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[HOW TO APPROACH THE STRUCTURAL SYSTEMS VIGNETTE]

May 6, 2012

Looking at the toilet room, seating area, kitchen area and prep & stor. rooms, it is highly efficient to draw the joists and decking as one continuous element spanning the rooms together.

Now lets draw the decking, joists, beams and columns for shop 1 and shop 2 using the using the techniques listed above.

Lets look for a second at the area in the red box above. I have seen this mistake on the forum often. There is NO BEAM required in this area. It does not carry any joists above it.

A simple thing to remember for beams is: DOES THE BEAM CARRY ANYTHING? YES – THEN I NEED A BEAM. It’s simple.. beams carry joists and walls above them. Beams on this vignette DO NOT act as drag struts..just beams

But wait! Doesn’t the area in the red box need a beam since it is carrying a wall? According to NCARB (as quoted from areforum.org), “All upper wall portions must be supported by a beam below, whether or not there is a partition in that lower location. The only situation which does not require a beam is if the higher level wall occurs at the perimeter of the building. An exterior wall can support the upper level without a beam.”

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