Chapter 8 - Beam-Columns

7/26/2019 Chapter 8 - Beam-Columns

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CE134

-

STRUCTURAL STEEL

DESIGN

J. Berlin P. Juanzon PhD



Beam-Columns

Structural members that aresubjected to combined axial and bendingloads are called beam–columns. Beam–

columns could be part of braced framesor un-braced frames (i.e., momentframes); the design of these columns will

differ depending on whether thebuilding frame is braced or un-braced.



Beam-Columns

Braced FramesIn buildings with braced frames, the

lateral loads are resisted by diagonalbracing or shear walls. Braced frames arealso referred to as non-sway frames or side-sway-inhibited frames.

In braced frames, the beams and girders

are connected to the columns with simpleshear connections that have practically littleor no moment restraint



Beam-Columns

Unbraced Frames

Unbraced, or moment, frames (alsoreferred to as sway frames or sidesway-uninhibited frames) resist lateral loadsthrough bending in the columns and girders,and the rigidity of the girder-to-columnmoment connections.



Type 1: Columns in buildings with braced framesIn this case, the moments result from the

eccentricity of the girder and beam reactions.

Therefore, the moment due to the reactioneccentricity is

M=Pe

where e is the eccentricity of

the girder or beam reactions



Type 1: Columns in buildings with braced framesIn this case, the moments result from the

eccentricity of the girder and beam reactions.

Therefore, the moment due to the reactioneccentricity is

M=Pe

where e is the eccentricity of

the girder or beam reactions

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Chapter 8 - Beam-Columns