[TowerTalk] stretched EHS

[Lux, Jim]

On 10/12/22 3:24 PM, Steve Maki wrote:
> I should have mentioned that the guy wire in question is ~330' long, 
> and elongated by ~6". I know - it's amazing that it didn't break.
>
It's a fair ways from yield (fy) to failure  (fu) for steel. I don't 
know the alloy here, but looking over a table, it looks like fu is 10% 
higher than fy for most of the "high strength" steels.


EHS 3/8" seems to be 15,400 lb breaking strength.



> -Steve K8LX
>
> On 10/12/2022 2:29 PM, Steve Maki wrote:
>> I have a question for the materials crew here. I'm writing up a job 
>> report.
>>
>> Our crew went to a site where a huge tree had fallen on the two lower 
>> guys of a 360' tower. We carefully (well as carefully as we could) 
>> slacked off & disconnected one wire at a time, threw it over the 
>> tree, and reconnected it. At that point the site was ready for the 
>> tree crew to come.
>>
>> It was obvious that one of the wires (3/8" EHS) had stretched a few 
>> inches. There were enough unused threads in the turnbuckle to enable 
>> a good snug wire again.
>>
>> I'm recommending that the guy wire be replaced, but was wondering how 
>> much strength in roundabout numbers is lost in this scenario?
>>
>> TIA
>>
>> -Steve K8LX
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