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Fallen Arches Coniston

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

Dugdale Allan
01539 441162
Browside
Coniston
 
G.d Usher & Son
01539 441217
Dixon Ground
Coniston
 
A W Bowness Ltd
01539 433375
Colwith Orchard
Ambleside
 
S M Dixon
01539 434537
40 Fisherbeck Park
Ambleside
 
Scott & Scott Building
01539 442914
Aysgarth
Windermere
 
W Watson Ltd
01539 441287
10 St Martins Court
Coniston
 
J M Kellett
01539 436485
Red Lion Yard
Ambleside
 
C P Lishman Ltd
01539 433681
29 Kingfield
Ambleside
 
Cook & Lakin
01539 433209
4 Kelsick Road
Ambleside
 
Michael J Withers
01539 434203
Briardale
Ambleside
 

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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