Seismic responses of lattice domes with substructures are known to be very complicate, because of the dome having large numbers of parallel vibration modes, and their amplitude changing drastically along the relationship between domes and substructures. Under limited condition, however, their response characteristics are considered to become relatively simple. In this paper, various shapes of domes are analyzed using response spectrum analyses with CQC method, which is less time-consuming than time-history analyses. The conditions for simplifying the principal modes are made clear through these studies, and their response characteristics are discussed.
