Moment Connection

Definition

A connection between two structural members that is highly resistant to rotation between the members, as differentiated from a pin connection, which allows rotation. A rigid or semi-rigid column-to-beam connection.

Purpose

Moment connections provide structural stability by resisting rotational forces at the joints, ensuring that the connected members act as a single unit. They are essential in the construction of frames that must withstand lateral loads, such as those from wind or earthquakes.

Examples of Use

• Steel frames: Connecting beams and columns in steel-framed buildings to resist lateral forces.
• Bridges: Using moment connections in the construction of bridge supports to ensure stability and load distribution.
• High-rise buildings: Providing rigidity to the structural framework to resist sway and lateral movement.

Related Terms

• Pin Connection: A type of joint that allows rotation between connected members.
• Rigid Frame: A structural system with moment connections that provide resistance to lateral forces.
• Shear Connection: A connection that primarily resists shear forces rather than rotational forces.

Notes

• Moment connections require precise design and construction to ensure they provide the necessary resistance to rotational forces.
• They are often used in conjunction with other types of connections and structural systems to achieve overall stability and strength.
• Regular inspection and maintenance are crucial to ensure the integrity and performance of moment connections over time.