• Review Points

Connections

• The terms connection and support are closely related, and are often used interchangeably in informal discussion.

• In formal modelling, connection refers to force-displacement constraints among members in a model, while support refers to force-displacement constraints between the model and objects outside the model.

• Connections can be classified and understood from (at least) three basic perspectives:
  • Structural action:
    • Motion restrained, forces transferred.
  • Construction type:
    • Bolt, weld, etc.
  • Force transfer mechanism:
    • Friction, bearing, bond, continuity.

Basic Concepts

Articulation

Using connections to manipulate overall structural behavior by releasing selected internal forces at key points.

ISS

KM


ISS

Arrangement

Organizing framewoks and connections around a structural plane

Double member with a single connector piece.

Singe member with double connector.

Combination of single and double member, with no connector pieces.

Combination of single and double members on different axes.

Converging centerlines to a point

Double member with a single connector piece, called a gusset plate.

Each member must have sufficient "bite" into the plate for enough bolts or weld contact. Note configuration.

Converging centerlines enable equlibrium without member moments.

Examples