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  1. rogerroll

    Vertical component of seismic acceleration

    Hi! The local utility's engineering standard for power transformers states that the vertical component of a seismic acceleration be combined with one horizontal component (pretty obvious) Is this vertical component either upwards OR downwards? Is the resultant always further combined with the...
  2. rogerroll

    How to Calculate Natural Frequenecy of Steel Structure

    Thanks to everyone! I am presently trying CadrePro to see if I can learn something about FE! Chances are I'll have more questions! Roger
  3. rogerroll

    How to Calculate Natural Frequenecy of Steel Structure

    I appreciate all your help, guys! I tried a demo of Cosmos DesignStar (FEA) Wow, it's expensive! $10,000! Which FEA software do you guys know/use/recommend? Thanks!
  4. rogerroll

    How to Calculate Natural Frequenecy of Steel Structure

    Machinery's Handbook, Roark's Formulas for Stress and Strain, etc. All these books help to find strengths, moments and frequencies of simple-ish beams. But what about support structures with braces and cross-bars? What's the procedure for determining the Natural Frequency of an assembly that's...
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