Structural Design of Stone 3

[WillisV]

Does anybody have any structural design guidelines/recomendations for stone (e.g. granite etc)? I am looking for typical allowable bending stresses, safety factors, really any type of codified guidance.

 

[msquared48]

Nothing set in stone that I know of, other than deflection limitations.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[bookowski]

Try mining references.

Do a Google Books search for: 'stone allowable tensile stress' and quite a few books come up that you can preview. You may be able to get an idea of what you need from the free preview portion of google books.

I saw this one - 'Rock Mechanics - A Challenge for Society' which lists granite tensile strength of 2MPa to 12MPa

 

[Ussuri]

There is a little bit in the UK masonry code BS 5628. Extract below.

19.1.10 Natural stone masonry
The characteristic compressive strength of stone masonry with bed joints 10 mm thick or less, and in
mortar designation (iii) or stronger, may be taken as 0.35 times the mean compressive strength of the
natural stone masonry units or representative cubes when prepared in accordance with BS EN 771-6 and
tested in accordance with BS EN 772-1. Where the strength is derived from cubes, consideration should be
given to the direction of any bedding planes, see BS EN 771-6.

19.1.11 Random rubble masonry
The characteristic strength of random rubble masonry may be taken as 75% of the corresponding strength
of natural stone masonry built with similar materials. In the case of rubble masonry built with lime mortar,
the characteristic strength may be taken as one-half of that for masonry in mortar strength class M2
(designation (iv))

There is also BS 5390 Code of Practice for Stone Masonry, although this is more directed at materials and construction rather than design. There is also the old UK masonry code CP 111 which might have something.

I also think there might be a little guidance in the IStructE Manual For Design Of Plain Masonry Building Structures. I dont have my copy to hand so cant check.

Not much, but might give you some leads.

 

[bridgebuster]

This is a link to the Indiana Limestone Institute - I know it's not granite - but they have a handbook available for download, which gives safety factors and allowable bending stress based on the modulus of rupture.

http://www.iliai.com/pages/Handbook?pageId=1

 

[bridgebuster]

Look at these also

http://www.wbdg.org/design/env_wall_thin_stone.php

National Building Granite Quarries Association (NBGQA)

 

[WillisV]

Bridgebuster - Bravo sir, exactly what I was looking for.

 

[bridgebuster]

no problem. Good luck

 

[ishvaaag]

Some additional info from p.i.e.t. 70 from the ietcc, which continues to be a landmark reference for any kind of unreinforced masonry calculations, attached.

Also, my extract from 4 references of typical values of the characteristic compressive strength to be compared with stresses from factored combinations.

http://www.google.es/url?sa=t&rct=j...qIC4Bw&usg=AFQjCNFWn9H6DAfDiujsSHTNzdggBTDTIg

p.i.e.t. 70 has also plenty info on deformability, ways of calculation, combinations etc; unfortunately I don't find a electronic book reference to it.

For cladding in stone this publication maybe more along the lines of your interest

Modern stone cladding: design and installation of exterior dimension stone systems
Michael D. Lewis, editor.
(ASTM manual series: MNL 21)
"ASTM publication code number (PCN) 28-021095-10."
ISBN 0-8031-2061-3