A 1.40m x 1.80m footing is used to support a total factored load of 750 kN. The footing thickness is 325 mm and the column size is 300mm x 300mm. Use effective steel covering of 75mm, fc’ = 21MPa and fy = 276 MPa. (See Figure 6) A 1.40m x 1.80m footing is used to support a total factored load of 750 kN. The footing thickness is 325 mm and the column size is300mm x 300mm. Use effective steel covering of 75mm, fc' = 21MPa and fy = 276 MPa. (See Figure 6)a) Calculate the design beam shear (maximum factored shear force at distance "d" from face of column).b) Calculate the design punching shear (factored shear force at distance "d/2" from face of column).c) Is the thickness of the footing sufficient for shear requirements? Support your answer.d) Calculate the required area of steel in the long direction.e) Calculate the required area of steel in the short direction.|Pu = 750 kN0.325 m75 mm- Short direction steel0.30 m0.30 m-Long direction steel1.80 mFigure 6 Problem 61.40 m

a)design beam shear or maximum factored shear force att distance d from face of column d = D -…

A 1.40m x 1.80m footing is used to support a total factored load of 750 kN. The footing thickness is 325 mm and the column size is 300mm x 300mm. Use effective steel covering of 75mm, fc’ = 21MPa and fy = 276 MPa. (See Figure 6)

A 1.40m x 1.80m footing is used to support a total factored load of 750 kN. The footing thickness is 325 mm and the column size is 300mm x 300mm. Use effective steel covering of 75mm, fc’ = 21MPa and fy = 276 MPa. (See Figure 6)

Structural Analysis

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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.

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A 1.40m x 1.80m footing is used to support a total factored load of 750 kN. The footing thickness is 325 mm and the column size is
300mm x 300mm. Use effective steel covering of 75mm, fc' = 21MPa and fy = 276 MPa. (See Figure 6)
a) Calculate the design beam shear (maximum factored shear force at distance "d" from face of column).
b) Calculate the design punching shear (factored shear force at distance "d/2" from face of column).
c) Is the thickness of the footing sufficient for shear requirements? Support your answer.
d) Calculate the required area of steel in the long direction.
e) Calculate the required area of steel in the short direction.
|Pu = 750 kN
0.325 m
75 mm
- Short direction steel
0.30 m
0.30 m
-Long direction steel
1.80 m
Figure 6 Problem 6
1.40 m

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