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Anonymous Poster #1

How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 4:57 AM

I have a handrail made out of mild steel that has:

A outside diameter of 33.7mm with an internal diameter of 27.7mm

The handrail is straight at 1.432m and is 1.060m high.

It has to be able to with stand a uniform load of 0.36 kN/m.

And it also has to withstand a concentration load of 0.89kN.

How would I show this?

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#1

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 6:34 AM

Work it out using beam theory.

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Anonymous Poster #1
#3
In reply to #1

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 7:26 AM

I have been trying it. But i keep getting figures that I know are not correct.

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#2

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 6:56 AM

Hang some weights on it for 24 hours (giving 1.5 to 2 times the specified withstand load).

1N ≈ 0.102kgf, so 91kg will give you just over 0.89kN.

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Anonymous Poster #1
#4
In reply to #2

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 7:28 AM

It has to be a calculation. As i am unable to get access to the handrail.

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#5
In reply to #4

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 9:02 AM

Is it a real handrail or a homework problem?

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Anonymous Poster #1
#8
In reply to #5

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 9:36 AM

No a rail handrail.

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#15
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail.

10/19/2017 2:00 PM

It depends on whether the handrail ends are simply supported or fixed. Or maybe one of each. That depends on the details of the supports, and whether the section considered is on its own, at the end of a run of several sections, or in the middle of a run. Also whether you have to consider the uniform load and the point load simultaneously. You need to use a bit of judgement. I did calcs for supported and fixed, below.

For the simply supported case, it looks well over-stressed, ends fixed about OK.

That's ignoring the uprights, hence the 1.06m high. Checking that depends on whether the loads are vertically down or from any direction.

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#6

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 9:15 AM

It depends upon whether it is brand new or as rusty as f**k. The only way to do it is a practical test.

However, if it is a <...handrail...> and not a load-bearing structure, one might wonder whether it is being misappropriated.

<...have...> indicates that a practical test can be carried out. Go for it.

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#7
In reply to #6

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 9:36 AM

The <...have...> is why I suggested the practical approach.

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#11
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 9:47 AM

Great minds think alike.

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Anonymous Poster #1
#9
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 9:40 AM

Its a brand new handrail. Well its a guard rail.

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#10
In reply to #9

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 9:46 AM

Then it would be best not to misappropriate it as a lifting beam. Is someone there imposing unrealistic budget constraints in the hope of getting a cheap-as-chips solution? Don't subscribe to it - someone might get hurt or killed, and then fingers will point...

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#12

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 11:12 AM

The results depends upon the cross-section of this handrail, which you do not specify.

Ambiguous/insufficient input = on derivable answer unless assumptions are made, seemingly round.

Are you only considering the material of the handrail, or are you considering the points of attachment as well. There are other failure modes.

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Anonymous Poster #1
#13
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 11:49 AM

I have given the diameters of the handrail and the length of it also.

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#14
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 12:42 PM

OK, then the rail is strong enough in and of itself to support the load (normally).

The points of attachment might fail, as nothing was specified.

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#16

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 5:16 PM
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#17

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/19/2017 11:40 PM

In addition to basic beam theory stress and deflection calcs should probably check both section and column stability as well to ensure the rail doesn't buckle when deflected as concentrated loads become eccentric to the support points as the structure deforms under static load causing added bending moments (i.e. P-Delta effects)

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#18

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/20/2017 10:22 AM

We did handrails when I worked on Mezzanines years ago. The building codes specified the uniform and concentrated loads. The more important load was horizontal, not vertical. You need to consider the bending in both rail and post, and don't forget the load on the fastener(s) holding the post to the structure. Very important for us was the help the post got from adjacent runs of handrail. Due to deflection there would be a restoring force from the adjacent rail. A finite element analysis would be useful.

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#19
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/20/2017 11:50 AM

Yes, but AP#1 clearly did not pose his question in that manner. He seems to be referring to a single section of railing.

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#20

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/20/2017 3:19 PM

Forget calculations. A hand rail is a safety device, the design of which is spelled out in building codes in your corner of the world. You should first check to make sure your rail is in compliance before wasting your time re-engineering it.

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#21
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Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/20/2017 3:31 PM

That is actually the most lucid statement thus far!

Now that I have showered you with adulation, can I also be in the alpha quadrant?

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#22

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/21/2017 4:13 AM

The failure is unlikely to be the handrail. More likely the fixings to the wall or the material of the wall if the fixings are not correct.
Typical silly homework problem.
Del

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#23

Re: How Do I Calculate The Maximum Load I Can Put Onto My Handrail?

10/23/2017 6:52 AM

http://www.handraildesign.co.uk/products/product-specifier

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