When screening vertical stiffness discontinuities across adjacent stories under seismic irregularity clauses, what ratio best guides engineering judgement?
Choices
- (A) Concrete volume ratio only
- (B) Visual storey drift anecdotes
- (C) Storey shear stiffness ratio per code irregularity thresholds
- (D) Equal diaphragm tributary weight alone
Correct answer: (C)
Storey shear stiffness ratio per code irregularity thresholds
Explanation
Soft-floor stiffness imbalance draws inelastic drift.