[TowerTalk] Guyed towers flexible restrains

Mark Foigel markfoigel at 012.net.il
Mon Jan 29 14:39:20 EST 2007


Thanks a lot Hank, tha is helping.

Regards,

Mark

 

-----Original Message-----
From: Hank Lonberg [mailto:kr7x at comcast.net] 
Sent: Sunday, January 28, 2007 8:57 PM
To: 'Mark Foigel'; towertalk at contesting.com
Subject: RE: [TowerTalk] Guyed towers flexible restrains

 

 

Mark:

 

The guys in a guyed tower are actually non-linear. It is

difficult to assign a spring constant to them. 

 

I model guyed towers in my FEA programs with the guys  as

tension only cables the programs also allow for the catenary

behavior. The analysis is iterative until a lower limit of

error is attained something on the order of  0.01 pounds for

summation of forces in equilibrium.

 

A ball park number may be say 0.6 of the breaking force with

say 1" of elongation. They are steel so you could use

steel's stress-strains characteristics as long as you are

below the elastic limit. 

 

The conservative hand calculation assumption of a pinned

support gives a little larger bending moments in the tower

sections  or mast but that falls with the assumption of

pinned supports with no lateral deflection. 

 

 

Regards

Lonberg Design Group, Ltd.

 

H.S. Lonberg, P.E.,S.E. / KR7X

President

 

-----Original Message-----

From: towertalk-bounces at contesting.com

[mailto:towertalk-bounces at contesting.com] On Behalf Of Mark

Foigel

Sent: Sunday, January 28, 2007 11:39 AM

To: towertalk at contesting.com

Subject: [TowerTalk] Guyed towers flexible restrains

Importance: High

 

Hi,

 

Computing the mast itself:

 

What will be the adequate model so to assess rigidity of the

partial

restrains ("spring type"), as normally provided by the guys

in a continuous

beam model assumption for the mast?

 

Appreciate a lot,

 

Mark

 

 

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