Probabilistic Seismic Response and Reliability Assessment of Tunnel-Type Anchorage in Suspension Bridges Under Non-Stationary Seismic Excitation

Tunnel-type anchorages (TTAs) are used in suspension bridges, but their seismic reliability remains unclear. This study assesses the Puli Bridge anchorage. Thirty nonstationary artificial motions were generated, with three-dimensional response histories retained for 15. For each motion, responses at 17 monitoring points were averaged within front, middle, and rear sections, and their absolute peaks were analyzed probabilistically. At the pooled-Q75 threshold, exceedance proportions were 0.20, 0.00, and 0.60, respectively. No displacement exceeded the 62.8 mm serviceability reference. The rear section merits closer monitoring, although interpretation is limited by sample size, equal-weight averaging, service-level excitation, and deterministic model parameters.