Home 3 – Lennar Series Homes

The Lennar Series Homes plan provided shows a 72’ x 40’ plan with one floor and a basement. The home selected is a 3 bed/3 bath home with a two car garage slab.. Using the guidelines in the loading design overview, the overall loadings on the house were calculated. These results can be found in Appendices D and E. The dead load on the slab was found to be 72 psf and the live load on the slab was found to be 115 psf.

Using the excel sheet explained in the slab design overview, the floor plan found in Appendix F considers an appropriate layout for the slab. The slab was found to be 4.8 inches thick with 1.25’ x 1.25’ drop caps at each column.The slab is designed to use post tensioning cables per recommendations when using the Tella-Firma technology. After calculation, it is determined that 6 strands of PT cable per span safely supports the loadings on the slab. While the post-tension cables are adequately designed, rebar support is given at each pier to assist with negative moment reinforcement. For this, 8 #4 bars of 10 ft length are recommended at each pier.

The piers were designed in accordance with the pier design overview. The final minimum pier diameter is found to be . The pier is 25 ft below ground in order to get a 5-foot embedment length in the rock assuming bedrock is no deeper than 20 ft. The sheet requires 5.34 square inches of vertical reinforcement within the pier, therefore 6 – #9 bars were selected for each pier. A diagram of the pier design can be found in Appendix G.

Figure D6. Basement Lennar Series Homes Loading

Figure D7. Main Floor Lennar Series Homes Loading

Table E3. Lennar Series Loading

Figure F4. Slab Design for Lennar Series Homes

Figure G3. Lennar Series Homes Pier Design

Links to the Design of Each Home Type

Home 1 – Trails Edge Duplex

Home 2 – Meritage Homes

Home 3 – Lennar Series Homes

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