and frames.
• June 25: Design of slab, and beams,
• June 28: Design Columns.
• July 2: Design of footings and final drawings.
• July 5: Summarize quantities, calculate cost and submit final report (reports will not be returned). (No later than 5 p.m.)