3. Compute the factor of safety against a bearing capacity failure for the 3 m square concrete footing shown below. The groundwater table is 2.5 m below the ground surface. Use Vesic's bearing capacity formula. [Course Objective #2] 3a. Intermediate calculation - enter the applied bearing pressure (q) in kPa. 3b. Intermediate calculation - enter the ultimate bearing capacity (quit) in kPa. 3c. Final calculation - enter the factor of safety. 2.5 m 0.75 m P = 6025 KN 3 m SW, y≈ 18 kN/m³ c' = 0 kPa $' = 36° SM, y≈ 18.5 kN/m³ c' = 3 kPa $' = 30°

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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### Problem Statement:

**Objective:**
Compute the factor of safety against a bearing capacity failure for the 3 m square concrete footing shown below. The groundwater table is 2.5 m below the ground surface. Use Vesic’s bearing capacity formula. [Course Objective #2]

**Calculations Required:**
- **3a.** Intermediate calculation - Enter the applied bearing pressure (\(q\)) in kPa.
- **3b.** Intermediate calculation - Enter the ultimate bearing capacity (\(q_{ult}\)) in kPa.
- **3c.** Final calculation - Enter the factor of safety.

### Diagram Explanation:

- **Structure:**
  - A footing with a width of 3 m supports a load (\(P\)) of 6025 kN.
  - The footing is embedded 0.75 m below the ground surface.

- **Ground Conditions:**
  - Above the groundwater table: Soil type (SW) with characteristics:
    - Unit weight (\(\gamma\)) ≈ 18 kN/m³
    - Cohesion (\(c'\)) = 0 kPa
    - Friction angle (\(\phi'\)) = 36°
  - Below the groundwater table: Soil type (SM) with characteristics:
    - Unit weight (\(\gamma\)) ≈ 18.5 kN/m³
    - Cohesion (\(c'\)) = 3 kPa
    - Friction angle (\(\phi'\)) = 30°

- **Groundwater Table:**
  - Positioned 2.5 m below the ground surface.

### Task Overview:

Calculate bearing pressures and safety factor using the given soil parameters and load information. Apply Vesic’s bearing capacity formula to determine the required values step-by-step.
Transcribed Image Text:### Problem Statement: **Objective:** Compute the factor of safety against a bearing capacity failure for the 3 m square concrete footing shown below. The groundwater table is 2.5 m below the ground surface. Use Vesic’s bearing capacity formula. [Course Objective #2] **Calculations Required:** - **3a.** Intermediate calculation - Enter the applied bearing pressure (\(q\)) in kPa. - **3b.** Intermediate calculation - Enter the ultimate bearing capacity (\(q_{ult}\)) in kPa. - **3c.** Final calculation - Enter the factor of safety. ### Diagram Explanation: - **Structure:** - A footing with a width of 3 m supports a load (\(P\)) of 6025 kN. - The footing is embedded 0.75 m below the ground surface. - **Ground Conditions:** - Above the groundwater table: Soil type (SW) with characteristics: - Unit weight (\(\gamma\)) ≈ 18 kN/m³ - Cohesion (\(c'\)) = 0 kPa - Friction angle (\(\phi'\)) = 36° - Below the groundwater table: Soil type (SM) with characteristics: - Unit weight (\(\gamma\)) ≈ 18.5 kN/m³ - Cohesion (\(c'\)) = 3 kPa - Friction angle (\(\phi'\)) = 30° - **Groundwater Table:** - Positioned 2.5 m below the ground surface. ### Task Overview: Calculate bearing pressures and safety factor using the given soil parameters and load information. Apply Vesic’s bearing capacity formula to determine the required values step-by-step.
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