Home 1 – Trails Edge Duplex
The Trails Edge Duplex provides two independent homes in one structure, as its name suggests. The structure has a 62 ft x 48 ft footprint for a foundation footprint of 2,976 square feet. The load calculation process was carried down through the three story duplex (basement included) from the roof to the foundation to determine the necessary strength of the slab. The final result was a slab superimposed dead load of 115 psf and a slab live load of 130 psf. A diagram of the loading calculation process for the Trails Edge Duplex, as well as the home floor plans, can be found in Figure D1 – D3. A table of the loading values is found in Table E1.
The loadings were then entered into the slab spreadsheet. The slab was manipulated until a cheap design was found that also satisfied all of the design checks. With these checks fulfilled, the spreadsheet produced a slab with 14 ft spans in each direction, with a thickness of 5.5 inches and 5 inch thick shear caps at each column line. A detailed diagram of the final slab design is shown in Figure F1. The slab was reinforced with both post tension and standard rebar. The specifics of the reinforcing design can be found in Figure F2.
For the Trails Edge Duplex, soil properties were based on the conditions found in Boring Pit # 1 (Shown in the geotechnical report). These properties were used as inputs in the pier design spreadsheet, which also took into account the loadings due to the slab. To achieve all the necessary checks, a typical pier was designed with a diameter of 1.75 ft and a length of 20 ft. Standard rebar reinforcing was also used to resist possible tension forces in the pier. This reinforcing can be found with the pier design diagram in Figure G1.
Figure D1. Upper Floor Trails Edge Duplex Loading
Figure D2: Main Floor Trails Edge Duplex
Figure D3. Basement Trails Edge Duplex Loading
Table E1. Trails Edge Duplex Loading
| Basement (sq ft) | Main Floor (sq ft) | Upper Floor (sq ft) | Dead Load (lbs) | Live Load
(lbs) |
|
| Floor Area | 2016 | 2976 | 2200 | 86304 | N/A |
| Garage Area | N/A | 960 | N/A | 14400 | 48000 |
| Wall Area | 960 | 2976 | 2200 | 99008 | N/A |
| Roof Area | N/A | 480 | 2200 | 40200 | 80400 |
| Living Area | 2016 | 2016 | 2200 | 93480 | 249280 |
| Sum | — | — | — | 333,392 | 377,680 |
Figure F1: Trails Edge Duplex Slab Design Output
Figure F2: Trails Edge Duplex Slab Reinforcing Design Output
Figure G1. Trails Edge Duplex Pier Design