Table 11: Modified Parameters governing the coupling beam characteristics controlled by shear.

Type of coupling beamShear Span to Depth Ratio Type of detailingPlastic Rotation Capacity (Radians)
CP

Reinforced concrete coupling beam No limitConventional longitudinal reinforcement with conforming transverse reinforcement 30.015
60.010
1.5Diagonal Reinforcement (strength is an overriding consideration and thickness of wall should be greater than 406.4 mm) 0.03
1.5 to 4.0Truss Reinforcement (additional experimentation is required)0.03–0.08
Steel coupling beam Shear dominant