Displacement limits and performance displacement profiles in support of direct displacement‐based seismic assessment of bridges

Cardone, Donatello

doi:10.1002/eqe.2396

Cited by 44 publications

(35 citation statements)

References 24 publications

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“…Numerous analysis methods were proposed for demand evaluation, covering a range of levels of complexity and computational cost. In particular, elastic response spectrum analysis and inelastic pushover analysis of a detailed inelastic model , or a simplified single‐degree‐of‐freedom model (e.g. capacity spectrum method ) are common options.…”

Section: Introductionmentioning

confidence: 99%

Methodology for the development of bridge‐specific fragility curves

Paraskevopoulos

Kappos

2016

Earthq Engng Struct Dyn

119

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Summary A new methodology for the development of bridge‐specific fragility curves is proposed with a view to improving the reliability of loss assessment in road networks and prioritising retrofit of the bridge stock. The key features of the proposed methodology are the explicit definition of critical limit state thresholds for individual bridge components, with consideration of the effect of varying geometry, material properties, reinforcement and loading patterns on the component capacity; the methodology also includes the quantification of uncertainty in capacity, demand and damage state definition. Advanced analysis methods and tools (nonlinear static analysis and incremental dynamic response history analysis) are used for bridge component capacity and demand estimation, while reduced sampling techniques are used for uncertainty treatment. Whereas uncertainty in both capacity and demand is estimated from nonlinear analysis of detailed inelastic models, in practical application to bridge stocks, the demand is estimated through a standard response spectrum analysis of a simplified elastic model of the bridge. The simplified methodology can be efficiently applied to a large number of bridges (with different characteristics) within a road network, by means of an ad hoc developed software involving the use of a generic (elastic) bridge model, which derives bridge‐specific fragility curves. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Methodology for the development of bridge‐specific fragility curves

Paraskevopoulos

Kappos

2016

Earthq Engng Struct Dyn

119

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“…(1), where the allowable curvature (φ ls ), the yield curvature (φ y ) and the plastic hinge length are estimated using empirical equations and diagrams (e.g. Kowalsky 2000, Priestley et al 2007, Biskinis & Fardis 2010, Cardone 2014. The equivalent cantilever height (h eq ) (the length from the critical section to the point of contraflexure, i.e.…”

Section: A Deformation-based Design Procedures For Bridgesmentioning

confidence: 99%

“…curvature and/or chord rotation ductility factors) and/or displacement, based on the results of the M-φ analysis of pier columns, and the h eq taken as the mean of the relevant response quantities observed during the nonlinear dynamic analyses. Regarding bearings and in particular the usual type of bolted elastomeric bearings, the deformation limit associated with a functionality level could be set, in terms of bearing strain, between 0.5 and 1.5 (Padgett 2007, Moschonas et al 2009, Cardone 2014. Moreover, the width of joints (in modern bridges normally located solely at the abutments, except for very long decks with intermediate joints) should be selected such that they remain open under this level of seismic action, to avoid damage at the backwalls.…”

Section: A Deformation-based Design Procedures For Bridgesmentioning

confidence: 99%

Deformation-based seismic design of concrete bridges

Gkatzogias¹,

Kappos²

2015

Earthquakes and Structures

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Abstract.A performance-based design (PBD) procedure, initially proposed for the seismic design of buildings, is tailored herein to the structural configurations commonly adopted in bridges. It aims at the efficient design of bridges for multiple performance levels (PLs), achieving control over a broad range of design parameters (i.e. strains, deformations, ductility factors) most of which are directly estimated at the design stage using advanced analysis tools (a special type of inelastic dynamic analysis). To evaluate the efficiency of the proposed design methodology, it is applied to an actual bridge that was previously designed using a different PBD method, namely displacement-based design accounting for higher mode effects, thus enabling comparison of the alternative PBD approaches. Assessment of the proposed method using nonlinear dynamic analysis for a set of spectrum-compatible motions, indicate that it results in satisfactory performance of the bridge. Comparison with the displacement-based method reveals significant cost reduction, albeit at the expense of increased computational effort.

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“…This approach is addressed only to single-column bridge with pinned deck-abutment connections and proves a satisfactory accuracy compared to classical forcebased assessment approaches. Moreover, Cardone [4] provided performance displacement profiles corresponding to the Ultimate Limit State (ULS) of different bridge components, comprising abutments, bearings and shear keys. Advances in the issue have been also proposed accounting for soil-structure interaction [5].…”

Section: Introductionmentioning

confidence: 99%

Validation of an Analytical Displacement-Based Pushover for Multi-Span Continuous Deck Bridges

Nettis¹,

Gentile²,

Uva³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In the framework of seismic vulnerability assessment, the displacement-based analytical approaches allow the investigation of the non-linear response of structures with accuracy and low computational effort. This paper deals with a recently-proposed displacement-based analytical pushover addressed to the seismic performance assessment of multi-span continuousdeck straight bridges. The method consists in the static analysis of a simplified mechanical model for increased displacements (pseudo pushover) and allows to obtain an "adaptive" force-displacement curve. This procedure is applied to a set of 36 short bridge configurations representing typical Italian typologies (2 to 6 bays, with two deck configurations and different height of the piers). This work aims to test the method for different hazard intensities, also discussing the influence of bridge regularity in the predicted seismic performance. The accuracy of the DBA procedure is evaluated comparing it with more refined pushover and nonlinear time history analyses. Three different suites of 10 natural ground motions, scaled to different intensity levels, are adopted. The results are discussed in terms of capacity/demand checks and predicted deformed shape, proving that the DB pseudo pushover provides approximately the same level of accuracy expected for standard non-linear static analyses.

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Displacement limits and performance displacement profiles in support of direct displacement‐based seismic assessment of bridges

Cited by 44 publications

References 24 publications

Methodology for the development of bridge‐specific fragility curves

Methodology for the development of bridge‐specific fragility curves

Deformation-based seismic design of concrete bridges

Validation of an Analytical Displacement-Based Pushover for Multi-Span Continuous Deck Bridges

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