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RE: Greetings![Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Greetings!
- From: "Sherman, William" <ShermanWC(--nospam--at)cdm.com>
- Date: Fri, 6 Oct 2000 20:35:17 -0400
Arman Rivera wrote: > should the tower be classified as SPACE or TRUSS? In my earlier version of STAAD, it says that TRUSS can be used for either a plane or space analysis. If all of your members are only to be designed to carry axial loads the TRUSS command seems best to avoid the extra work of entering releases. But if you want to model the chords as continuous members, the SPACE command would be better - but can't you do a "list" of members to be defined as "truss" members, rather than entering end releases? As others have noted, you make encounter member instability errors when entering end releases, which require one end to have rotational restraint. > Given the allowable soil bearing capacity, how is the modulus of > subgrade reaction computed? Generally there is not direct correlation, although Bowles does give an equation for estimating purposes. In a previous thread on modeling the modulus of subgrade reaction, it was suggested to "bracket" the design by making runs with both a high and a low estimate of subgrade reaction, such as 50 pci and 300 pci. Most decently compacted soils should have a modulus in the range of 100 to 200 pci, so this seems reasonable.
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