I’m looking at doing some product improvement on my Male/Female balustrading leg .
Whilst the loadings required in AS1170 have not changed , the recent AS 1288 has (finally) specified testing procedure .
Plus there is talk of increasing the loadings and more jobs are after Testing Certs .
I designed the systen over 20 years ago and it has worked well but I want to strengthen it .
Generally it is a 45×30mm two part leg . All loads are imposed on the 30mm face .
Under load the leg is not subject to twisting as it is braced by the rails and undercap .
My Q is basically .
Is there any difference in strength between a 45×30 leg with the 45mm walls one of 5mm and one of 3mm , or a 4/4 or 4.5/4.5 combo .
The asymetrical one has advantages due to screw flutes , spigots and assembly .
Having a thick leg is not a cost consideration as I own the dies and the cost is proportional to the total kg/m of leg .
I may go thicker but certain alloys dont like going too thick (6061 T6 ) to guarentee T6

Thanks in advance .

Brett

Thomo said:

I’m looking at doing some product improvement on my Male/Female balustrading leg .
Whilst the loadings required in AS1170 have not changed , the recent AS 1288 has (finally) specified testing procedure .
Plus there is talk of increasing the loadings and more jobs are after Testing Certs .
I designed the systen over 20 years ago and it has worked well but I want to strengthen it .
Generally it is a 45×30mm two part leg . All loads are imposed on the 30mm face .
Under load the leg is not subject to twisting as it is braced by the rails and undercap .
My Q is basically .
Is there any difference in strength between a 45×30 leg with the 45mm walls one of 5mm and one of 3mm , or a 4/4 or 4.5/4.5 combo .
The asymetrical one has advantages due to screw flutes , spigots and assembly .
Having a thick leg is not a cost consideration as I own the dies and the cost is proportional to the total kg/m of leg .
I may go thicker but certain alloys dont like going too thick (6061 T6 ) to guarentee T6

Thanks in advance .

Brett

Hi Brett, as you are the expert in this situation,

if I were to ask you the same question, what would your reply be?

“if I were to ask you the same question, what would your reply be?”

Simply that I do not know if a 5/3 is stronger than a 4/4

Brett

Thomo said:

“if I were to ask you the same question, what would your reply be?”

Simply that I do not know if a 5/3 is stronger than a 4/4

Brett

Thomo!

We have you been?!

For some reason, i was wondering about you a week or two back.

I can’t help you, sorry.

Hey Captain , Michael
Brett

Thomo said:

Hey Captain , Michael
Brett

Hay’s ninety three miiles that way, points.

This might help

https://www.engineersedge.com/materials/aisc_structural_shapes/aisc_structural_shapes_viewer.htm

Thomo said:

Hey Captain , Michael
Brett

:)

> “Whilst the loadings required in AS1170 have not changed …”

Memories.

AS1170 was my bread and butter when I first joined CSIRO and for quite a few years after.

mollwollfumble said:

> “Whilst the loadings required in AS1170 have not changed …”

Memories.

AS1170 was my bread and butter when I first joined CSIRO and for quite a few years after.

Part 4 or all of it?

I’m on the Standards 1170.4 committee now.

The Rev Dodgson said:

mollwollfumble said:

> “Whilst the loadings required in AS1170 have not changed …”

Memories.

AS1170 was my bread and butter when I first joined CSIRO and for quite a few years after.

Part 4 or all of it?

I’m on the Standards 1170.4 committee now.

Phoaw.

Peak Warming Man said:

The Rev Dodgson said:

mollwollfumble said:

> “Whilst the loadings required in AS1170 have not changed …”

Memories.

AS1170 was my bread and butter when I first joined CSIRO and for quite a few years after.

Part 4 or all of it?

I’m on the Standards 1170.4 committee now.

Phoaw.

I was for a few years, the NSW Divisional Convener of the Australian Stratigraphy Commission.