Fallen Arches Kirkby-in-Furness

Some residential designers and builders in Kirkby-in-Furness have failed to recognize that all brick arches are structural masonry and must be designed according to structural principals.

South Lakeland Bricklayers LTD
01229 889921
Dunnerdale,Sandside
Cumbria
 
Chris Hull Construction Ltd
01229 716821
Orchard Barn
Broughton in Furness
 
D Farrer
01229 588337
Smithy House
Ulverston
 
Hindle Plant Hire
01229 462840
The Old Chapel
Ulverston
 
Paver Print
01229 885006
Carp Lodge
Ulverston
 
Cl & Lj Garnett
01229 716119
1 Fellview Barn
Broughton in Furness
 
David Webb Building
01229 775431
The Hollow
Millom
 
Chris Hull Construction Ltd
01229 716821
2 New Street
Broughton in Furness
 
Ausobsky D
01229 774257
High Brow Farm
Millom
 
Watson Bros
01229 716565
Tree Tops
Millom
 

Fallen Arches

Provided By:

Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: October 1, 1995

By William G. Bailey

Abstract:

Some residential designers and builders have failed to recognize that all brick arches are structural masonry and must be designed according to structural principals.

Arch Types and Terms
The types of arches most commonly used in residential construction are: jack, segmental, semicircular, and parabolic. Arches typically are classified as "minor" or "major." Minor arches are used to span openings of up to 6 feet and support vertical loads of less than 1,000 pounds per lineal foot. Major arches are those that span more than 6 feet and can support vertical loads greater than 1,000 pounds per lineal foot.

Thrust Loads
Although they carry loads in compression, masonry arches impart horizontal thrust loads at each end or "skewback." The abutments at each side of an arch must be strong enough to resist these loads. Most problems occur in arches that frame into columns. In residential construction arches frame into a column that often consists of a 4x4-inch wood member. Brick are laid merely to enclose the wood column. Such hollow brick columns offer little or no resistance to thrust loads. Various methods can be used to resist thrust loads. When feasible, avoid framing arches into columns and instead place arched openings in walls. Alternatively, increase the strength of columns by increasing their cross section and adding reinforcing steel and grout.

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