What is Eccentric Footing, Eccentric Footing, What is Concentric footing #footingwork #construction

What is Eccentric Footing, Eccentric Footing, What is Concentric footing #footingwork #construction

What is Eccentric Footing?
In some instances, columns lie eccentric to the center of the footing. Footings that are not concentrically loaded are known as “Eccentric Footings”. In addition, when footings are subjected to an axial load “P” and bending moment “M” or lateral force “H”, the footing will experience unbalanced stress distributions along the base of the footing. This can also be achieved with an axial load acting at an eccentricity “e” from the centroid of the footing.

As a result, the total combined stress at the base of the footing is equal to the sum of the stress due to the axial load over footing area (P/A) and the bending moment over section modulus “S” of footing (M/S).

Types of Footing
Footings are of two types concentric and eccentric based on the alignment of the centre of gravity (CG) of the column and its respective footing. The Centre of gravity is the point where the mass of the body is concentrated.

What is Concentric footing – a footing is called concentric when the centre of gravity (CG) of the column is in alignment with the centre of gravity (CG) of the footing. Hence, the load coming from the column is distributed uniformly downward to the soil. This generates uniform upward pressure below the footing by the soil. The foundation provided here is concentric foundation. (When the load is applied upon an area, pressure is generated and here upward pressure is generated by the soil below footing).
What is Eccentric footing – a footing is called eccentric when the centre of gravity (CG) of the column is NOT in alignment with the centre of gravity (CG) of the footing and the load from the column is not transferred uniformly to the soil. The foundation provided here is called eccentric foundation. Due to this, linear upward pressure is generated by the soil below. This can happen in two cases. The two cases have been given by N C Sinha and S K Roy (1991) (Authors of “Fundamentals of Reinforced Concrete”).

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१. बंगलो कन्स्ट्रक्शन
२. कमर्शियल कन्स्ट्रक्शन
३. इंडस्ट्रीयल कन्स्ट्रक्शन
४. ऑफिस स्पेस आणि आय. टी. पार्क्स कन्स्ट्रक्शन
५. हॉस्पिटल अँड हेल्थकेअर कन्स्ट्रक्शन
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