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ANGLES IN BENDING TO BS5950-1:2000 thread507-84529

SARAHJONES (Structural) 19

Jan

04

8:53

Having been brought up on BS449, I recently had to design angles to BS5950-1:2000 and found the whole process very complicated! Does anyone

have an example of a calculation, particularly for UEs? Although the blue book gives various parameters for appendix B.2.9, it does not give them all.

I'd like a shortcut, rather than working all the properties out from first principles!

pba (Structural) 20

Jan

04

8:21

Are UE's unequal angles? What parameters can't you get from the published data? I've never had to design angles to the latest version of the code

but I used to have a spreadsheet for the old version which simply contained all of those little subformulas and formulas (seven listed in BS5950-

2000). This saved time in the calculation but was still presented as a 'hand calculation'. I've no longer got the spreadsheet.

This principle applies to a lot of BS5950 design and is especially useful for the appendices where they hide all the complicated stuff!

Good luck its not really that bad a code to work to.

SARAHJONES (Structural) 21

Jan

04

4:44

Thanks for that. I do use BS5950 on a daily basis, but hadn't designed an angle in bending for a while! I am writing a spreadsheet, but wanted to

know if there were any published data for Zuu, Zvv etc.

Just to check the method:

1)Cl 4.3.8.2 - resolve Mx into Mu and Mv

2)B.2.9 - calc lambda LT.

3) 4.9 to I.4 - does this mean use all values for u and v axes? If so pcu is based on Le/ru etc and Zu and Zv, mu and my etc to be used. BUT what do

I use for Mb? Is it just pbZu?

Some UEs are slender, but presumably I have use I.3 rather than Mb = pbZueff?

As I said, it's complicated! But if my above method is correct I will finish the spreadsheet and send it to anyone interested (with all the ususal

caviats).

EIT2 (Structural) 21

Jan

Proceq Middle Eastwww.proceq.com

Inventor of Portable Leeb Rebound Hardness Testers - Equotip

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Page 1 of 2Structural engineering other technical topics - ANGLES IN BENDING TO BS5950-1:2000

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04

6:23

What is BS5950?

Thank you!

Kapitan (Aerospace) 21

Jan

04

7:14

EIT2, in the UK these are British Standards.

From GOOGLE search for British Standard 5950,

BS 5950-1: 2000 - Structural use of steelwork in

building. Code of practice for design - Rolled and

welded sections.

pba (Structural) 21

Jan

04

7:46

Sarah. - Yes I think your approach is correct - My annotations are below

1)Cl 4.3.8.2 - resolve Mx into Mu and Mv - note that My (if present) also needs resolving to Mu and Mv.

2)B.2.9 - calc lambda LT. - Agreed

3) 4.9 to I.4 - does this mean use all values for u and v axes? If so pcu is based on Le/ru etc and Zu and Zv, mu and my etc to be used. BUT what do

I use for Mb? Is it just pbZu? - Yes thats my understanding, You design the section replacing #x terms with #u and #y with #v. I would take it that

the absence of Su and Sv terms from the data indicates that Zu and Zv should be used.

Some UEs are slender, but presumably I have use I.3 rather than Mb = pbZueff?- This one I don't know - try not to use slender angles?!?

Again, good luck

linslade (Structural) 23

Jan

04

10:59

The 'new' section properties for angles can be found in BS EN 10056-1:1999. Specification for Structural Steelwork Equal and Unequal Angles. I

believe that this was the old BS 4.

Regards

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