Antiseismic design of viaducts SG25, SG27 and SG28 in the high speed railway line Athens-Thessaloniki

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Title: Antiseismic design of viaducts SG25, SG27 and SG28 in the high speed railway line Athens-Thessaloniki

Author(s): Santamaría Caballero, G.; Izquierdo López, D.; Martín Nieto, C.; Abad González, I.

Publication: ACHE

Volume: 64

Issue: 267

Appears on pages(s): 41 - 59

Keywords: earthquake, isolation, pendulum, damper, non-linearity.

Date: 1/1/2013

Abstract:
The Lianokladi-Domokos Section of the New Double Track High Speed Railway Line between Athens and Thessaloniki includes some postensioned concrete box girder bridges. The structures SG25 y SG28 were incrementally launched from one abutment and the structure SG27 was built following a span-by-span construction on conventional falsework.Due to the high seismicity of the area (ac = 0,39 g), an isolation-damping strategy has been adopted by means of various anti-seismic devices on piers and abutments: elastomeric bearings, spherical bearings (guided or fixed), pendulum bearings and shock transmitters-dampers (transversal and longitudinal). Thus, seismic energy input is reduced whilst damping limits deck movements. A complete dynamic non-linear time-history was conducted, applying seven pairs of real accelerograms to the models of the bridges.


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