Design of isolated bridges for adaptive seismic performance using gapped hysteretic damper connections

2018-08-03
Hysteretic dampers in bridges with seismically isolated decks are usually coupled with shock transmitters in order to prevent their engagement during thermal displacements of the deck. An alternative design approach is presented in this paper where the dampers are attached to the deck using elongated holes (gaps) which are sized to accommodate the thermal displacements and hence to keep the dampers from being activated during thermal displacements. The gaps are sized based on the expected maximum thermal displacement in each pier. The gap length will thus be different for different piers. With this arrangement, number of the dampers engaged during an earthquake will depend on the magnitude of displacements. The distinct feature in this design is: (i) preventing the engagement of dampers under thermal displacements during service life without using shock transmitters and (ii) sequential engagement of dampers as a function of magnitude of seismically-induced displacements. This paper presents a sample application of this methodology in design of a major viaduct. The performance goals of the bridge require no damage at 475-year return period earthquake and repairable damage at 2475-year return period earthquake. The bridge is designed with a seismic isolation system composed of spherical bearings and hysteretic dampers (Multidirectional torsional hysteretic damper (MTHD)). Design features of this seismically isolated bridge and results of nonlinear time-history analyses are presented in this paper.

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Citation Formats
M. Dicleli, “Design of isolated bridges for adaptive seismic performance using gapped hysteretic damper connections,” presented at the Design of isolated bridges for adaptive seismic performance using gapped hysteretic damper connections, 10th International Conference on Short and Medium Span Bridges, Quebec, Kanada, 31 Temmuz - 03 Ağustos 2018, Quebec, Kanada, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/82674.