Static And Dynamic Behavior Of Unbonded Elastomeric Bridge Bearings

Domaniç, Arman
Caner, Alp
A positive connection between superstructure and substructure in vertical or horizontal directions cannot be achieved by use of unbonded elastomeric bearings. The horizontal connection of unbonded bearings to the structure is furnished thru friction at contact surfaces while gravitational forces are utilized to maintain contact in vertical direction. An approximate horizontal friction coefficient of 0.20 is typically used at contact surfaces in seismic design based on practice in Turkey. The aim of this study is to identify the static and dynamic characteristics of these unbonded bearings thru an experimental program. In this scope, about a half scale bridge, having a 12 m span length with a 3.5 meter wide concrete deck on three steel I-beams, was constructed on a shake table. Static response of bearings was measured using a combined compression-shear bearing test machine. The experimental results indicated that bonded and unbonded bearings exhibited a similar seismic performance when excited to the same earthquake record. Use of a horizontal friction coefficient of 0.20 in seismic analysis can yield to underestimation of substructure design forces and significant overestimation of seismic displacement demands. A comprehensive parametric study was performed to identify dynamic response of similar simple-span bridges in terms of deck displacements and bearing shear forces.
Ibridge 2016 (8 - 10 Ağustos 2016)


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Citation Formats
A. Domaniç and A. Caner, “Static And Dynamic Behavior Of Unbonded Elastomeric Bridge Bearings,” İstanbul, Türkiye, 2016, p. 125, Accessed: 00, 2021. [Online]. Available: