What are the critical considerations in precast concrete connection design?

Precast connection design considers: (1) Load path continuity for gravity, lateral, and volume change forces, (2) Ductility requirements for seismic zones - emulative (same as cast-in-place) or jointed (allowing controlled rocking), (3) Tolerances for fabrication and erection (typically +/-10-20mm), (4) Fire rating - protecting steel hardware, (5) Durability - corrosion protection for exposed elements, (6) Constructability - accessibility, sequence, temporary stability. Connection types include welded, bolted, grouted, and post-tensioned, each with specific design procedures and limitations.