padstone headache

[sandraconnolly]

We are supposed to be sourcing the supplies for our builder. Our plans call for padstones in non-standard sizes. It reads....

R1: 225 x 225 x 100h mm padstone
(minimum padstone height if unreinforced: 86 mm)
Factored reaction = 53.52 x 1.50 = 80.28 kN
Masonry: 50N/mm2 brick, class (iv) mortar, normal const/special mfr, Class 1 bearing
Local design strength (factored) = 7.1 x 1.25/3.1 = 2.86N/mm2 (BS5628-1:2005 Table 2a) Factored stress under padstone = 1.50 x 53.52 x 1000/225 x 225 = 1.59 N/mm2
Newpier to built in minimum 50N/mm2 engineering bricks off new 850mm square concrete pad foundation.

R2: 400 x 225 x 200h mm padstone
(minimum padstone height if unreinforced: 173 mm)
Factored reaction = 47.85 x 1.50 = 71.78 kN
Masonry: 7N/mm2 brick, class (iv) mortar, normal const/normal mfr, Class 1 bearing
Local design strength (factored) = 2.44 x 1.25/3.5 = 0.87N/mm2 (BS5628-1:2005 Table 2a) Factored stress under padstone = 1.50 x 47.85 x 1000/400 x 225 = 0.80 N/mm2

R1: 300 x 100 x 150h mm padstone
(minimum padstone height if unreinforced: 134 mm)
Factored reaction = 16.62 x 1.50 = 24.94 kN
Masonry: 7N/mm2 brick, class (iv) mortar, normal const/normal mfr, Class 1 bearing
Local design strength (factored) = 2.44 x 1.25/3.5 = 0.87N/mm2 (BS5628-1:2005 Table 2a) Factored stress under padstone = 1.50 x 16.62 x 1000/300 x 100 = 0.83 N/mm2



I am having strouble finding someone who can supply non-standard sizes. Can we simply use bigger padstones perhaps?

Thanks!

 

[noseall]

We cast our own.

We lay down plastic sheet in the corner of the building and form shutter boxes using dense concrete blocks. Piece of cake.

We are supposed to be sourcing the supplies for our builder.

Why is your builder not sourcing his own mat's?

 

[RonnyRaygun]

As Noseall say, or order the standard size closest to (but larger than) the ones specified.

Or your builder could use engineering bricks with a strong (1:3) mortar at least as large as the size specified.

 

[tony1851]

As Noseall say, or order the standard size closest to (but larger than) the ones specified.

Or your builder could use engineering bricks with a strong (1:3) mortar at least as large as the size specified.

Where've you been?!

 

[noseall]

Where've you been?!

Chamonix skiing. Or did you mean Ronny?

 

[RonnyRaygun]

As Noseall say, or order the standard size closest to (but larger than) the ones specified.

Or your builder could use engineering bricks with a strong (1:3) mortar at least as large as the size specified.

Where've you been?!

Long hours and family are getting in the way of important stuff like DiyNot!

And every time I log in someone else (usually you Tony!) has already answered!

 

[tony1851]

I'll keep a low profile in future

 

[tony1851]

Chamonix skiing. [/quote]

Business must be good

 

[trowlerman]

You could use 3 courses of engineering bricks , or 225 deep concrete lintels cut to length .