I have a question about modelling dynamic response factor in MS Tower for guyed masts using the zgust parameter.
I did a dynamic analysis and found the first mode was 0.97Hz. As per AS1170 the dynamic response factor has to be calculated if the
structure frequency < 1.
I calculated the dynamic response factor at each guy level (shown below). What’s the simplest way to model the increased wind load
at each guy level in MS Tower using zgust?
If zgust is used in a load case, does it ignore the loading on the rest of the structure? How do I combine these load cases into one
combination?
Image may be NSFW. Clik here to view.
Image may be NSFW. Clik here to view.
Cheers,
Josh Kidd
From: Josh Kidd Sent: Monday, 4 June 2018 11:39 AM To:'RAMSTAAD@communities.bentley.com' <RAMSTAAD@communities.bentley.com> Subject: RE: [RAM | STAAD Forum] Modelling parafil guys in microstran
The unrestrained length Lo defaults to the length of the member(chord length) if nothing is inputted there. To induce tension, the value you enter for Lo would be less than your chord length (e.g
if your chord length, distance between start and end node is 5 metres, your Lo of 4.9 metres is saying your cable has been pulled by 0.1 metres).
In the table on their website and your screenshots above they listExtension % at NBL(Net Breaking Load), and you also have theNBL itself
If we are going off the assumption that your cables are linear elastic (in tension) from No Load all the way up to NBL, you can work out the values the cable will be extended by with any given
load.
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