The rocking response of large flexible structures to earthquakes

Acikgoz, Sinan; DeJong, Matthew J.

doi:10.1007/s10518-013-9538-0

Cited by 68 publications

(84 citation statements)

References 31 publications

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“…The maximum displacement δxy (along any direction) is plotted vs the PGV of the ground motion. The optimal choice of an earthquake ground motion IM for rocking systems is an open research subject Acikgoz and DeJong, 2014;Dimitrakopoulos and Paraskeva, 2015;Kavvadias et al, 2017;Petrone et al, 2017). The selection of an optimal IM does not fall within the scope of this paper, and PGV is used indicatively without further discussion.…”

Section: Rocking Footingsmentioning

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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Section: Rocking Footingsmentioning

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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“…For the assessment of the seismic reliability of a structure we can use either natural/historic records (e.g., [16]) or synthetic ground motions (e.g., [15]). In the present study, we employ a stochastic synthetic ground motion model [17][18][19].…”

Section: Stochastic Model For Near-fault Ground Motionsmentioning

confidence: 99%

“…Its particular goal is to assess the seismic reliability of (negative stiffness) rocking structures to near-fault excitations. In this context, it integrates two different components: (i) a 'universal' description of rocking response from [2] and (ii) a probabilistic framework, from recent studies of Psycharis et al [15] and Acikgoz and DeJong [16]. This work brings forward the different sensitivity of rocking response to excitations with low versus high amplitude.…”

Section: Introductionmentioning

confidence: 99%

Seismic Reliability Assessment of Rocking Behaviour Under Near-Fault Excitations

Dimitrakopoulos¹,

Paraskeva²

2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Structures idealized as rigid rocking blocks were studied by Housner [3] back in the 1960s. Since then, the overturning tendency and self-centering nature of rocking [4,5], the implementation of rocking with dampers to suppress swaying motion [6][7][8][9][10][11][12][13][14][15], the coupling of flexibility and rocking, [16][17][18][19] and the role of the higher modes [17,18,20,21] have been studied both from an experimental and analytical point of view, with a clear focus on the structural performance (structural rocking). In practice, while the base shear reduces due to structural rocking, excitation due to impacts at the interface of the stepping mechanism might amplify internal loads significantly.…”

Section: Introductionmentioning

confidence: 99%

A Centrifuge Investigation of Two Different Soil-Structure Systems With Rocking and Sliding on Dense Sand

Pelekis¹,

Madabhushi²,

Jong³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The rocking response of large flexible structures to earthquakes

Cited by 68 publications

References 31 publications

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

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

Seismic Reliability Assessment of Rocking Behaviour Under Near-Fault Excitations

A Centrifuge Investigation of Two Different Soil-Structure Systems With Rocking and Sliding on Dense Sand

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