SEISMIC RESILIENCE ASSESSMENT OF A SINGLE-LAYER RETICULATED DOME DURING CONSTRUCTION

The seismic bearing capacity of an incomplete single-layer reticulated dome during construction is significantly lower than that of a complete dome. To assess the seismic resilience of incomplete single-layer reticulated domes and find the most unfavorable construction stage, a new curve of recovery functionality and a new methodology of seismic resilience during construction were established in this study. Under the combined action of the bending moment and axial force, the damage state criterion of circular steel pipes was improved through hysteresis simulation analysis. Based on the elastoplastic time -history analysis of different construction models, the damage state levels of all structural members were employed to estimate the functionality loss after an earthquake event. The repair path and the repair time of damaged steel pipes were defined, and the structural recovery functionality was computed to assess the seismic resilience. The proposed methodology in this paper was demonstrated using a 40-meter span of the Kiewitt-8 dome with six circular grids considering both the construction process and seismic hazards. The results indicate that seismic resilience is related to the incomplete structural form of the dome during construction. The repair time will be the longest and the seismic resilience will be the lowest if the incomplete dome suffers an earthquake during the construction period when installing the fourth circular grid from outside to inside.Copyright (c) 2023 by The Hong Kong Institute of Steel Construction. All rights reserved.