Study on Seismic Performance of Continuous T-Beam Bridge—Kulungou Bridge

The objective of this research is to assess the seismic behavior of the continuous T-beam bridge located at Kulungou in Xinjiang. In addition to traditional static and modal analyses, this study introduces a novel approach by comprehensively examining the performance of the bridge during construction stages, under ultimate load capacities and seismic load. Compliance with regulatory standards is verified by the static analysis, which also yields a thorough comprehension of stress distribution across various stages of construction. By unveiling the initial 100 vibration modes, the modal analysis has significantly enhanced our comprehension and established a robust basis for the ensuing seismic analysis. A distinctive aspect of this research is its comprehensive exploration of the bridge’s seismic behavior under E1 and E2 earthquake excitations. Under E1 earthquake excitation, the response spectrum analysis confirms the adequacy of the bridge piers’ strength according to seismic design criteria, whereas the time-history analysis conducted under E2 ground motion reveals the bridge’s robust resistance to strong earthquakes. This study also undertakes a comparative assessment of the seismic behavior of the bridge, contrasting its performance with lead-rubber bearings against that with high-damping rubber bearings. According to the study’s findings, both types of bearings demonstrate their efficacy in mitigating seismic responses, thereby emphasizing their potential as innovative approaches to enhance the resilience of bridges. A notable contribution of this research lies in its assessment of seismic performance indicators, namely hysteresis curves, backbone curves, and ductility coefficients, utilizing Pushover analysis. By conducting a thorough evaluation, a more profound insight into the seismic performance of bridge piers is gained. In conclusion, the study explores how earthquake wave intensity and aftershocks affect the seismic response of bridge piers, showing a substantial increase in seismic response with intensifying wave magnitude and the potential for aftershocks to aggravate damage to compromised structures. The importance of incorporating these factors in the seismic design and retrofitting of bridges is underscored by these discoveries. This study, in its entirety, proposes a fresh and comprehensive methodology to assess the seismic performance of continuous T-beam bridges, furnishing valuable perspectives and innovative remedies to augment the seismic resilience of bridges in earthquake-prone zones.