Pulse-like near-fault ground motion effects on the ductility requirement of bridge bents

Ajit C. Khanse, Eric M. Lui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper discusses the ductility requirement for a typical bridge pier or bent subjected to extreme loads such as those from pulse-like near-fault ground motions. The ductility requirement as stated by prevailing design codes may not be valid for such structures in near-fault (less than 10 miles) zones. Due to dominance of the pulses, medium to long period structures are highly affected; often resulting in high residual or permanent deformations after the cessation of seismic ground motions. As per most design codes, the magnitude of displacements associated with P-Delta effects is required to be captured using non-linear time history analysis. The higher the value of the target displacement ductility demand or the P-Delta ratio, the larger is the magnitude of the residual displacements. Because permanent deformations in a bridge bent would lead to a higher eccentric loading from the superstructure, the bent would be subjected to higher secondary moments from it own design load. A suitable balance should therefore be made between ductility and residual displacements in the design of such structures using Performance-Based Seismic Design procedures.

Original languageEnglish (US)
Title of host publicationTCLEE 2009
Subtitle of host publicationLifeline Earthquake Engineering in a Multihazard Environment
Number of pages1
DOIs
StatePublished - Nov 24 2009
Event2009 ASCE Technical Council on Lifeline Earthquake Engineering Conference, TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment - Oakland, CA, United States
Duration: Jun 28 2009Jul 1 2009

Publication series

NameTCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment
Volume357

Other

Other2009 ASCE Technical Council on Lifeline Earthquake Engineering Conference, TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment
CountryUnited States
CityOakland, CA
Period6/28/097/1/09

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Keywords

  • Bridges
  • Displacement
  • Ductility
  • Earthquakes
  • Ground motion
  • Piers
  • Seismic design

ASJC Scopus subject areas

  • Geophysics
  • Geotechnical Engineering and Engineering Geology

Cite this

Khanse, A. C., & Lui, E. M. (2009). Pulse-like near-fault ground motion effects on the ductility requirement of bridge bents. In TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment (TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment; Vol. 357). https://doi.org/10.1061/41050(357)12