Seismic analysis of motorway bridges accounting for key structural components and nonlinear soil–structure interaction

Anastasopoulos, Ioannis; Sakellariadis, Lampros; Agalianos, Athanasios

doi:10.1016/j.soildyn.2015.06.016

Cited by 30 publications

(24 citation statements)

References 16 publications

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“…Soil-structure interaction (SSI) may have a significant effect on the seismic damage of a bridge, and should be taken into account. Such a simplified method accounting for SSI is presented in Anastasopoulos et al [2015].…”

Section: Overview Of the Rare Systemmentioning

confidence: 99%

Simple method for real-time seismic damage assessment of bridges

Anastasopoulos

Agalianos

et al. 2015

Soil Dynamics and Earthquake Engineering

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Section: Overview Of the Rare Systemmentioning

confidence: 99%

Simple method for real-time seismic damage assessment of bridges

Anastasopoulos

Agalianos

et al. 2015

Soil Dynamics and Earthquake Engineering

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“…In Anastasopoulos et al, 7 the validity of the simplified model was confirmed using 30 real records as seismic excitation, covering a wide range of intensities and kinematic characteristics. The efficiency of the simplified modelling technique was shown to be insensitive to record selection.…”

Section: Outline and Key Assumptionsmentioning

confidence: 85%

“…For the interfaces between the retaining wall and the embankment, a maximum shear capacity of 0.5S u is considered in the case of a cohesive embankment Powrie. 7,18 Initially, the effect of abutment stoppers of negligible clearance is examined. A reinforced-earth embankment is considered, as it is quite common for such motorway bridges; it is modelled in a simple manner, applying kinematic constraints in the transverse direction.…”

Section: Effect Of Abutment Stoppersmentioning

confidence: 99%

“…The deck is monolithically connected to piers P3 and P4, but is sitting on a pair of sliding bearings (acting only in the longitudinal direction) at piers P1 and P2. Since the response of the piers is different, in such asymmetric cases, the selection of the critical pier is not as straightforward as for the symmetric systems examined in Anastasopoulos et al 7 The next section highlights a simplified procedure to identify the critical pier, with the aim of extending the simplified modelling approach to such asymmetric bridge systems. This design aims to accommodate temperature effects, by allowing displacement in the longitudinal direction, mobilizing at the same time the resistance of all piers in the transverse direction to improve seismic performance.…”

Section: Verification For Nonideally Symmetric Systemsmentioning

confidence: 99%

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Simplified method for real‐time seismic damage assessment of motorway bridges: Transverse direction—Accounting for abutment stoppers

Sakellariadis

Agalianos

Anastasopoulos

2018

Earthq Engng Struct Dyn

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Summary In the context of developing a real‐time seismic damage assessment technique, this paper proposes a simplified model that accounts for abutment stoppers, focusing on the transverse direction. Detailed 3D finite element models of 4 bridges of the Attiki Odos motorway are developed and used as benchmarks to assess its efficiency. The selected bridges vary in length, pier typologies, clearances, and pier‐deck connections. The simplified model entails a SDOF system of a pier, with assemblies of gap elements, lateral and rotational springs, and dashpots (top and bottom), representing the deck, the bearings, the abutment stoppers, and the foundation. The effect of stoppers is initially studied, focusing on the response of the abutment‐embankment system. To shed more light on the role of abutment stoppers, a parametric study is conducted, considering a wide range of clearances. Subsequently, the effect of variabilities in span length and pier height is examined. The simplified method is extended to nonideally symmetric systems and verified against the 3D benchmarks. Finally, the model is modified to account for multicolumn piers. The extended simplified model offers a reasonable prediction of the seismic damage state, reducing significantly the computational cost, and allowing detailed parametric studies. The latter are used to develop nonlinear regression model equations correlating a selected damage index with statistically significant intensity measures. Such equations offer a viable alternative for network‐wide seismic damage assessment as part of a real‐time emergency response framework. A pilot implementation is presented, illustrating the applicability of the proposed methodology.

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“…The seismic excitation is applied at the base of the model. More details on the development of the rigorous model can be found in the study by Anastasopoulos et al (2011Anastasopoulos et al ( , 2015.…”

Section: Conventional Systemmentioning

confidence: 99%

Comparative Assessment of Two Rocking Isolation Techniques for a Motorway Overpass Bridge

Agalianos

Psychari

Vassiliou

et al. 2017

Front. Built Environ.

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Rocking isolation of structures is evolving as an alternative design concept in earthquake engineering. The present paper investigates the seismic performance of an actual overpass bridge of the Attiki Odos motorway (Athens, Greece), employing two different concepts of rocking isolation: (a) rocking of the piers on the foundation (rocking piers); and (b) rocking of the pier and foundation assembly (rocking footings) on the soil. The examined bridge is an asymmetric 5-span system having a continuous deck and founded on surface foundations on a deep clay layer. The seismic performance of the two rocking-isolated bridges is comparatively assessed to the existing bridge, which is conventionally designed according to current seismic design codes. To that end, 3D numerical models of the bridge-foundation-abutment-soil system are developed, and both static pushover and non-linear dynamic time history analyses are performed. For the latter, an ensemble of 20 records (10 ground motions of 2 perpendicular components each) that exceed the design level are selected. The conventional system collapses in 5/10 of the (intentionally severe) examined seismic excitations. The rocking piers design alternative survives in 8/10 of the cases examined, with negligible residual deformations. The safety margins of the rocking footings design concept are even larger, as it survives in all cases examined. Both rocking isolation concepts are proven to offer increased levels of seismic resilience, reducing the probability of collapse and the degree of structural damage. Nevertheless, in the rocking piers design alternative high stress concentrations at the rotation pole (pier base) are developed, indicating the need for a special design of the pier ends. This is not the case for the rocking footings concept, which however is subject to increased residual settlements but no residual rotations.

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Seismic analysis of motorway bridges accounting for key structural components and nonlinear soil–structure interaction

Cited by 30 publications

References 16 publications

Simple method for real-time seismic damage assessment of bridges

Simple method for real-time seismic damage assessment of bridges

Simplified method for real‐time seismic damage assessment of motorway bridges: Transverse direction—Accounting for abutment stoppers

Comparative Assessment of Two Rocking Isolation Techniques for a Motorway Overpass Bridge

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