Fallen Arches Kirkby Stephen

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

E M Treece
01768 371221
42 South Road
Kirkby Stephen
 
Metcalfe P
01768 352745
Mid Town Cottage
Appleby in Westmorland
 
Bainbridge K
01768 351291
Midtown Farm
Appleby in Westmorland
 
P Mawdsley
01768 353171
13 Drawbriggs Court
Appleby in Westmorland
 
J W R Allen
01768 361320
Oakbank
Appleby in Westmorland
 
J M Smith Building Construction
01768 341230
Brow House
Kirkby Stephen
 
Barker G A & J
01768 341207
Dyke Nook
Appleby in Westmorland
 
W A Developments Ltd
01768 353333
Station Road
Appleby in Westmorland
 
Potts F & Son
01768 351544
The Sands
Appleby in Westmorland
 
Charles Booth
01768 351678
Mews House
Appleby in Westmorland
 

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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