Depth (m) 0-2.2 2.2-6.1 6.1-11.5 11.5-30.0 Soil classification Stiff clayed silt (CL) Stiff silty clay (CL) Very stiff sandy clay (CL) Very stiff sandy clay (CL) Undrained shear strength su 70 85 120 180 The groundwater table is at a depth of 50 m. No onsite static load test data is ava the soil conditions are uniform, and the site characterization program was average factor of safety for the drilled shaft is 3.0. Compute the allowable downward capac each shaft.

Depth (m) 0-2.2 2.2-6.1 6.1-11.5 11.5-30.0 Soil classification Stiff clayed silt (CL) Stiff silty clay (CL) Very stiff sandy clay (CL) Very stiff sandy clay (CL) Undrained shear strength su 70 85 120 180 The groundwater table is at a depth of 50 m. No onsite static load test data is ava the soil conditions are uniform, and the site characterization program was average factor of safety for the drilled shaft is 3.0. Compute the allowable downward capac each shaft.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

Transcribed Image Text:An office building is to be supported on a series of 700-mm diameter, 12.0-m long drilled shafts that will be built using the open hole method. The soil profile at this site is as follows:

### Soil and Foundation Information

**Soil Data Table:**

| Depth (m) | Soil Classification | Undrained Shear Strength \( s_u \) (kPa) |
|-----------|------------------------|------------------------------------------|
| 0-2.2 | Stiff clayed silt (CL) | 70 |
| 2.2-6.1 | Stiff silty clay (CL) | 85 |
| 6.1-11.5 | Very stiff sandy clay (CL) | 120 |
| 11.5-30.0 | Very stiff sandy clay (CL) | 180 |

**Additional Information:**
- The groundwater table is at a depth of 50 m.
- No onsite static load test data is available.
- The soil conditions are uniform and the site characterization program was considered average.
- The factor of safety for the drilled shaft is 3.0.

**Task:**
- Compute the allowable downward capacity of each shaft.

This table provides essential data for evaluating soil conditions and determining the support capacity needed for construction. The undrained shear strength values are critical for understanding the load-bearing capacity of different soil layers.

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