Question

You have a client who is building a new warehouse in the Connecticut River Valley, north of Springfield. The warehouse will be a rectangular building, with a footprint of approximately 25,000 square feet. The dimensions of the new building will be 250 feet by 100 feet. The design calls for adding five feet of fill to raise the building pad above the existing ground surface. The floor loads in the warehouse will be relatively heavy. Settlement will be a significant concern for the project. To prepare to estimate settlement, it is first necessary to calculate the stress increase due to the weight of the building, the floor loads and the weight of fill placed to raise the site. Today's assignment will be to calculate the stress increase at depths of 20, 35 and 55 feet below ground surface, under the corner of the building due to An 8 foot square spread footing bearing at the existing ground surface. The footing will carry a 192K column load. The weight of five feet of fill placed to form the building pad. The fill will consist of sand and gravel, compacted at a moist unit weight of 140 lbs/ft? The 1,000 lb/ft floor load acting over the entire footprint of the building. Assume that all loads act at the existing ground surface. . . Add the three load increases together to determine the total stress increase at each depth interval

Answer 1

To calculate the stress increase at depths of 20, 35, and 55 feet below the ground surface, under the corner of the building, you need to consider the load increases due to an 8-foot square spread footing bearing at the existing ground surface, a 192K column load, the weight of five feet of fill placed to form the building pad, and a 1,000 lb/ft² floor load acting over the entire footprint of the building. Add the three load increases together to determine the total stress increase at each depth interval.

Step-by-step explanation:

To calculate the stress increase at depths of 20, 35, and 55 feet below the ground surface, under the corner of the building, we need to consider the load increases due to the following factors:

1. An 8-foot square spread footing bearing at the existing ground surface, carrying a 192K column load.
2. The weight of five feet of fill placed to form the building pad, consisting of sand and gravel compacted at a moist unit weight of 140 lbs/ft³.
3. A 1,000 lb/ft² floor load acting over the entire footprint of the building.

First, let's calculate the stress increase at each depth interval:

• At 20 feet below the ground surface:
• Stress increase due to the footing: Calculate the stress increase caused by the 192K column load on the 8-foot square spread footing.
• Stress increase due to the fill: Calculate the stress increase caused by the weight of five feet of fill placed to form the building pad.
• Stress increase due to the floor load: Calculate the stress increase caused by the 1,000 lb/ft² floor load acting over the entire footprint of the building.
• At 35 feet below the ground surface:
• Repeat the same calculations for the stress increase at this depth interval.
• At 55 feet below the ground surface:
• Repeat the same calculations for the stress increase at this depth interval.

Finally, add the three load increases together to determine the total stress increase at each depth interval.