Table 2 Basic values of the seismic reduction factor, R, for systems regular in elevation [17]
From: New definition for torsional irregularity based on floors rotations of reinforced concrete buildings
Structural type | DCM | DCH |
|---|---|---|
Frame system, dual system, coupled wall system | 3.0(αu/α1) | 4.5(αu/α1) |
Uncoupled wall system | 3.0 | 4.0(αu/α1) |
Torsionally flexible system | 2.0 | 3.0 |
Inverted pendulum system | 1.5 | 2.0 |