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State-dependent seismic evaluation and fragility analysis of vaulted bi-layered reticulated spatial shells
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DOI：10.1016/j.engstruct.2026.123532.png)
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Abstract
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• State-dependent fragility methods quantify stability and collapse risk of vaulted bi-layered reticulated shells. • FEMA P-695-compliant IDAs reveal collapse acceleration is highly sensitive to span length and roof height-to-span ratio. • Pinching4 simulations capture brittle response; height-to-span ratios >0.15 cause wall-like behavior and abrupt instability. • Hybrid framework uses drift ratios and Park–Ang damage index to define occupancy, life safety, and collapse thresholds. • Damage index fragilities predict more conservative demand than drift limits, reflecting shell brittleness and aiding design.
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