RCC Structures Design
If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment

WL/2
WL/6
WL/4
WL/8

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RCC Structures Design
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

42 diameters from the inner edge of the column
24 diameters from the centre of the column
42 diameters from the centre of the column
42 diameters from the outer edge of the column

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