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Red Nova
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Join Date: Mar 2011
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How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/30/2011 6:04 AM

Hi.

Is it necessary to put a washer under the bolt's head or it is necessary only under the nut?

Mentioned connections are designed for lattice towers.

If someone will give his advice I ask also to refer to any standard (USA or European).

Thanks in advance.
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passingtongreen
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#1

Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/30/2011 7:56 AM

A washer is required under the turned element for A325 and A490 bolts here in the USA.

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CaptMoosie
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#2

Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/30/2011 11:23 AM

Per AISC Steel Manual washers are required under both the Hex Head bolt head and the nut....

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ba/ael
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#3

Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/30/2011 12:42 PM

It depends. See Section 6. "Use of Washers" in this standard.

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Red Nova
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#4
In reply to #3

Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/31/2011 2:42 AM

Thanks for the link.

I have a snug tightened joints. And for them the rule is following:

6.1. Snug-Tightened Joints
Washers are not required in snug-tightened joints, except as required in Sections6.1.1 and 6.1.2.
6.1.1. Sloping Surfaces: .........
6.1.2. Slotted Hole: .........

As I have a usual case so I suppose that no washer is needed.

But it is strange for me that nothing is mentioned about lock-washers usage, and about simple washers under them. Also I didn't find information about lock-nuts.

Usually bolted connection of our towers include 1 nut, 1 lock-washer and 1 washer, or 1 nut, 1 lock-nut and 1 washer. But I don't find any standatd which will approve that we do it in a correct way.

"Specification for Structural Joints Using ASTM A325 or A490 Bolts" is giving rule for washers, but question is open for lock-washers and lock-nuts...
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NEXTMIKEB
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#6
In reply to #4

Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/31/2011 11:05 AM

JUST BECAUSE A STANDARD DOES NOT ADD CERTAIN PARTS TO YOUR ASSEMBLY DOES NOT MEAN YOUR STRUCTURE WOULD NOT BENEFIT FROM IT. SOME TIMES YOU NEED TO GO ABOVE ANY BEYOND. ALTHOUGH I OVER ENGINEER MOST THINGS.
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ba/ael
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#7
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Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/31/2011 11:22 AM

Article 23.1 of CSA S16-01 entitled "A 307 Bolts" states:

Nuts on A 307 bolts shall be snug-tightened. When so specified, nuts shall be prevented from working loose by the use of lock washers, locknuts, jam nuts, thread burring, welding or other methods approved by the designer.

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M Daniels
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#5

Re: How Many Washers Must Be Included in Bolted Connection for Steel Construction

03/31/2011 4:52 AM

These are the Locknuts used by the major tower builders in the UK.

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ba/ael (2); CaptMoosie (1); M Daniels (1); NEXTMIKEB (1); passingtongreen (1); Red Nova (1)

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