How to read structural drawings
Helonic is an AI construction drawing analysis platform for people reading structural drawings during plan review.
A beginner's guide to understanding structural engineering plans
Structural drawings show the bones of the building: the columns, beams, slabs, and foundations that hold everything up. Understanding them is essential for coordination, safety, and avoiding costly mistakes. This guide covers the basics.
How are structural sheets organized?
Structural sheets typically follow this order:
What belongs on the first structural sheet?
The first structural sheet contains critical project-wide information:
- Design loads (live load, dead load, snow load, seismic criteria)
- Concrete strength specifications (typically in PSI)
- Steel grades (A36, A992, etc.)
- Reinforcing bar grades and cover requirements
- Foundation bearing capacity assumptions
- Reference codes and standards
What is the structural column grid?
The column grid is the reference system for the entire building:
Letters (A, B, C...): Typically run in one direction (often east-west)
Numbers (1, 2, 3...): Run perpendicular (often north-south)
Grid Intersections: Columns are located at grid intersections (e.g., "Column at B-3")
Intermediate Grids: Use decimals or letters (A.5 or AA) for grids between main lines
What do structural framing plans show?
Framing plans show the structural members at each level:
How do you decode structural member designations?
Structural member callouts contain specific information:
W = Wide flange shape
16 = Nominal depth in inches
40 = Weight in pounds per linear foot
HSS = Hollow Structural Section
6x6 = Width x height in inches
1/4 = Wall thickness in inches
12 = Width in inches
24 = Depth in inches
Reinforcing shown separately in sections/schedules
Why are structural elevations critical for coordination?
Structural elevations are critical for coordination:
What do structural schedules provide?
Schedules provide detailed information referenced from plans:
- Column Schedule: Sizes, reinforcing, and splice locations
- Beam Schedule: Sizes, reinforcing, camber requirements
- Footing Schedule: Sizes, reinforcing, bearing elevations
- Connection Details: Standard connection types referenced by number
Keep exploring
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