asce 7-20 non building

huangyhg

asce 7-20 non building
i am a mechanical engineer designing a skid 6ft x 34ft with 8 legs holding process up about 6ft above grade. the customer wants it designed per "non building", asce 7-02, section 9.14.
i have cross member bracing on the 8 legs. in the 34ft side, one end of each brace is welded at the bottom of one leg and the opposite end of the brace is welded at the top of the next leg. does that design constitute a "steel eccentrically graced frame, moment resisting, connection at columns away from links" per table 9.5.2.2.
finally, any recommended text books or handbooks for basic structural design and column-beam connections for a mechanical engineer?
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my first thought would be to use 9.14.5.2, "rigid" non-building structures, which seems to simplify things.
aisc asd and lrfd manuals have some structural detailing in them.  you're not obligated to follow them necessarily.
on stuff like this, unless you're building a lot of identical units, it is sometimes more economical to modify the construction just to simplify the design.  use rectangular tubing instead of angles, for example.
sounds like an ordinary concenrically braced bay to me
we did a modal analysis on the frame and found t>0.06 so we couldn't use the rigid model method.
i thought "concentric" meant 2 braces (facing each other) connected at 2 columns and connected at the center of a common beam. as designed, i have 1 brace connected to the low end of 1 column and the top of the next column.
am i helping or misunderstanding everything?
a conentric braced frame is one were all the members meet at nodes. essentially a concrentric braced frame is a truss. all the members are loaded in only axial compression or tension.a conncetric braced fram can have several configurations
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*   *   *  or *    *   *  or  *  * *  *
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*        *      *         *   *       *
an eccentric braced brame is one where the members do not meet at a common point. because the members do not meet at a common point the members induce bending in some of the   
i'm sorry the little "drawings" did not come out so well.  
conncentric braced frames
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or
or
eccentric braced frames
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or
ok some more eccentric frames then i am going to bed
thanks tfl! big help.
next question deals with asce 7-02, 9.5.2.4.2. for this skid, what r(max) do i use?