Deduction of openings in brick masonry for Arch Construction (Communities - News & Events)

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Deduction of openings in brick masonry for Arch Construction


The following types of deduction should be provided in arch construction :-

Rectangular Openings
Segmental Arch Openings
Semi-circular arch opening
Masonry of arch
Lintel over opening

Rectangular Openings :-

For rectangular opening, full deduction should be provided.

Deduction = Length x Height x Thickness of wall = L x H x Thickness of wall

Segmental Arch Openings

If there exist a segmental arch opening over the rectangular opening, deduction in masonry should be provided for both the rectangular opening & the segmental arch opening.

Area of rectangular section = Length x Height = L x H

Area of segmental section = 2/3L x R + R3/2L

So, the total deduction should be as follow :-

[L x H + 2/3L x R] x thickness of wall

Semi Circular Arch Opening

Area of semi-circular section = πR2/2

But the approximate area of the semi-circular section = 3/4 L x R

So, the total deduction = [L x H + 3/4 L x R] x thickness of wall.

Masonry Of Arch

The quantity of masonry in arch is calculated in cubic metre as a individual item.

The quantity of arch masonry is subtracted from the total masonry.

Masonry of arch = Centre length of arch x breadth of the arch x thickness of arch

So, the deduction for arch in masonry = Lm x b x t

Masonry Of Arch

The quantity of masonry in arch is calculated in cubic metre as a individual item.

The quantity of arch masonry is subtracted from the total masonry.

Masonry of arch = Centre length of arch x breadth of the arch x thickness of arch

So, the deduction for arch in masonry = Lm x b x t

Lintel over opening

An RCC lintel is arranged over the door/window opening.

The quantity of RCC in lintel is subtracted from the masonry work.

A bearing of 10 to 15cm from the edge of opening is arranged to the lintel on either end of the opening.

So, the length of lintel will be as follow :-

Length of lintel (L) = Span of opening + 2 x bearing deduction for lintel = L x width of wall x thickness of lintel.


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Target State: All States
Target City : All Cities
Last Update : 10 June 2019
Number of Views: 40
Item  Owner  : Rajib Dey
Contact Email:
Contact Phone: 7980106705

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