Strong Column Weak Beam Conditions
9.3.2.1 - Earthquake direction is considered for beam-column joints of highly ductile moment-resisting steel frames or reinforced concrete encased steel structural systems according to the Eq. (9.7) in accordance with the condition that columns should stronger than beams (Figure 9.2).
Eq. (9.7) shows the ratio of bending moment capacities of columns and beams on the joint, where Mpc* is computed according to Eq. (9.8a) or Eq. (9.8b) and Mpb* is computed according to Eq. (9.9a) or Eq. (9.9b). If the reduced beam section is used the Eq. (9.9c) or Eq. (9.9d) must be used.
In the computation of column bending moment capacities, the required axial compressive force Pac (GKT) or Puc (YDKT) is obtained based on 9.3.1.3, which makes these bending moment capacities the smallest in accordance with the direction of the earthquake must be considered.
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