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Seismic response of helical pile-supported bridge in liquefiable site
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DOI：10.1016/j.soildyn.2026.110462.png)
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Abstract
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• A validated 3D finite element model is established for helical pile (HP) supported bridges in inclined liquefied sites, verified by shaking table test data. • HPs exhibit superior seismic performance to reinforced concrete piles in liquefiable sites, effectively suppressing soil deformation, improving soil-pile interaction and reducing overall structural deformation of bridges. • Helix parameters significantly affect seismic performance, with the optimal configuration being 2-3 blades, a blade diameter of 2-3 times the pile shaft diameter (d), and a blade spacing of 2-4 times d. • Excessively large helix spacing and unreasonable positioning near liquefiable layers weaken the anchoring effect of HPs and cause increased structural deformation. • Properly configured HPs drastically reduce bridge structural deformation, providing a novel and feasible seismic reinforcement approach for bridges in liquefaction-prone areas.
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