Quantifying Easy-to-Repair Displacement Ductility and Lateral Strength of Scoured Bridge Pile Group Foundations in Cohesionless Soils: A Classification–Regression Combination Surrogate Model

Scoured pile-group foundations in bridges are likely to undergo inelastic deformation during earthquakes, which can be utilized to dissipate seismic energy and withstand seismic loads by the post-yield hardening strength of the foundation. However, limit states and associated ductility indices and post-yield strength indices are yet to be well documented. This study develops a surrogate model, namely, the classification–regression combination model (CRCM), for the efficient, interpretable, and high-confidence quantification of displacement ductility factor(μΔER) and associated strength hardening factor(RFER) of scoured bridge pile-group foundations at the easy-to-repair limit state, where the damage of piles is limited to the aboveground region (thereby being relatively easy to repair). To this end, a proper pushover method from those with different load patterns is first identified for efficient nonlinear analyses of scoured bridge pile groups. A large number of bridge samples are then analyzed to prepare a comprehensive database for the development of CRCM, which first classifies the failure process of scoured bridge pile-group foundations and then regresses μΔER and RFER with variables characterizing the soil–bridge systems. It is found that the pushover method with a two-node load pattern (i.e., load at the superstructure and pile-cap centroids) can very well capture μΔER and RFER and the failure process of bridge pile groups. The data-driven CRCM can efficiently provide reasonable predictions of μΔER and RFER with errors mostly within 20%; it is specifically compared with a regression-only model to demonstrate the necessity of incorporating a classifier in advance of the regression model.

• Record URL:
  • https://doi.org/10.1061/JBENF2.BEENG-6201
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/32947845
• Supplemental Notes:
  • © 2023 American Society of Civil Engineers.
• Authors:
  • Wang, Jingcheng
  • Ye, Aijun
  • Wang, Xiaowei
• Publication Date: 2023-11

Language

• English

Media Info

• Media Type: Web
• Pagination: 04023080
• Serial:
  • Journal of Bridge Engineering
  • Volume: 28
  • Issue Number: 11
  • Publisher: American Society of Civil Engineers
  • ISSN: 1084-0702
  • Serial URL: http://ojps.aip.org/beo

Subject/Index Terms

• TRT Terms: Bridge foundations; Ductility tests; Earthquake resistant design; Scour; Soil structure interaction; Support piles
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 01896153
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Oct 16 2023 9:33AM