Influence of axial loads and higher order modes on the seismic response of slender bridge piers

E. Tubaldi, L. Tassotti, A. Dall'Asta, L. Dezi

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

Abstract

A significant number of bridges is built on tall and slender piers in zones exposed to seismic hazard. The seismic behaviour of slender piers can be strongly influenced by higher modes contribution, related to the distributed pier mass, and also by second order effects, related to the interaction between axial loads and transverse seismic displacements. Although these latter effects may induce an increase or decrease of seismic demand, in current design practice they are usually taken into account by introducing amplification factors for the pier base moments evaluated by first-order analysis. This paper presents an analytical approach that permits to investigate efficiently and accurately the influence of both axial loads and higher order modes on the seismic behaviour of slender bridge piers. The proposed approach is based on a continuous pier model and on an analytical solution of the eigenvalue and seismic problem. The proposed analysis technique is applied to three case studies with different pier properties. The results show that the effects of axial loads and higher order modes can play different roles on the seismic response of slender bridge piers.

Original languageEnglish
Title of host publicationProceedings of the 9th International Conference on Structural Dynamics, EURODYN 2014
EditorsA. Cunha, P. Ribeiro, E. Caetano, G. Muller
Pages1347-1354
Number of pages8
Volume2014-January
ISBN (Electronic)9789727521654
Publication statusPublished - 2014
Event9th International Conference on Structural Dynamics, EURODYN 2014 - Porto, Portugal
Duration: 30 Jun 20142 Jul 2014

Conference

Conference9th International Conference on Structural Dynamics, EURODYN 2014
CountryPortugal
CityPorto
Period30/06/142/07/14

Keywords

  • axial load effects
  • bridges
  • eigenvalues
  • higher modes
  • seismic response
  • slender piers
  • structural dynamics
  • seismic design

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  • Cite this

    Tubaldi, E., Tassotti, L., Dall'Asta, A., & Dezi, L. (2014). Influence of axial loads and higher order modes on the seismic response of slender bridge piers. In A. Cunha, P. Ribeiro, E. Caetano, & G. Muller (Eds.), Proceedings of the 9th International Conference on Structural Dynamics, EURODYN 2014 (Vol. 2014-January, pp. 1347-1354)