a) A 2 mx 2 m square footing is subjected to an axial load of 600 kN and a bending moment of 180 kNm as appears in Figure 2. The footing is located at 1.2 m deep in a cohesionless soil that has a friction angle of 35° and a saturated unit weight of 18.4 kN/m³. The water table is 2.7 m below the soil surface. Calculate the following, (i) Calculate the eccentricity of the load, (ii) Calculate and draw the soil contact pressure beneath the footing, (iii) Determine the factor of safety of the footing against the bearing capacity (use the general Meyerhof, bearing capacity equation). Assume the soil above water table is saturated. = 600 kN at 18.4 kN/m³ 1.2 m c'= 0 kPa, '= 35° 1.5 m DI. 2m M = 180 kNm Figure 2

a) A 2 mx 2 m square footing is subjected to an axial load of 600 kN and a bending moment of 180 kNm as appears in Figure 2. The footing is located at 1.2 m deep in a cohesionless soil that has a friction angle of 35° and a saturated unit weight of 18.4 kN/m³. The water table is 2.7 m below the soil surface. Calculate the following, (i) Calculate the eccentricity of the load, (ii) Calculate and draw the soil contact pressure beneath the footing, (iii) Determine the factor of safety of the footing against the bearing capacity (use the general Meyerhof, bearing capacity equation). Assume the soil above water table is saturated. = 600 kN at 18.4 kN/m³ 1.2 m c'= 0 kPa, '= 35° 1.5 m DI. 2m M = 180 kNm Figure 2

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

Q2.
a) A 2 mx 2 m square footing is subjected to an axial load of 600 kN and a bending moment of 180
kNm as appears in Figure 2. The footing is located at 1.2 m deep in a cohesionless soil that has a
friction angle of 35° and a saturated unit weight of 18.4 kN/m³. The water table is 2.7 m below the
soil surface. Calculate the following,
(i) Calculate the eccentricity of the load,
(ii) Calculate and draw the soil contact pressure beneath the footing,
(iii) Determine the factor of safety of the footing against the bearing capacity (use the general
Meyerhof, bearing capacity equation).
Assume the soil above water table is saturated.
-600 KN
/sat = 18.4 kN/m³
1.2 m
c'= 0 kPa, o'= 35°
1.5 m
DI.
2 m
M = 180 kNm
Figure 2

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