Question 3 Determine the width of strip footing required to carry a uniform vertical load of 600 kN/m (2/3 Gk i.e., permanent and 1/3 Qk i.e., variable) in the situations listed below (undrained in a and b; drained in c and d). The groundwater level is well below the base of the footing in all cases, and the parameter values listed are characteristic values. Assume Yconc 25 kN/m³ and the foundation thickness equals the depth. a. Founding depth = 0.5m; cu b. Founding depth = 4.5m; c. Founding depth = 0.5m; d. Founding depth = 0.5m; 80 kPa; cu 80 kPa; c' = 0 kPa; c' = 5 kPa; = = ' = 30°; ' = 30°; y = 18 kN/m³ y = 18 kN/m³ y = 20 kN/m³ y = 20 kN/m³

Question 3 Determine the width of strip footing required to carry a uniform vertical load of 600 kN/m (2/3 Gk i.e., permanent and 1/3 Qk i.e., variable) in the situations listed below (undrained in a and b; drained in c and d). The groundwater level is well below the base of the footing in all cases, and the parameter values listed are characteristic values. Assume Yconc 25 kN/m³ and the foundation thickness equals the depth. a. Founding depth = 0.5m; cu b. Founding depth = 4.5m; c. Founding depth = 0.5m; d. Founding depth = 0.5m; 80 kPa; cu 80 kPa; c' = 0 kPa; c' = 5 kPa; = = ' = 30°; ' = 30°; y = 18 kN/m³ y = 18 kN/m³ y = 20 kN/m³ y = 20 kN/m³

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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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.

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