Why offset mass and stiffness centres in plan irregular buildings raise coupled lateral‑torsional seismic effects?

Choices

• (A) Eccentricities never couple with shear demand
• (B) Eccentric inertia arms apply torque diaphragms stacking with lateral shears
• (C) Only aligns wind centroid never seismic mass
• (D) Eliminates need for diaphragm chord design