A square footing 2.5m x 2.5 m supports a square column 300mm x 300mm at its center. Concrete cover to bar centroid = 100mm. Ultimate load combination is 1.2DL + 1.6L. Column loads aee service conditions: DL= 680 KN LL = 400KN f'c = 20.7 Mpa fy=275 MPa

A square footing 2.5m x 2.5 m supports a square column 300mm x 300mm at its center. Concrete cover to bar centroid = 100mm. Ultimate load combination is 1.2DL + 1.6L. Column loads aee service conditions: DL= 680 KN LL = 400KN f'c = 20.7 Mpa fy=275 MPa

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

A square footing 2.5m x 2.5 m supports a square column
300mm x 300mm at its center. Concrete cover to bar centroid
= 100mm. Ultimate load combination is 1.2DL + 1.6L.
Column loads aee service conditions:
DL= 680 KN LL = 400KN
f'c = 20.7 Mpa fy = 275 MPa
Calculate the nominal punching-shear stress acting at the
critical section of the footing slab if the thickness of the slab is
450 mm.

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Step 2: Calculating Effective depth of footing :

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Step 3: Design punching shear strength for two way shear :

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Step 4: Representation of footing :

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