What are the special considerations for analyzing long-span roof structures?

Long-span roof analysis requires: (1) Large displacement geometric nonlinearity as shallow structures can undergo significant deformation, (2) Stability analysis for snap-through buckling in shallow domes/arches, (3) Dynamic effects from wind gusts and vibrations, (4) Temperature effects causing significant movement, (5) Construction sequence analysis as partially completed structure may have different behavior, (6) Cable/membrane pretension effects in tension structures. Analysis must consider pattern loading, unbalanced loads, and ponding instability for flat roofs.