18.7.3 Minimum Flexural Strength of Columns
|∑ Mnc≥ (6/5)∑Mnb||(22.214.171.124)|
∑Mnc is sum of nominal flexural strengths of columns framing into the joint, evaluated at the faces of the joint. Column flexural strength shall be calculated for the factored axial force, consistent with the direction of the lateral forces considered, resulting in the lowest flexural strength.
∑Mnb is sum of nominal flexural strengths of the beams framing into the joint, evaluated at the faces of the joint. In T-beam construction, where the slab is in tension under moments at the face of the joint, slab reinforcement within an effective slab width defined in accordance with 6.3.2 shall be assumed to contribute to Mnb if the slab reinforcement is developed at the critical section for flexure.
Flexural strengths shall be summed such that the column moments oppose the beam moments. Equation (126.96.36.199) shall be satisfied for beam moments acting in both directions in the vertical plane of the frame considered.