A parametric study on the axial behaviour of elastomeric isolators in multi-span bridges subjected to horizontal seismic excitations

E. Tubaldi, S. A. Mitoulis, H. Ahmadi, A. Muhr

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

This paper investigates the potential tensile loads and buckling effects on rubber-steel laminated bearings on bridges. These isolation bearings are typically used to support the deck on the piers and the abutments and reduce the effects of seismic loads and thermal effects on bridges. When positive means of fixing of the bearings to the deck and substructures are provided using bolts, the isolators are exposed to the possibility of tensile loads that may not meet the code limits. The uplift potential is increased when the bearings are placed eccentrically with respect to the pier axis such as in multi-span simply supported bridge decks. This particular isolator configuration may also result in excessive compressive loads, leading to bearing buckling or in the attainment of other unfavourable limit states for the bearings. In this paper, an extended computer-aided study is conducted on typical isolated bridge systems with multi-span simply-supported deck spans, showing that elastomeric bearings might undergo tensile stresses or exhibit buckling effects under certain design situations. It is shown that these unfavourable conditions can be avoided with the rational design of the bearing properties and in particular of the shape factor, which is the geometrical parameter controlling the axial bearing stiffness and capacity for a given shear stiffness. Alternatively, the unfavourable conditions could be reduced by reducing the flexural stiffness of the continuity slab.

LanguageEnglish
Pages1285-1310
Number of pages26
JournalBulletin of Earthquake Engineering
Volume14
Issue number4
Early online date19 Feb 2016
DOIs
Publication statusPublished - 1 Apr 2016

Fingerprint

Bearings (structural)
isolators
buckling
stiffness
pier
excitation
wharves
Buckling
tensile stress
bolt
Piers
rubber
temperature effect
Stiffness
slab
uplift
steel
bolts
Bridge decks
Bolts

Keywords

  • bridges
  • buckling
  • seismic isolation
  • shape factor
  • steel-laminated elastomeric bearings
  • tensile stress

Cite this

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abstract = "This paper investigates the potential tensile loads and buckling effects on rubber-steel laminated bearings on bridges. These isolation bearings are typically used to support the deck on the piers and the abutments and reduce the effects of seismic loads and thermal effects on bridges. When positive means of fixing of the bearings to the deck and substructures are provided using bolts, the isolators are exposed to the possibility of tensile loads that may not meet the code limits. The uplift potential is increased when the bearings are placed eccentrically with respect to the pier axis such as in multi-span simply supported bridge decks. This particular isolator configuration may also result in excessive compressive loads, leading to bearing buckling or in the attainment of other unfavourable limit states for the bearings. In this paper, an extended computer-aided study is conducted on typical isolated bridge systems with multi-span simply-supported deck spans, showing that elastomeric bearings might undergo tensile stresses or exhibit buckling effects under certain design situations. It is shown that these unfavourable conditions can be avoided with the rational design of the bearing properties and in particular of the shape factor, which is the geometrical parameter controlling the axial bearing stiffness and capacity for a given shear stiffness. Alternatively, the unfavourable conditions could be reduced by reducing the flexural stiffness of the continuity slab.",
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A parametric study on the axial behaviour of elastomeric isolators in multi-span bridges subjected to horizontal seismic excitations. / Tubaldi, E.; Mitoulis, S. A.; Ahmadi, H.; Muhr, A.

In: Bulletin of Earthquake Engineering, Vol. 14, No. 4, 01.04.2016, p. 1285-1310.

Research output: Contribution to journalArticle

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