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Moment Connection Design or Rigid Connection design is made automatically according to the Design, Calculation, and Construction Principles of Steel Structures and AISC 360-16 (ASD and LRFD) regulations. Bolt, weld, plate, geometry, and strength controls are done automatically following the steel connection type.

The Moment Connection in ideCAD Structural is a joint that transfers bending moment forces between a steel column and steel beam (or any other two steel members). If a child member (a steel beam) has some internal moment, the connection should be able to transmit the load due to that moment.

While The Shear Connections in ideCAD Structural depend mostly on the web of a section, moment connections add to that by strengthening the connectivity of the flanges. This can be achieved by using plate stiffeners, welds, or other fixtures that strengthen and increase the rigidity of the connection between members.

Moment connection types are listed below.

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Moment Connection Design with ideCAD

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ideCAD Structural is an All-in-One Structural Engineering Software with Moment Connection and many other Integrated Building Information Modeling (BIM) tools.

 Design Criteria for Moment Connections

• Moment connections are classified as rigid and full/partial strength connections.

• For rigid connections, end plate and welded connections are classified according to the rotational rigidity defined according to the earthquake regulations, depending on the ductility level.

Guideline for End Plate Connections

• The strength of the end plate connection is determined by the assumption that the tensile force of the bolts on one part of the plate and the compressive forces of the bolts on the other are controlled by the bearing limit state.

• If there is no axial load on the connection, the total tensile and compressive forces are equal and opposite in both parts, which creates a force pair.

• To simplify the calculations, it is assumed that the center of rotation is in the center of the compression part.

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Guideline for Splice Connection of Columns/Beams

• To suit the design under reversible forces such as earthquake forces, symmetrical and equal numbers of bolts are used on both flanges and webs. ideCAD does not allow asymmetrical connection during modeling.

• It is assumed that the flanges carry the moment and the web carries the shear force, while the axial force is equally shared between both flanges.

• The gap is left between the beam splices, while the column splices may or may not be left.

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