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Steel and Composite Structures Volume 59, Number 5, June 10 2026 , pages 609-629 DOI: https://doi.org/10.12989/scs.2026.59.5.609 |
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 open accessCoupled effects of corrosion and fault-crossing ground motions on continuous rigid frame bridges: Nonlinear dynamic response and failure mechanisms |
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Hongyu Jia, Jiahao Hou, Hao Bai, Zhi Xu, Kang Jia, Shixiong Zheng
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| Abstract | ||
| Bridges traversing active faults in aggressive environments (such as coastal or reservoir regions) face the coupled risks of chloride-induced corrosion and fault-crossing seismic excitations. The failure mechanisms governing continuous rigid frame bridges (CRFBs) under such coupled degradation-seismic conditions remain poorly understood. This study develops an integrated analytical framework comprising: (i) time-dependent deterioration models accounting for chloride-induced reinforcement section loss, yield-strength reduction, and concrete cover softening; and (ii) a refined 3D nonlinear finite element model (FEM) incorporating fiber beam column elements, a soil-structure interaction system (SSIS), bearings, and pounding effects. (iii) Synthetic fault crossing ground motions are generated by superimposing low-frequency fling-step pulses onto spectrum-matched high-frequency records. These synthetic motions are then applied to the bridge model via multi-support excitation. Comparative analyses demonstrate that fault-crossing motions shift the structural response from an inertia-dominated amplification mode to a quasi-static forced displacement mode. This mode shift imposes significantly larger and more asymmetric kinematic demands compared to standard near-fault scenarios. Structural responses exhibit a nonlinear dependence on permanent ground rupture displacement (PGRD), typically plateauing at an observed peak of 0. 6 m for the examined cases. This phenomenon is attributed to a force-limiting mechanism: the yielding of foundation soil and the premature plastic hinging of corroded piers restrict the inertial force transmission to the superstructure. Furthermore, the fault-crossing angle (FCA) governs the demand distribution, exhibiting an | ||
| Key Words | ||
| continuous rigid frame bridge; corrosion-induced degradation; fault-crossing ground motion; frequency decoupling; soil-structure interaction system | ||
| Address | ||
| Hongyu Jia:State Key Laboratory of Bridge Intelligent and Green Construction, Southwest Jiaotong University, Chengdu, 611756, Sichuan, China Jiahao Hou:School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China Hao Bai:Sichuan Expressway Construction & Development Group Co., Ltd., Chengdu, 610041, China Zhi Xu:Shudao Investment Group Co., Ltd., Chengdu, 610094, China Kang Jia:Sichuan Chengdu Construction Engineering Group Co., Ltd., Chengdu 610000, Sichuan, China Shixiong Zheng:1)State Key Laboratory of Bridge Intelligent and Green Construction, Southwest Jiaotong University, Chengdu, 611756, Sichuan, China 2)School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China | ||