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- To: seaint(--nospam--at)seaint.org
- Subject: Re: Greetings!
- From: "Peter McCormack" <PMac(--nospam--at)realloghomes.com>
- Date: Thu, 5 Oct 2000 11:02:49 -0400
- Priority: normal
Arman Regardless of the software your using, your questions relate more to the analysis approach rather than the specifics of the program. Your approach is dependent on the level of suffication and what are you determining. You can break the tower down to a number of 2D plane frames i.e the 4 sides, diaphrams, crossarms. (oh..the days of 2D analysis and non graphical input are coming back to haunt me) or, define it as a space frame as you describe. Since you have the power of the software there, space frame is the approach I would take because now you can play the whole torsional game on the tower checking what happens under unbalanced conductor spans, broken conductor conditions etc. Of course, you now have to check different tower configurations....deadend(terminal), in-line towers, deviation angle towers etc. Then of course, are you designing self supporting lattice towers, guyed lattice, etc.....?????? If transmission lines is your main function, it may have been better to purchase software such as PLS-CADD and associated programs (i.e. Tower) which would do all the terrain modeling, sag - tension etc. functions. ASCE has a number of manuals that can give you guidance. #52 - Guide for Design of Steel Transmission Towers #74 - Guidelines for Electrical Transmission Line Structural Loading just to name a few...... I hope these comments help.... Peter McCormack Date sent: Thu, 5 Oct 2000 23:49:07 -0600 From: "arman s rivera" <asrivera(--nospam--at)edsamail.com.ph> To: seaint(--nospam--at)seaint.org Subject: Greetings! Send reply to: seaint(--nospam--at)seaint.org Organization: http://www.seaint.org Dear fellow engineers! Greetings! I am Arman Rivera, a practicing structural engineer in the Philippines. Our firm recently purchased the software Staad Pro 2000 and from the limited hands-on I have had on it, this software is remarkable. However, as I've been reading the manual that came with the software, I have many questions regarding it. Is anybody familiar with Staad Pro 2000 that won't mind answering questions from a novice user? I've been using Staad Pro 2000 to design communication towers. My first question is, should the tower be classified as SPACE or TRUSS? What I've done is to treat it is a space and then assign the moment releases at the end of the diagonals and verticals only (not the main posts), so that these members would carry only axial forces. Is this correct? My next question is on the support conditions. I have modeled the mat foundation using finite elements in Staad Pro 2000. I have defined the joint supports as ELASTIC MAT by specifying the modulus of subgrade reactions (kv). Given the allowable soil bearing capacity, how is the modulus of subgrade reaction computed? I have many more questions regarding this software, any help you could give me would be greatly appreciated. Thank you very much. Regards, Arman S. Rivera __________________________________ www.edsamail.com
- From: arman s rivera
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