Preliminary design of seismically isolated R/C highway overpasses- Features of relevant software and experimental testing of elastomeric bearings

George C. Manos*, Stergios A. Mitoulis, Anastasios G. Sextos

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

5 Citations (Scopus)

Abstract

The preliminary design of seismically isolated R/C highway overpasses is the tar-get of a software based on the current design provisions of Eurocode 8 (Part 2) as well as on engineering decisions included in the expert system. The features of this expert system, which is aimed to facilitate the design of a highway overpass by isolating its deck with the inclusion of elastomeric bearings, are presented and discussed. For such an upgrade scheme a number of successive checks is necessary in order to select an optimum geometry of the bearings. The developed software includes a series of checks provided by Eurocode 8 (Part 2), in order to ensure the satisfactory seismic performance of the selected upgrade scheme. In doing so, the software accesses a specially created database of the geometrical and mechanical character-istics of either cylindrical or prismatic elastometallic bearings which are commercially avail-able; this database can be easily enriched by relevant data from laboratory tests on isolation devices. The basic assumptions included in the software are (a) modeling the seismic re-sponse of the bridge overpass as a SDOF system, and (b) only the longitudinal direction re-sponse is considered; it is common practice for seismically isolated bridge systems to restrain the transverse movement of the deck by stoppers. Moreover, the results form a number of tests performed in the Laboratory of Strength of Materials and Structures of Aristotle Univer-sity, verified the quality of the production process of a local producer of elastomeric bearings subjecting production samples to the sequence of tests specified by International Standard ISO 22762-1 (2005). Strain amplitudes larger than 250% resulted in the debonding of the elastomer from the steel plating. Artificial aging resulted in a small increase of the axial (ver-tical) stiffness and a small decrease of the shear (horizontal) stiffness of the tested bearings. More specimens must be tested to validate further these findings.

Original languageEnglish
Title of host publicationECCOMAS Thematic Conference - COMPDYN 2011: 3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering: An IACM Special Interest Conference, Programme
Publication statusPublished - 2011
Event3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2011 - Corfu, Greece
Duration: 25 May 201128 May 2011

Conference

Conference3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2011
CountryGreece
CityCorfu
Period25/05/1128/05/11

Keywords

  • Bridges
  • Knowledge-based systems
  • Preliminary de-sign
  • Seismic isolation
  • Software
  • Testing of elastomeric bearings

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