A finite element model for seismic response analysis of deformable rocking frames

Vassiliou, Michalis F.; Mackie, Kevin R.; Stojadinović, Božidar

doi:10.1002/eqe.2799

Cited by 100 publications

(88 citation statements)

References 49 publications

(74 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above finding has been also confirmed experimentally by Drosos and Anastasopoulos (2014) and has been proven for non-symmetric rocking frames (Dimitrakopoulos and Giouvanidis, 2015). The same conclusion holds even when the column flexibility is taken into account (Acikgoz and DeJong, 2012;Vassiliou et al, 2014Vassiliou et al, , 2017a. Such behavior has been thoroughly examined both analytically and numerically, however, employing predominantly in-plane (2D) models.…”

Section: Rocking Piers Conceptsupporting

confidence: 54%

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

Agalianos

Psychari

Vassiliou

et al. 2017

Front. Built Environ.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Rocking Piers Conceptsupporting

confidence: 54%

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

Agalianos

Psychari

Vassiliou

et al. 2017

Front. Built Environ.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This dynamic property of rocking structures contributes very significantly to improving their seismic performance for downtime and repair cost performance objectives. This behavior, as well as the survival of ancient Greek and Roman temples (that are essentially rocking structures) in high seismicity areas [52][53][54][55] has led researchers to suggest the use of rocking as a seismic response modification technique [56][57][58][59][60][61][62][63][64][65][66][67][68].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Rigid Slab Supported by Four Rigid Cylinrical Rocking and Wobbling Columns

Rajah¹,

Bachmann²,

Vassiliou³

et al. 2017

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

View full text Add to dashboard Cite

show abstract

“…However, few computational models exist for modeling the response of deformable rocking bodies (e.g. [9], [10], [11], [12], [13], [14], [15], [16], [17]). Most of these studies, though, consider the rocking base to be rigid, take into account the stress nonlinearity only across the rocking interface or make simplifications regarding the stress distribution near the contact area.…”

Section: Introductionmentioning

confidence: 99%

A New Computational Approach for the Rocking Response of Deformable Bodies Considering Material Nonlinearity

Avgenakis¹,

Psycharis²

2017

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

View full text Add to dashboard Cite

Abstract. An increasing interest in the use of rocking members in earthquake resistant structural systems has been observed in recent years. The benefits of such members include the limitation of the damage, re-centering capabilities and reduction of seismic forces transmitted to the rest of the structure due to a yield-like response.Despite the importance of such members, few models able to describe the response of flexible rocking members in structural systems realistically can be found in literature, since most of the research focuses on the response of rigid bodies or ignores the stress nonlinearity near the contact area, which is considered crucial to the accurate determination of the rocking response of deformable rocking bodies. A new macro-element formulation for elastic rocking members has been proposed by the authors in previous papers which is able to take into account this stress nonlinearity, producing results which are very close to the ones produced by conventional finite element programs.Rocking members in structural systems are expected to behave inelastically for large seismic excitations. In this paper, the macroelement presented previously by the authors, which considered the element material to be elastic, is extended to also take material nonlinearity into account. The effect of the nonlinear stress distribution across the rocking interface on the member displacements is determined and approximate formulas for their determination are included in the macro-element formulation. The results produced by the macro-element with the inelastic material are finally compared to the ones of conventional finite element codes, showing very good agreement between the results of the two methods.

show abstract

A finite element model for seismic response analysis of deformable rocking frames

Cited by 100 publications

References 49 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

Dynamic Response of a Rigid Slab Supported by Four Rigid Cylinrical Rocking and Wobbling Columns

A New Computational Approach for the Rocking Response of Deformable Bodies Considering Material Nonlinearity

Contact Info

Product

Resources

About