Took my kid to the science museum in Cleveland and saw a model of a bridge truss

They had this big cutaway model showing all the internal supports. It was a simple 2D drawing blown up into a 3D thing you could walk under. I draft steel frames all day, but seeing it that big made me notice how the load paths were drawn with these thick, colored lines right on the model. It clicked that my shop drawings need to be that clear for the guys in the yard, not just correct for the engineer. I've been adding more detail notes, but maybe a simple color layer on my PDFs for the main members would help. Has anyone tried adding a basic color code to their structural sheets for fabrication?

4 comments

4 Comments

jasonallen2mo ago

A buddy of mine runs a small fab shop and got some drawings for a canopy frame. The engineer's sheets were technically perfect but just black lines on white. His crew spent an hour just figuring out what was the main spine versus the braces. He asked for a revised set with the primary chords in red, and it cut their layout time in half. The color made the intent obvious at a glance. It's a small change that can really stop mix-ups before they happen.

ivanscott2mo ago

Yeah, color coding is a game changer. The shop guys will love it.

betty_kelly92mo ago

Totally agree with @jasonallen. It's not just about making it pretty. A simple thing like red for load bearing parts and blue for secondary supports stops so many mistakes. I've seen guys weld the wrong piece because two lines looked the same in a stack of drawings. Color makes the job flow way faster when you don't have to stop and decode every single line.

jason_lewis31mo ago

23 years ago my dad helped build a pedestrian bridge over a creek near where I grew up. The engineer put little triangle marks in the corners of the drawings to show which bolts were structural and which were just holding the handrails. One of the welders missed that detail on a Friday afternoon and put all temporary bolts on the main support beam. They caught it Monday morning before anybody walked on it but it took two extra days to fix. That's why I'm a fan of any system that makes the important stuff jump out at you without needing a magnifying glass.