Structural plan symbols
Common symbols used in structural engineering drawings. These symbols represent connections, framing systems, and slab conditions. Note that each structural engineering office may use their own variations, always check the project symbol legend.
Moment Connection
Represents a rigid connection between structural members that can transfer both forces and moments
Cantilevered Moment Connection
Indicates a moment connection with cantilevered configuration extending beyond support
Braced Frame
Shows diagonal bracing within a structural frame system for lateral stability
Steel Column Encased in Concrete
Identifies structural steel columns surrounded by concrete for fire protection or composite action
Slab Opening
Designates openings or penetrations through floor or roof slabs for stairs, elevators, or MEP
Stepped or Depressed Slab
Shows elevation changes or depressions in slab surfaces for drainage or level transitions
Span Direction
Indicates the direction structural members span across supports, typically for deck or slab framing
Structural plan symbols can vary significantly between engineering firms and projects. The symbols shown here represent common conventions, but you should always refer to the specific project's symbol legend sheet for accurate interpretation. When in doubt, consult with the structural engineer of record.
Symbol reference courtesy of Archtoolbox. For the most up-to-date symbols and additional resources, visit their website.
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