Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Analysis Standards - Nomenclature?

[Subject Prev][Subject Next][Thread Prev][Thread Next]

I don't know of any commercial software, but I use basically the same
system I started using out of school 20 years ago... Part of it comes
from the premise that all plans and therefore beams are viewed from the
bottom or right of the page (same as concrete beam schedules). 
Therefore all beams just have a right and left reaction, & occasionally
a mid reation.  All diminsions for location of loads & supports are from
the left.

The callouts are marked on a ref plan that is a layer of my cad dwg and
included in my calcs at a reduced scale.  We seem to be on the same
wavelength for most.. RR1, RR2 etc; CJ1, CJ2; RB1, RB2; FB1, FB2
etc....  When there is a change of level, I increase the number to the
next multiple of 10.  I try to code all the framing members on any level
before moving on as if one type.... headers are the most common
culprit... exceeds 10 on a level and forces the next lower level to be
H21, H22 for example, rather than H11, H12; then all the framing members
go to that number sequence for that level. (Yes I start at the top and
work down) So typically floor joists start with FJ11 or FJ21 rather than
FJ1.  With the subscript capabilities of Mathcad, I use R(sub)rtlFB1 as
the total reaction on the right of FB1.  I also have dl and ll

I use mathcad templates that use local variables such as P(sub1),
P(sub2) for the calculations, but at the start of each beam calc I
equate the loads to the correct reactions found prior in the document. 
The calculated reactions for each beam must be equated back from the
local variables to the global system, but it saves having to rework the
template variables for each member.

It has worked well for me and plan checkers find it easy to follow.
Sometimes a slight modification is required, but it is usually obvious
in the initial planning or labeling of the reference plan.  I've found
it's best to make the initial labeling scheme follow the intended order
of calculation.  I usuallly print the refernce plan on 11x17 paper so it
can be folded out and be to the right of the calcs and still bound to
the packet.  The left half of the 11x17 page is usally blank.

I'm always looking for little ways to improve it, but it is pretty
simple and therefore pretty adaptable.

Steve Privett  CE