You are managing a project where the soil bearing capacity test shows 2,000 psf, but your structural engineer specified footings designed for 2,500 psf bearing capacity. What should you do?
Correct Answer
B) Increase the footing size to reduce bearing pressure
When actual soil bearing capacity is less than design assumptions, the footing area must be increased to reduce the bearing pressure to acceptable levels. This ensures structural safety and prevents settlement issues.
Why This Is the Correct Answer
When the actual soil bearing capacity (2,000 psf) is less than the design assumption (2,500 psf), the footing must be enlarged to distribute the load over a greater area, thereby reducing the bearing pressure. This is the fundamental principle of bearing pressure = load ÷ area. Increasing the footing size is the most direct and effective solution to ensure the actual bearing pressure does not exceed the soil's capacity, preventing foundation failure and excessive settlement.
Why the Other Options Are Wrong
Option A: Proceed with construction as the difference is minimal
Proceeding with construction when soil capacity is 20% less than design assumptions is not minimal and creates serious safety risks. This could lead to foundation failure, excessive settlement, and structural damage.
Option C: Excavate deeper to find better soil
Excavating deeper may not guarantee finding better soil and could be costly and time-consuming. Additionally, deeper excavation might encounter groundwater or require different foundation systems entirely.
Option D: Add more reinforcement to the footings
Adding reinforcement to footings does not address the soil bearing capacity issue. Reinforcement helps the concrete handle internal stresses but cannot reduce the pressure transmitted to the soil below.
Memory Technique
Think 'BEAR the PRESSURE': When soil can't BEAR the load, reduce PRESSURE by increasing area (bigger footings)
Reference Hint
Florida Building Code, Chapter 18 - Soils and Foundations, or ACI 318 for concrete foundation design requirements
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