Design of Beam Column

[mowafi3m]

Design of Beam Column [Compatibility Mode]

Modes of failure of Beam- Column
Johnson [3] has mentioned a number of modes of failure that characterizes a beam-column behavior which are summarized as
follows:
 Failure by yielding: in the case of member subjected to bending moment and axial tension force.
 Failure by instability in the plane of bending without twisting for the case of beam-column that is transversely loaded but is stable w.r.t. Lateral torsional buckling.
 Failure by lateral torsional buckling for beam-column loaded about their strong axis without adequate bracing.
 Failure by instability about one of the principle axes for members subjected to axial compressive force and biaxial bending moment with stiff sections (W-shapes).
 Failure by combined twisting and bending for the case of thin walled open sections (that are torsionally weak sections) subjected to axial compression force and biaxial bending moment.

Design Criteria of Beam-Column
 Assessment of Buckling length
 Effect of P-
 Design of sections subjected to M,T and others subjected to M,N
 Checking local buckling
 Preliminary section design


Assessment of Buckling
Length
1. Kinds of buckling in beam column:
 Buckling out of plan (Lby) : will be governed by the vertical bracing profile
 Buckling in plan (Lbx) : will be governed by the end conditions of the columns and the relative stiffness between different
members.

Code:

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