Depending on the joints connection we can have two types of frames called moment resisting frame and braced frame.

Moment Resisting Frame

In moment resisting frames, beam and column joints are made rigid allowing moment to transfer across joint. During concrete frame construction members are cast monotonically making the joint rigid. Almost all concrete frames are moment resisting frames because of these joints.

moment resisting frame
MRF action having rigid connections

In case of steel and timber frames we can get rigid connection. A typical rigid connection is shown in the image given below. These types of connection are not easy to construct and are expensive as well.

Properties

Unlike braced frame, moment resisting frame resist lateral loads directly in form of column moments and shear. Lateral load from each story is transferred at the base with some moment because of the rigid joint.

 

Braced Frame

Steel frames are usually braced having “Pin” connections. These pin connections ensures that there is no moment transfer across joints. Some type of bracing is needed to make these frames stable. Typical example of braced steel frame is shown below.

braced steel frame
Braced steel frame

Properties

When lateral load is applied to a braced frame, it is resisted by bracing. Lateral load is transferred as an axial load to the bracing. so the bracing is either in tension or in compression and there is no moment because of pin connection.

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Civil Engineer MSc from National University Of Sciences And Technology.

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