The Seismic Responses Of K8Single-layer Reticulated Domes With Substructures Under Multi-support Excitations

Reticulated shell has a lot applications in sports stadiums, exhibition centers and industrial plants because it has a series of advantages, such as light deadweight and better structural stiffness and the span increases gradually, such as Nagoya Dome, the diameter of the roof which is supported on the frame column on stands reaches187.2m?Earthquakes are one of the main possible dynamic effects that structures may undergo in service period, there are spatial variations when the motions reach the structures after long-distance transmission, due to effects of wave passage, coherence, site and attenuation. So it is more actual to consider spatial correlation effects multi-support excitation than single support excitation. This article integrate the existing better earthquake ground motion models to simulate earthquake ground motion which consider coherence effect and traveling-wave effect. Take spectral representation of the trigonometric series to simulate seismic ground motions. The coherence function model suitable for this article, which was derived by Zeng Qinglong was used. The Du-Chen Model was chosen as the target power spectrum. The Thráinsson and Kremidjian Model was used as the phase difference spectrum. Build the single-layer reticulated domes model with substructures and non-substrutures. The time-history responses of the model under multi-support excitations and uniform support excitations in horizontal X, vertical Y and three directions were analysed. The results show that spatial coherence has remarkable influence on reticulated shell, especially the circle members, when on no consideration of substructure. Axial force under three-dimensional multi-support excitations is much larger than that under three-dimensional uniform excitations. It is more actual to consider spatial correlation effects multi-support excitation when carrying out seismic calculation. The influence of substructures on single-layer reticulated domes was discussed. Calculate the influence of5different substructures on120m span single-layer reticulated domes under multiple-support excitations and uniform excitations.