Table 1: Rotation capacities for coupling beams controlled by flexure as per FEMA 273 [14] and FEMA 356 [15].

Type of coupling beamConditionsPlastic Rotation Capacity (Radians)
IOLSCP

Conventional longitudinal reinforcement with conforming transverse reinforcement
30.0060.0150.025
60.0050.0100.015
Conventional longitudinal reinforcement with non-conforming transverse reinforcement 30.0060.0120.020
60.0050.0080.010
Diagonal ReinforcementNA0.0060.0180.030
Flexure dominant steel coupling beam and
and